# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from __future__ import print_function import collections from collections import defaultdict from collections import Iterable import contextlib from .wrapped_decorator import signature_safe_contextmanager, wrap_decorator import os import re import traceback import six import numpy as np import subprocess import multiprocessing import sys import logging from .. import compat as cpt from .proto import framework_pb2 from . import core from . import unique_name import paddle.version as fluid_version import warnings __all__ = [ 'Program', 'default_startup_program', 'default_main_program', 'program_guard', 'name_scope', 'cuda_places', 'cpu_places', 'cuda_pinned_places', 'in_dygraph_mode', 'is_compiled_with_cuda', 'Variable', 'load_op_library', 'require_version', ] EMPTY_VAR_NAME = core.kEmptyVarName() TEMP_VAR_NAME = core.kTempVarName() GRAD_VAR_SUFFIX = core.kGradVarSuffix() ZERO_VAR_SUFFIX = core.kZeroVarSuffix() CONTROL_DEP_VAR_PREFIX = core.kControlDepVarName() _dygraph_tracer_ = None _dygraph_current_expected_place_ = None def require_version(min_version, max_version=None): """ Check if the installed version of PaddlePaddle is in [min_version, max_version], if the installed version is lower than ``min_version`` or higher than ``max_version``, an exception will be thrown, NO returns if the installed version is satisfied. Args: min_version (str): the minimum version required (like '1.4.0'). max_version (str, optional): the max version required (like '1.6.0'), default is None, meaning any version equal or higher than ``min_version`` is acceptable. Returns: None. Raises: TypeError: if the type of ``min_version`` is not str. TypeError: if the type of ``max_version`` is not str or type(None). ValueError: if the value of ``min_version`` is not in version format. ValueError: if the value of ``max_version`` is not in version format or None. Exception: if the installed version is lower than ``min_version`` or higher than ``max_version``. Examples: .. code-block:: python import paddle.fluid as fluid # any version >= 0.1.0 is acceptable. fluid.require_version('0.1.0') # if 0.1.0 <= version <= 10.0.0, it is acceptable. fluid.require_version(min_version='0.1.0', max_version='10.0.0') """ if not isinstance(min_version, str): raise TypeError( "The type of 'min_version' in require_version must be str, but received %s." % (type(min_version))) if not isinstance(max_version, (str, type(None))): raise TypeError( "The type of 'max_version' in require_version must be str or type(None), but received %s." % (type(max_version))) check_format = re.match(r'\d+(\.\d+){0,3}', min_version) if check_format is None or check_format.group() != min_version: raise ValueError( "The value of 'min_version' in require_version must be in format '\\d+(\\.\\d+){0,3}', " "like '1.5.2.0', but received %s" % min_version) if max_version is not None: check_format = re.match(r'\d+(\.\d+){0,3}', max_version) if check_format is None or check_format.group() != max_version: raise ValueError( "The value of 'max_version' in require_version must be in format '\\d+(\\.\\d+){0,3}', " "like '1.5.2.0', but received %s" % max_version) version_installed = [ fluid_version.major, fluid_version.minor, fluid_version.patch, fluid_version.rc ] zero_version = ['0', '0', '0', '0'] def version_cmp(ver_a, ver_b): for i in six.moves.range(len(ver_a)): if int(ver_a[i]) > int(ver_b[i]): return 1 elif int(ver_a[i]) < int(ver_b[i]): return -1 return 0 if version_cmp(version_installed, zero_version) == 0: if max_version is not None: warnings.warn( "PaddlePaddle version in [%s, %s] required, but %s installed. " "Maybe you are using a develop version, " "please make sure the version is good with your code." % (min_version, max_version, fluid_version.full_version)) else: warnings.warn( "PaddlePaddle version %s or higher is required, but %s installed, " "Maybe you are using a develop version, " "please make sure the version is good with your code." % (min_version, fluid_version.full_version)) return min_version_split = min_version.split('.') min_version_to_check = min_version_split + zero_version[len( min_version_split):] if max_version is not None: max_version_split = max_version.split('.') max_version_to_check = max_version_split + zero_version[len( max_version_split):] if version_cmp(version_installed, max_version_to_check) > 0 or version_cmp( version_installed, min_version_to_check) < 0: raise Exception( "VersionError: PaddlePaddle version in [%s, %s] required, but %s installed." % (min_version, max_version, fluid_version.full_version)) else: if version_cmp(version_installed, min_version_to_check) < 0: raise Exception( "VersionError: PaddlePaddle version %s or higher is required, but %s installed, " "please upgrade your PaddlePaddle to %s or other higher version." % (min_version, fluid_version.full_version, min_version)) def in_dygraph_mode(): """ This function checks whether the program runs in dynamic graph mode or not. You can turn on dynamic graph mode with :ref:`api_fluid_dygraph_guard` api. Returns: bool: Whether the program is running in dynamic graph mode. Examples: .. code-block:: python import paddle.fluid as fluid if fluid.in_dygraph_mode(): print('running in dygraph mode') else: print('not running in dygraph mode') """ return _dygraph_tracer_ is not None def _dygraph_not_support_(func): def __impl__(*args, **kwargs): assert not in_dygraph_mode( ), "We don't support %s in Dygraph mode" % func.__name__ return func(*args, **kwargs) return __impl__ def _dygraph_only_(func): def __impl__(*args, **kwargs): assert in_dygraph_mode( ), "We Only support %s in Dygraph mode, please use fluid.dygraph.guard() as context to run it in Dygraph Mode" % func.__name__ return func(*args, **kwargs) return __impl__ dygraph_not_support = wrap_decorator(_dygraph_not_support_) dygraph_only = wrap_decorator(_dygraph_only_) def _dygraph_tracer(): return _dygraph_tracer_ def _current_expected_place(): return _dygraph_current_expected_place_ def _cpu_num(): if "CPU_NUM" not in os.environ.keys(): if multiprocessing.cpu_count() > 1: sys.stderr.write( '!!! The CPU_NUM is not specified, you should set CPU_NUM in the environment variable list.\n' 'CPU_NUM indicates that how many CPUPlace are used in the current task.\n' 'And if this parameter are set as N (equal to the number of physical CPU core) the program may be faster.\n\n' 'export CPU_NUM={} # for example, set CPU_NUM as number of physical CPU core which is {}.\n\n' '!!! The default number of CPU_NUM=1.\n'.format( multiprocessing.cpu_count(), multiprocessing.cpu_count())) os.environ['CPU_NUM'] = str(1) cpu_num = os.environ.get('CPU_NUM') return int(cpu_num) def _cuda_ids(): gpus_env = os.getenv("FLAGS_selected_gpus") if gpus_env: device_ids = [int(s) for s in gpus_env.split(",")] else: device_ids = six.moves.range(core.get_cuda_device_count()) return device_ids def is_compiled_with_cuda(): """ Whether this whl package can be used to run the model on GPU. Returns (bool): support gpu or not. Examples: .. code-block:: python import paddle.fluid as fluid support_gpu = fluid.is_compiled_with_cuda() """ return core.is_compiled_with_cuda() def _var_base_to_np(var_base): """ convert VarBase tp numpy Args: var_base(VarBase) : the VarBase to convert Returns (np.ndarray): the np.ndarray contain the value of VarBase """ var = var_base._copy_to(core.CPUPlace(), True) return np.array(var.value().get_tensor()) def cuda_places(device_ids=None): """ **Note**: For multi-card tasks, please use `FLAGS_selected_gpus` environment variable to set the visible GPU device. The next version will fix the problem with `CUDA_VISIBLE_DEVICES` environment variable. This function creates a list of :code:`fluid.CUDAPlace` objects. If :code:`device_ids` is None, environment variable of :code:`FLAGS_selected_gpus` would be checked first. For example, if :code:`FLAGS_selected_gpus=0,1,2`, the returned list would be [fluid.CUDAPlace(0), fluid.CUDAPlace(1), fluid.CUDAPlace(2)]. If :code:`FLAGS_selected_gpus` is not set, all visible gpu places would be returned according to the :code:`CUDA_VISIBLE_DEVICES` environment variable. If :code:`device_ids` is not None, it should be the device ids of GPUs. For example, if :code:`device_ids=[0,1,2]`, the returned list would be [fluid.CUDAPlace(0), fluid.CUDAPlace(1), fluid.CUDAPlace(2)]. Parameters: device_ids (list or tuple of int, optional): list of GPU device ids. Returns: list of fluid.CUDAPlace: Created GPU place list. Examples: .. code-block:: python import paddle.fluid as fluid cuda_places = fluid.cuda_places() """ assert core.is_compiled_with_cuda(), \ "Not compiled with CUDA" if device_ids is None: device_ids = _cuda_ids() elif not isinstance(device_ids, (list, tuple)): device_ids = [device_ids] return [core.CUDAPlace(dev_id) for dev_id in device_ids] def cpu_places(device_count=None): """ This function creates a list of :code:`fluid.CPUPlace` objects, and returns the created list. If :code:`device_count` is None, the device count would be determined by environment variable :code:`CPU_NUM`. If :code:`CPU_NUM` is not set, the default value is 1, i.e. CPU_NUM=1. :code:`CPU_NUM` indicates the number of devices used in the current task. The running of the program can be accelerated if :code:`CPU_NUM` is the same as the number of physical cores. Parameters: device_count (int, optional): device number. Default: None. Returns: list of fluid.CPUPlace: Created list of CPU places. Examples: .. code-block:: python import paddle.fluid as fluid cpu_places = fluid.cpu_places() """ if device_count is None: device_count = _cpu_num() return [core.CPUPlace()] * device_count def cuda_pinned_places(device_count=None): """ This function creates a list of :code:`fluid.CUDAPinnedPlace` objects. If :code:`device_count` is None, the device count would be determined by environment variable :code:`CPU_NUM`. If :code:`CPU_NUM` is not set, the default value is 1, i.e. CPU_NUM=1. :code:`CPU_NUM` indicates the number of devices used in the current task. The running of the program can be accelerated if :code:`CPU_NUM` is the same as the number of physical cores. Parameters: device_count (int, optional): device number. Default: None. Returns: list of fluid.CUDAPinnedPlace: Created list of CUDA pinned places. Examples: .. code-block:: python import paddle.fluid as fluid cuda_pinned_places_cpu_num = fluid.cuda_pinned_places() # or cuda_pinned_places = fluid.cuda_pinned_places(1) """ assert core.is_compiled_with_cuda(), \ "Not compiled with CUDA" if device_count is None: device_count = len(_cuda_ids()) return [core.CUDAPinnedPlace()] * device_count class NameScope(object): def __init__(self, name="", parent=None): self._children = dict() self._name = name self._parent = parent def child(self, prefix): if prefix not in self._children: new_child = NameScope(prefix, self) self._children[prefix] = [new_child] else: new_child = NameScope(prefix + "_%d" % len(self._children[prefix]), self) self._children[prefix].append(new_child) return new_child def parent(self): return self._parent def name(self): return self._name _name_scope = NameScope() @signature_safe_contextmanager def name_scope(prefix=None): """ Generate hierarchical name prefix for the operators. Note: This should only used for debugging and visualization purpose. Don't use it for serious analysis such as graph/program transformations. Args: prefix(str, optional): prefix. Default is none. Examples: .. code-block:: python import paddle.fluid as fluid with fluid.name_scope("s1"): a = fluid.data(name='data', shape=[None, 1], dtype='int32') b = a + 1 with fluid.name_scope("s2"): c = b * 1 with fluid.name_scope("s3"): d = c / 1 with fluid.name_scope("s1"): f = fluid.layers.pow(d, 2.0) with fluid.name_scope("s4"): g = f - 1 # Op are created in the default main program. for op in fluid.default_main_program().block(0).ops: # elementwise_add is created in /s1/ if op.type == 'elementwise_add': assert op.desc.attr("op_namescope") == '/s1/' # elementwise_mul is created in '/s1/s2' elif op.type == 'elementwise_mul': assert op.desc.attr("op_namescope") == '/s1/s2/' # elementwise_div is created in '/s1/s3' elif op.type == 'elementwise_div': assert op.desc.attr("op_namescope") == '/s1/s3/' # elementwise_sum is created in '/s4' elif op.type == 'elementwise_sub': assert op.desc.attr("op_namescope") == '/s4/' # pow is created in /s1_1/ elif op.type == 'pow': assert op.desc.attr("op_namescope") == '/s1_1/' """ # TODO(panyx0718): Only [0-9a-z]. # in dygraph we don't need namescope since it will cause mem leak if not in_dygraph_mode(): assert prefix, "namescope prefix cannot be empty." global _name_scope _name_scope = _name_scope.child(prefix) yield _name_scope = _name_scope.parent() else: yield def _full_name_scope(): global _name_scope scope = _name_scope name = "" while scope: name = scope.name() + "/" + name scope = scope.parent() return name def generate_control_dev_var_name(): import random return CONTROL_DEP_VAR_PREFIX + "@" + str(random.random()) def grad_var_name(var_name): """ Returns: str: gradient name for a certain var name """ return var_name + GRAD_VAR_SUFFIX def convert_np_dtype_to_dtype_(np_dtype): """ Convert the data type in numpy to the data type in Paddle Args: np_dtype(np.dtype): the data type in numpy. Returns: core.VarDesc.VarType: the data type in Paddle. """ dtype = np.dtype(np_dtype) if dtype == np.float32: return core.VarDesc.VarType.FP32 elif dtype == np.float64: return core.VarDesc.VarType.FP64 elif dtype == np.float16: return core.VarDesc.VarType.FP16 elif dtype == np.int32: return core.VarDesc.VarType.INT32 elif dtype == np.int16: return core.VarDesc.VarType.INT16 elif dtype == np.int64: return core.VarDesc.VarType.INT64 elif dtype == np.bool: return core.VarDesc.VarType.BOOL elif dtype == np.uint16: return core.VarDesc.VarType.INT16 elif dtype == np.uint8: return core.VarDesc.VarType.UINT8 elif dtype == np.int8: return core.VarDesc.VarType.INT8 else: raise ValueError("Not supported numpy dtype %s" % dtype) def dtype_is_floating(dtype): """ Check the data type is floating or not. Args: dtype(np.dtype|core.VarDesc.VarType): data type. Could be numpy format or Paddle format Returns(bool): True if data type is a float value """ if not isinstance(dtype, core.VarDesc.VarType): dtype = convert_np_dtype_to_dtype_(dtype) return dtype in [ core.VarDesc.VarType.FP16, core.VarDesc.VarType.FP32, core.VarDesc.VarType.FP64 ] def _debug_string_(proto, throw_on_error=True): """ Get the debug string of a protobuf message. The message could be not initialized. Args: proto(google.protobuf.message.Message): The protobuf message throw_on_error(bool): True if raise an error when the protobuf message is not initialized. Returns(str): The debug string of the protobuf message """ error_fields = list() if not proto.IsInitialized(error_fields) and throw_on_error: raise ValueError("{0} are not initialized.\nThe message is {1}:\n". format(error_fields, proto)) return proto.__str__() class Variable(object): """ **Notes**: **The constructor of Variable should not be invoked directly.** **In Static Graph Mode: Please use** `Block.create_var` **to create a Static variable which has no data until being feed.** **In Dygraph Mode: Please use** :ref:`api_fluid_dygraph_to_variable` **to create a dygraph variable with real data** In Fluid, every input and output of an OP is a variable. In most cases, variables are used for holding different kinds of data or training labels. A variable belongs to a :ref:`api_guide_Block_en` . All variable has its own name and two variables in different :ref:`api_guide_Block_en` could have the same name. There are many kinds of variables. Each kind of them has its own attributes and usages. Please refer to the `framework.proto `_ for details. Most of a Variable's member variables can be setted to be None. It mean it is not available or will be specified later. Examples: In Static Graph Mode: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') In `Dygraph <../../user_guides/howto/dygraph/DyGraph.html>`_ Mode: .. code-block:: python import paddle.fluid as fluid import numpy as np with fluid.dygraph.guard(): new_variable = fluid.dygraph.to_variable(np.arange(10)) """ def __init__(self, block, type=core.VarDesc.VarType.LOD_TENSOR, name=None, shape=None, dtype=None, lod_level=None, capacity=None, persistable=None, error_clip=None, stop_gradient=False, is_data=False, need_check_feed=False, belong_to_optimizer=False, **kwargs): self.block = block if name is None: name = unique_name.generate('_generated_var') if dtype is not None: if not isinstance(dtype, core.VarDesc.VarType): dtype = convert_np_dtype_to_dtype_(dtype) self.belong_to_optimizer = belong_to_optimizer if in_dygraph_mode(): # record vars in tracer rather than blocks self._ivar = kwargs.get("ivar", None) self.stop_gradient_ = kwargs.get("stop_gradient", True) if not self._ivar: self._ivar = core.VarBase( name, type if type else core.VarDesc.VarType.LOD_TENSOR, dtype if dtype else core.VarDesc.VarType.FP32, list(shape) if shape else [], True if persistable else False) if persistable: _dygraph_tracer().trace_var(name, self) self.op = None else: self.error_clip = error_clip is_new_var = False name = cpt.to_text(name) self.desc = self.block.desc.find_var(cpt.to_bytes(name)) if self.desc is None: self.desc = self.block.desc.var(cpt.to_bytes(name)) is_new_var = True if is_new_var: self.desc.set_type(type) elif self.desc.type() != type: raise ValueError( "Variable {0} has been created before. The " "previous type is {1}; the new type is {2}. They" " are not matched".format(self.name, self.desc.type(), type)) if shape is not None: if is_new_var: self.desc.set_shape(shape) else: old_shape = self.shape shape = tuple(shape) if shape != old_shape: raise ValueError( "Variable {0} has been created before. the previous " "shape is {1}; the new shape is {2}. They are not " "matched.".format(self.name, old_shape, shape)) if dtype is not None: if is_new_var: self.desc.set_dtype(dtype) else: old_dtype = self.dtype if dtype != old_dtype: raise ValueError( "Variable {0} has been created before. " "The previous data type is {1}; the new " "data type is {2}. They are not " "matched.".format(self.name, old_dtype, dtype)) if lod_level is not None: if is_new_var: self.desc.set_lod_level(lod_level) else: if lod_level != self.lod_level: raise ValueError( "Variable {0} has been created before. " "The previous lod_level is {1}; the new " "lod_level is {2}. They are not " "matched".format(self.name, self.lod_level, lod_level)) if persistable is not None: if is_new_var: self.desc.set_persistable(persistable) else: if persistable != self.persistable: raise ValueError( "Variable {0} has been created before." "The previous persistable is {1}; the new " "persistable is {2}. They are not matched".format( self.name, self.persistable, persistable)) if need_check_feed and is_new_var: self.desc.set_need_check_feed(need_check_feed) if capacity is not None: if is_new_var: self.desc.set_capacity(capacity) else: # TODO(abhinavarora) : Compare with set capacity once, # get_capacity is implemented pass self.block.vars[name] = self self.op = None self._stop_gradient = stop_gradient self.is_data = is_data @dygraph_only def detach(self): """ **Notes**: **This API is ONLY avaliable in Dygraph mode** Returns a new Variable, detached from the current graph. Returns: ( :ref:`api_guide_Variable_en` | dtype is same as current Variable): The detached Variable. Examples: .. code-block:: python import paddle.fluid as fluid from paddle.fluid.dygraph.base import to_variable from paddle.fluid.dygraph import FC import numpy as np data = np.random.uniform(-1, 1, [30, 10, 32]).astype('float32') with fluid.dygraph.guard(): fc = FC("fc", 64, num_flatten_dims=2) data = to_variable(data) x = fc(data) y = x.detach() """ if in_dygraph_mode(): new_var = self._cloneVar() self.block.append_op( type="assign", inputs={'X': [self]}, outputs={'Out': [new_var]}, stop_gradient=True) return new_var else: raise AttributeError("static graph model DO NOT supprt detach") @dygraph_only def numpy(self): """ **Notes**: **This API is ONLY avaliable in Dygraph mode** Returns a numpy array shows the value of current :ref:`api_guide_Variable_en` Returns: ndarray: The numpy value of current Variable. Returns type: ndarray: dtype is same as current Variable Examples: .. code-block:: python import paddle.fluid as fluid from paddle.fluid.dygraph.base import to_variable from paddle.fluid.dygraph import FC import numpy as np data = np.random.uniform(-1, 1, [30, 10, 32]).astype('float32') with fluid.dygraph.guard(): fc = FC("fc", 64, num_flatten_dims=2) data = to_variable(data) x = fc(data) print(x.numpy()) """ if not self._ivar.value().get_tensor()._is_initialized(): raise ValueError("%s is Empty, Please check if it has no data in" % self.name) new_ivar = self._ivar._copy_to(core.CPUPlace(), True) return np.array(new_ivar.value().get_tensor()) @dygraph_only def set_value(self, value): """ **Notes**: **This API is ONLY avaliable in Dygraph mode** Set a new value for this Variable. Args: value (Variable|np.ndarray): the new value. Examples: .. code-block:: python import paddle.fluid as fluid from paddle.fluid.dygraph.base import to_variable from paddle.fluid.dygraph import FC import numpy as np data = np.ones([3, 32, 32], dtype='float32') with fluid.dygraph.guard(): fc = fluid.dygraph.FC("fc", 4) t = to_variable(data) fc(t) # call with default weight custom_weight = np.random.randn(1024, 4).astype("float32") fc.weight.set_value(custom_weight) # change existing weight out = fc(t) # call with different weight """ assert isinstance(value, (Variable, np.ndarray, core.VarBase)), \ "Variable set_value function, arguments type only support Variable, numpy, VarBase" value_np = value if isinstance(value, Variable): value_np = value.numpy() elif isinstance(value, core.VarBase): value_np = _var_base_to_np(value) self_tensor = self._ivar.value().get_tensor() self_tensor_np = np.array(self_tensor) assert self_tensor_np.shape == value_np.shape, \ "Variable Shape not match, Variable [ {} ] need tensor with shape {} but load set tensor with shape {}".format( self._ivar.name, self_tensor_np.shape, value_np.shape) assert self_tensor_np.dtype == value_np.dtype, \ "Variable dtype not match, Variable [ {} ] need tensor with dtype {} but load tensor with dtype {}".format( self._ivar.name, self_tensor_np.dtype, value_np.dtype) self_tensor.set(value_np, _current_expected_place()) @dygraph_only def backward(self, backward_strategy=None): """ **Notes**: **This API is ONLY avaliable in Dygraph mode** Run backward of current Graph which starts from current Variable Args: backward_strategy( :ref:`api_fluid_dygraph_BackwardStrategy` ): The Backward Strategy to run backward Returns: NoneType: None Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np x = np.ones([2, 2], np.float32) with fluid.dygraph.guard(): inputs2 = [] for _ in range(10): tmp = fluid.dygraph.base.to_variable(x) # if we don't set tmp's stop_gradient as False then, all path to loss will has no gradient since # there is no one need gradient on it. tmp.stop_gradient=False inputs2.append(tmp) ret2 = fluid.layers.sums(inputs2) loss2 = fluid.layers.reduce_sum(ret2) backward_strategy = fluid.dygraph.BackwardStrategy() backward_strategy.sort_sum_gradient = True loss2.backward(backward_strategy) """ if in_dygraph_mode(): from .dygraph import BackwardStrategy if backward_strategy is None: backward_strategy = BackwardStrategy() backward_strategy.sort_sum_gradient = False self._ivar._run_backward(backward_strategy, _dygraph_tracer()) else: raise ValueError( "Variable.backward() is only avaliable in DyGraph mode") @dygraph_only def gradient(self): """ **Notes**: **This API is ONLY avaliable in Dygraph mode** Get the Gradient of Current Variable Returns: ndarray: Numpy value of the gradient of current Variable Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np x = np.ones([2, 2], np.float32) with fluid.dygraph.guard(): inputs2 = [] for _ in range(10): tmp = fluid.dygraph.base.to_variable(x) tmp.stop_gradient=False inputs2.append(tmp) ret2 = fluid.layers.sums(inputs2) loss2 = fluid.layers.reduce_sum(ret2) backward_strategy = fluid.dygraph.BackwardStrategy() backward_strategy.sort_sum_gradient = True loss2.backward(backward_strategy) print(loss2.gradient()) """ if self._ivar._grad_ivar() is None: raise ValueError("%s has no grad, Please set Variable.stop_gradient=False, or " \ "check if this is the first and only variable need grad, if so, please set its pre-Variable's " \ "stop_gradient=False, to make sure it has gradient " % self.name) if not self._ivar._grad_ivar().value().get_tensor()._is_initialized(): raise ValueError( "%s's Grad is Empty, Please check if it has no data in" % self.name) new_ivar = self._ivar._grad_ivar()._copy_to(core.CPUPlace(), True) return np.array(new_ivar.value().get_tensor()) @dygraph_only def clear_gradient(self): """ **Notes**: **1. This API is ONLY avaliable in Dygraph mode** **2. Use it only Variable has gradient, normally we use this for Parameters since other temporal Variable will be deleted by Python's GC** Clear (set to ``0`` ) the Gradient of Current Variable Returns: None Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np x = np.ones([2, 2], np.float32) with fluid.dygraph.guard(): inputs2 = [] for _ in range(10): tmp = fluid.dygraph.base.to_variable(x) tmp.stop_gradient=False inputs2.append(tmp) ret2 = fluid.layers.sums(inputs2) loss2 = fluid.layers.reduce_sum(ret2) backward_strategy = fluid.dygraph.BackwardStrategy() backward_strategy.sort_sum_gradient = True loss2.backward(backward_strategy) print(loss2.gradient()) loss2.clear_gradient() print("After clear {}".format(loss2.gradient())) """ self._ivar._clear_gradient() def __str__(self): return self.to_string(True) def to_string(self, throw_on_error, with_details=False): """ Get debug string. Args: throw_on_error (bool): True if raise an exception when self is not initialized. with_details (bool): more details about variables and parameters (e.g. trainable, optimize_attr, ...) will be printed when with_details is True. Default value is False; Returns: str: The debug string. Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print(new_variable.to_string(True)) print("=============with detail===============") print(new_variable.to_string(True, True)) """ if in_dygraph_mode(): # TODO(panyx0718): add more dygraph debug info. tensor = self._ivar.value().get_tensor() if tensor._is_initialized(): return 'name %s, dtype: %s shape: %s %s' % ( self.name, self.dtype, self.shape, str(tensor)) else: return 'name %s, shape: %s, not inited' % (self.name, self.shape) assert isinstance(throw_on_error, bool) and isinstance(with_details, bool) protostr = self.desc.serialize_to_string() proto = framework_pb2.VarDesc.FromString(six.binary_type(protostr)) res_str = _debug_string_(proto, throw_on_error) if with_details: additional_attr = ("error_clip", "stop_gradient") for attr_name in additional_attr: res_str += "%s: %s\n" % (attr_name, cpt.to_text(getattr(self, attr_name))) return res_str __repr__ = __str__ @property def stop_gradient(self): """ Indicating if we stop gradient from current Variable **Notes: This Property has default value as** ``True`` **in** `Dygraph <../../user_guides/howto/dygraph/DyGraph.html>`_ **mode, while Parameter's default value is False. However, in Static Graph Mode all Variable's default stop_gradient value is** ``False`` Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np with fluid.dygraph.guard(): value0 = np.arange(26).reshape(2, 13).astype("float32") value1 = np.arange(6).reshape(2, 3).astype("float32") value2 = np.arange(10).reshape(2, 5).astype("float32") fc = fluid.FC("fc1", size=5, dtype="float32") fc2 = fluid.FC("fc2", size=3, dtype="float32") a = fluid.dygraph.to_variable(value0) b = fluid.dygraph.to_variable(value1) c = fluid.dygraph.to_variable(value2) out1 = fc(a) out2 = fc2(b) out1.stop_gradient = True out = fluid.layers.concat(input=[out1, out2, c], axis=1) out.backward() assert (fc._w.gradient() == 0).all() assert (out1.gradient() == 0).all() """ if in_dygraph_mode(): return self._ivar.stop_gradient else: return self._stop_gradient @stop_gradient.setter def stop_gradient(self, s): if in_dygraph_mode(): self._ivar.stop_gradient = s else: self._stop_gradient = s @property def persistable(self): """ Indicating if we current Variable should be long-term alive **Notes: This Property will be deprecated and this API is just to help user understand concept** **1. All Variable's persistable is** ``False`` **except Parameters.** **2. In** `Dygraph <../../user_guides/howto/dygraph/DyGraph.html>`_ **mode, this property should not be changed** Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("persistable of current Var is: {}".format(new_variable.persistable)) """ if in_dygraph_mode(): return self._ivar.persistable else: return self.desc.persistable() @persistable.setter def persistable(self, p): if in_dygraph_mode(): logging.warn( "There will be no use to set persistable in Dygraph Mode, since " "you can just do it by hold it as normal Python variable") else: self.desc.set_persistable(p) @property def name(self): """ Indicating name of current Variable **Notes: If it has two or more Varaible share the same name in the same** :ref:`api_guide_Block_en` **, it means these Variable will share content in no-** `Dygraph <../../user_guides/howto/dygraph/DyGraph.html>`_ **mode. This is how we achieve Parameter sharing** Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("name of current Var is: {}".format(new_variable.name)) """ if in_dygraph_mode(): return self._ivar.name else: return cpt.to_text(self.desc.name()) @property def grad_name(self): """ Indicating name of the gradient Variable of current Variable. **Notes: This is a read-only property. It simply returns name of gradient Variable from a naming convention but doesn't guarantee the gradient exists.** Examples: .. code-block:: python import paddle.fluid as fluid x = fluid.data(name="x", shape=[-1, 23, 48], dtype='float32') print(x.grad_name) # output is "x@GRAD" """ return self.name + "@GRAD" @name.setter def name(self, new_name): if in_dygraph_mode(): self._ivar.name = new_name else: self.desc.set_name(new_name) @property def shape(self): """ Indicating shape of current Variable **Notes: This is a read-only property** Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("shape of current Var is: {}".format(new_variable.shape)) """ # convert to tuple, make it as same as numpy API. if in_dygraph_mode(): return self._ivar.shape else: return tuple(self.desc.shape()) @property def dtype(self): """ Indicating data type of current Variable **Notes: This is a read-only property** Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("Dtype of current Var is: {}".format(new_variable.dtype)) """ if in_dygraph_mode(): return self._ivar.dtype else: return self.desc.dtype() @property @dygraph_not_support def lod_level(self): """ Indicating ``LoD`` info of current Variable, please refer to :ref:`api_fluid_LoDTensor_en` to check the meaning of ``LoD`` **Notes**: **1. This is a read-only property** **2. Don't support this property in** `Dygraph <../../user_guides/howto/dygraph/DyGraph.html>`_ **mode, it's value should be** ``0(int)`` Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("LoD Level of current Var is: {}".format(new_variable.lod_level)) """ # TODO(minqiyang): Support lod_level in dygraph mode if in_dygraph_mode(): raise Exception("Dygraph model DO NOT supprt lod") return self.desc.lod_level() @property def type(self): """ Indicating Type of current Variable **Notes: This is a read-only property** Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() new_variable = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') print("Type of current Var is: {}".format(new_variable.type)) """ if in_dygraph_mode(): return self._ivar.type else: return self.desc.type() def _set_error_clip(self, error_clip): """ Set the error_clip. Args: error_clip(BaseErrorClipAttr) : The new error_clip. Returns: None """ self.error_clip = error_clip def _set_info(self, key, value): """ Set key-value information for this variable. Args: key(str): Key for this information. value(object): The value associated to the key. Returns: None """ if not hasattr(self, "_info"): self._info = {} self._info[key] = value def _get_info(self, key): """ Get the information of this variable corresponding to key. Args: key(str): Key for this information. Returns: object """ if hasattr(self, "_info") and key in self._info: return self._info[key] return None def _slice_indices(self, slice, length): """ Reference implementation for the slice.indices method. """ # Compute step and length as integers. step = 1 if slice.step is None else slice.step # Raise ValueError for negative length or zero step. if length < 0: raise ValueError("length should not be negative") if step == 0: raise ValueError("slice step cannot be zero") # Find lower and upper bounds for start and stop. lower = -1 if step < 0 else 0 upper = length - 1 if step < 0 else length # Compute start. if slice.start is None: start = upper if step < 0 else lower else: start = slice.start start = max(start + length, lower) if start < 0 else min(start, upper) # Compute stop. if slice.stop is None: stop = lower if step < 0 else upper else: stop = slice.stop stop = max(stop + length, lower) if stop < 0 else min(stop, upper) return start, stop, step def _detectEllipsis(self, item): has_ellipsis = False start = 0 end = len(self.shape) for index, o in enumerate(item): if o is Ellipsis: if has_ellipsis: raise ValueError("Index can have one ellipsis only.") has_ellipsis = True start = index else: if has_ellipsis: end = index return has_ellipsis, start, end def _reconstructSliceinfo(self, item): has_ellipsis, start, end = self._detectEllipsis(item) if has_ellipsis: newitem = [] for i in range(start): newitem.append(item[i]) for i in range(start, end): newitem.append(slice(None, None, None)) for i in range(end, len(item)): newitem.append(item[i]) return newitem else: return None def _detectContinuesSlice(self, item): starts = [] ends = [] for index, o in enumerate(item): if isinstance(o, int): start = int(o) if (index > 0 and index >= self.shape[index]) \ or (index < 0 and (index + self.shape[index]) < 0): raise IndexError("invalid index") start = max(start + self.shape[index], 0) if start < 0 else min( start, self.shape[index]) starts.append(start) ends.append(start + 1) elif isinstance(o, slice): start, stop, step = self._slice_indices(o, self.shape[index]) if step == 1 or step == -1: starts.append(start) ends.append(stop) else: return False, None else: raise IndexError("Valid index accept int or slice or ellipsis") return True, [starts, ends] def _cloneVar(self, copy=False): if not copy: return self.block.create_var( name=unique_name.generate_with_ignorable_key(self.name), dtype=self.dtype) else: return self def _sliceVar(self, axes, starts, ends): new_var = self._cloneVar() self.block.append_op( type="slice", inputs={'Input': [self]}, outputs={'Out': [new_var]}, attrs={'axes': axes, 'starts': starts, 'ends': ends}) return new_var def _concatVar(self, inputs, axis): new_var = self._cloneVar() self.block.append_op( type="concat", inputs={'X': inputs}, outputs={'Out': [new_var]}, attrs={'axis': axis, }) return new_var def _sliceAndConcatVar(self, item, axis): if isinstance(item, slice): if self.shape[axis] < 0: return self._cloneVar(True) start, stop, step = self._slice_indices(item, self.shape[axis]) if step == 1: return self._sliceVar([axis], [start], [stop]) else: vars = [] if step > 0: while start < stop: vars.append( self._sliceVar([axis], [start], [start + 1])) start += step else: while start > stop: vars.append( self._sliceVar([axis], [start], [start + 1])) start += step return self._concatVar(vars, axis) elif isinstance(item, int): if self.shape[axis] < 0: return self._cloneVar(True) index = int(item) if (index > 0 and index >= self.shape[axis]) \ or (index < 0 and (index + self.shape[axis]) < 0): raise IndexError("invalid index") return self._sliceVar([axis], [index], [index + 1]) else: raise IndexError("Valid index accept int or slice or tuple") def __getitem__(self, item): """ Slice the variable. Args: item(int/slice/tuple) : the index. Returns: Sliced variable """ if not isinstance(item, tuple): item = [item] decrease_axis = [] slice_axis = [] slice_start = [] slice_end = [] slice_step = [] use_strided_slice = False reverse_axis = [] def fill_constant(shape, value, force_cpu=False, out=None): self.block.append_op( type='fill_constant', inputs={}, outputs={'Out': [out]}, attrs={ 'shape': shape, 'dtype': out.dtype, 'value': float(value), 'force_cpu': force_cpu }, stop_gradient=True) out.stop_gradient = True return out for dim, slice_item in enumerate(item): if isinstance(slice_item, slice): start = slice_item.start end = slice_item.stop step = slice_item.step if start is None and end is None and step is None: continue if step is None: step = 1 if start is None and end is None: assert (step == -1) reverse_axis.append(dim) continue if start is None: start = 0 if end is None: end = 10000000 if step != 1: use_strided_slice = True slice_axis.append(dim) slice_start.append(start) slice_end.append(end) slice_step.append(step) else: decrease_axis.append(dim) slice_axis.append(dim) slice_start.append(slice_item) slice_step.append(1) if isinstance(slice_item, Variable): temp_1 = self.block.create_var(dtype='int32') fill_constant([1], 1, force_cpu=True, out=temp_1) temp_end = self.block.create_var(dtype='int32') self.block.append_op( type='elementwise_add', inputs={'X': slice_item, 'Y': temp_1}, outputs={'Out': temp_end}, attrs={'axis': -1}) slice_end.append(temp_end) else: slice_end.append(slice_item + 1 if slice_item != -1 else 10000000) def contain_var(one_list): for ele in one_list: if isinstance(ele, Variable): return True return False def get_new_list_tensor(old_list): new_list_tensor = [] for dim in old_list: if isinstance(dim, Variable): dim.stop_gradient = True new_list_tensor.append(dim) else: assert (isinstance(dim, int)) temp_out = self.block.create_var(dtype='int32') fill_constant([1], dim, force_cpu=True, out=temp_out) new_list_tensor.append(temp_out) return new_list_tensor inputs = {'Input': [self]} attrs = { 'axes': slice_axis, 'starts': [], 'ends': [], 'decrease_axis': decrease_axis } if (use_strided_slice == True): attrs['strides'] = [] infer_flags = list(1 for i in range(len(slice_axis))) # starts if not contain_var(slice_start): attrs['starts'] = slice_start else: inputs['StartsTensorList'] = get_new_list_tensor(slice_start) for i, dim in enumerate(slice_start): if isinstance(dim, Variable): attrs['starts'].append(-1) infer_flags[i] = -1 else: attrs['starts'].append(dim) # ends if not contain_var(slice_end): attrs['ends'] = slice_end else: inputs['EndsTensorList'] = get_new_list_tensor(slice_end) for i, dim in enumerate(slice_end): if isinstance(dim, Variable): attrs['ends'].append(-1) infer_flags[i] = -1 else: attrs['ends'].append(dim) # strides if use_strided_slice == True: if not contain_var(slice_step): attrs['strides'] = slice_step else: inputs['StridesTensorList'] = get_new_list_tensor(slice_step) for i, dim in enumerate(slice_step): if isinstance(dim, Variable): attrs['strides'].append(-1) infer_flags[i] = -1 else: attrs['strides'].append(dim) # infer_flags attrs['infer_flags'] = infer_flags out = self if use_strided_slice == False and len(slice_axis) > 0: # append slice_op here slice_out_var = self.block.create_var( name=unique_name.generate_with_ignorable_key(self.name + "_slice"), dtype=self.dtype) self.block.append_op( type="slice", inputs=inputs, outputs={'Out': [slice_out_var]}, attrs=attrs) out = slice_out_var elif use_strided_slice == True and len(slice_axis) > 0: strided_slice_out_var = self.block.create_var( name=unique_name.generate_with_ignorable_key(self.name + "_strided_slice"), dtype=self.dtype) self.block.append_op( type="strided_slice", inputs=inputs, outputs={'Out': [strided_slice_out_var]}, attrs=attrs) out = strided_slice_out_var if len(reverse_axis) > 0: reverse_out_var = self.block.create_var( name=unique_name.generate_with_ignorable_key(self.name + "_slice_reverse"), dtype=self.dtype) self.block.append_op( type="reverse", inputs={'X': out}, outputs={'Out': [reverse_out_var]}, attrs={'axis': reverse_axis}) out = reverse_out_var return out def get_all_op_protos(): """ Get all registered op proto from PaddlePaddle C++ end. Returns: list: list of OpProto. """ protostrs = core.get_all_op_protos() ret_values = [] for pbstr in protostrs: op_proto = framework_pb2.OpProto.FromString(six.binary_type(pbstr)) ret_values.append(op_proto) return ret_values class OpProtoHolder(object): """ A global variable to hold all OpProtos from C++ as a map """ @classmethod def instance(cls): if not hasattr(cls, '_instance'): cls._instance = cls() return cls._instance def __init__(self): assert not hasattr( self.__class__, '_instance'), 'Please use `instance()` to get OpProtoHolder object!' op_protos = get_all_op_protos() self.op_proto_map = {} for proto in op_protos: self.op_proto_map[proto.type] = proto def get_op_proto(self, type): """ Get OpProto by a type string. Args: type(str): The type that operator registered in C++ side. Returns(framework_pb2.OpProto): The OpProto """ if type not in self.op_proto_map: raise ValueError("Operator \"%s\" has not been registered." % type) return self.op_proto_map[type] def update_op_proto(self): op_protos = get_all_op_protos() for proto in op_protos: if proto.type not in self.op_proto_map: self.op_proto_map[proto.type] = proto @staticmethod def generated_op_attr_names(): return { core.op_proto_and_checker_maker.kOpRoleAttrName(), core.op_proto_and_checker_maker.kOpRoleVarAttrName(), core.op_proto_and_checker_maker.kOpNameScopeAttrName(), core.op_proto_and_checker_maker.kOpCreationCallstackAttrName() } class Operator(object): """ In Fluid, all the operation are represented by Operator, and Operator is regarded as a build in an instruction of a Block. Users can use the build in instructions to describe their neural network. Args: block(Block): The block has the current operator. desc(core.OpDesc): The protobuf description of Operator. type(str): The type of operator. Default None. inputs(dict): The input of this Operator. it is a dictionary, for every element, key is the input parameter name, and value is a list of variables. Default None. outputs(dict): The output of this Operator. it is a dictionary, for every element, key is the input parameter name, and value is a list of variables. Default None. attrs(dict): The attributes of this Operator. it is a dictionary, for every element, key is attribute name, and value is the attribute value. The attribute type should be as same as the type registered in C++ side. Default None. Returns: Operator: The initialized Operator. Raises: ValueError: If the passed input, output and attrs doesn't match the initializing Operator's that registered in C++ side. Notes: The constructor of operator should not be invoked directly. Use Block.append_op or Block._prepend_op instead. Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() # var1 += var2 + var3 cur_block.append_op(type="sum", inputs={"X": [var1, var2, var3]}, outputs={"Out": [var1]}) """ OP_WITHOUT_KERNEL_SET = { 'feed', 'fetch', 'recurrent', 'go', 'rnn_memory_helper_grad', 'conditional_block', 'while', 'send', 'recv', 'listen_and_serv', 'fl_listen_and_serv', 'ncclInit', 'select', 'checkpoint_notify', 'gen_nccl_id', 'c_gen_nccl_id', 'c_comm_init', 'c_sync_calc_stream', 'c_sync_comm_stream' } def __init__(self, block, desc, type=None, inputs=None, outputs=None, attrs=None): if in_dygraph_mode(): if type is None: raise ValueError( "`type` to initialized an Operator can not be None.") self._type = type self.attrs = attrs if attrs else {} else: self.block = block self.desc = desc # note: not add self.attrs here: # https://github.com/PaddlePaddle/Paddle/pull/12583#pullrequestreview-145093173 op_attrs = attrs if op_attrs is None: op_attrs = dict() del attrs op_maker = core.op_proto_and_checker_maker if op_maker.kOpRoleAttrName() not in op_attrs: op_attrs[op_maker.kOpRoleAttrName( )] = self.block.program._op_role role_var_name = op_maker.kOpRoleVarAttrName() if len(self.block.program. _op_role_var) != 0 and role_var_name not in op_attrs: op_attrs[role_var_name] = self.block.program._op_role_var if role_var_name in op_attrs and len(op_attrs[role_var_name]) == 0: del op_attrs[role_var_name] if len(self.desc.type()) != 0: return if type is None: raise ValueError( "`type` to initialized an Operator can not be None.") else: callstack_var_name = op_maker.kOpCreationCallstackAttrName() op_attrs[callstack_var_name] = list( reversed(traceback.format_stack()))[1:] self.desc.set_type(type) proto = OpProtoHolder.instance().get_op_proto(type) namescope_var_name = op_maker.kOpNameScopeAttrName() op_attrs[namescope_var_name] = _full_name_scope() def find_name(var_list, name): for var_name in var_list: if var_list[var_name] is not None and var_name == name: return True return False if inputs is not None: for in_proto in proto.inputs: found = find_name(inputs, in_proto.name) assert found or in_proto.dispensable, "Input {} not found".format( in_proto.name) if found: in_args = inputs[in_proto.name] if not isinstance(in_args, list): in_args = [in_args] if not in_proto.duplicable and len(in_args) > 1: raise ValueError( "Input %s expects only one input, but %d are given." % (in_proto.name, len(in_args))) in_arg_names = [] for index, arg in enumerate(in_args): if isinstance(arg, six.string_types): in_arg_names.append(arg) elif isinstance(arg, six.binary_type): in_arg_names.append(arg.decode()) elif isinstance(arg, Variable): in_arg_names.append(cpt.to_text(arg.name)) else: raise TypeError( "The type of '%s' in operator %s should be " "one of [basestring(), str, Varibale] in python2, " "or one of [str, bytes, Variable] in python3." "but received : " % (in_proto.name, type), arg) self.desc.set_input(in_proto.name, in_arg_names) else: self.desc.set_input(in_proto.name, []) if outputs is not None: for m in proto.outputs: if (m.name not in outputs) and m.dispensable: continue if not ((m.name in outputs) or m.dispensable): raise ValueError(("Incorrect setting for output(s) of " "operator \"%s\", should set: [%s].") % (type, m.name)) for out_proto in proto.outputs: if out_proto.name not in outputs: continue out_args = outputs[out_proto.name] if not isinstance(out_args, list): out_args = [out_args] if not out_proto.duplicable and len(out_args) > 1: raise ValueError( "Output %s expects only one output, but %d are given." % (out_proto.name, len(out_args))) out_arg_names = [] for arg in out_args: out_arg_names.append(cpt.to_text(arg.name)) # TODO(minqiyang): could we remove variable's op in static mode? if not in_dygraph_mode(): arg.op = self self.desc.set_output(out_proto.name, out_arg_names) if op_attrs is not None: if not isinstance(op_attrs, dict): raise TypeError("'attrs' should be a dict.") for attr in proto.attrs: attr_name = attr.name if (attr_name not in op_attrs) or ( op_attrs[attr_name] is None): continue attr_val = op_attrs[attr_name] self._update_desc_attr(attr_name, attr_val) self.desc.check_attrs() if self._has_kernel(type): self.desc.infer_var_type(self.block.desc) self.desc.infer_shape(self.block.desc) def _has_kernel(self, op_type): return op_type not in self.OP_WITHOUT_KERNEL_SET def to_string(self, throw_on_error): """ Get debug string. Args: throw_on_error(bool): Whether to raise exception if self is not initialized. Returns: str: The debug string. """ protostr = self.desc.serialize_to_string() proto = framework_pb2.OpDesc.FromString(six.binary_type(protostr)) return _debug_string_(proto, throw_on_error) def __str__(self): return self.to_string(True) __repr__ = __str__ @property def type(self): if in_dygraph_mode(): return self._type else: return self.desc.type() def input(self, name): """ Get the input arguments according to the input parameter name. Args: name(str): The input parameter name. Returns: list: return the list of argument names that associated with \ the specific parameter name. """ return self.desc.input(name) def _rename_input(self, old_name, new_name): """ Rename the `old_name` to `new_name`. Args: old_name(str): The old name of the Operator's input. new_name(str): The new name of the Operator's input. Returns: None """ self.desc._rename_input(old_name, new_name) def _rename_output(self, old_name, new_name): """ Rename the `old_name` to `new_name`. Args: old_name(str): The old name of the Operator's output. new_name(str): The new name of the Operator's output. Returns: None """ self.desc._rename_output(old_name, new_name) @property def input_names(self): return self.desc.input_names() @property def input_arg_names(self): return self.desc.input_arg_names() @property def output_arg_names(self): return self.desc.output_arg_names() def output(self, name): """ Get output arguments by the output parameter name. Args: name(str): The output parameter name. Returns: list: return the list of argument names associated with \ the specific parameter name. """ return self.desc.output(name) @property def output_names(self): return self.desc.output_names() @property def idx(self): for i, op in enumerate(self.block.ops): if op == self: return i raise ValueError( "Can't find op itself in it's block. It could be a bug of Paddle.") def has_attr(self, name): """ Whether this Operator has the attribute with name or not. Args: name(str): the attribute name. Returns: bool: True if has this attribute. """ return self.desc.has_attr(name) def attr_type(self, name): """ Get the type of attribute by attribute's name. Args: name(str): the attribute name. Returns: core.AttrType: the attribute type. """ return self.desc.attr_type(name) def _set_attr(self, name, val): """ Set the value of attribute by attribute's name. Args: name(str): the attribute name. val(bool|int|str|float|list): the value of the attribute. Raises: ValueError: If the type of value doesn't match with desc.attr_type(name). """ self._update_desc_attr(name, val) def _remove_attr(self, name): self.desc.remove_attr(name) def _update_desc_attr(self, name, val): """ Update the value of desc's attribute by attribute's name. Args: name(str): the attribute name. val(bool|int|str|float|list): the value of the attribute. Raises: ValueError: If the type of value doesn't match with desc.attr_type(name). """ if isinstance(val, Block): self.desc.set_block_attr(name, val.desc) elif isinstance(val, list) and val and all( isinstance(v, Block) for v in val): self.desc.set_blocks_attr(name, [v.desc for v in val]) elif isinstance(val, core.BlockDesc) or \ isinstance(val, core.ProgramDesc): self.desc.set_serialized_attr(name, val.serialize_to_string()) else: self.desc._set_attr(name, val) @property def attr_names(self): return self.desc.attr_names() def attr(self, name): """ Get the attribute by name. Args: name(str): the attribute name. Returns: bool|int|str|float|list: The attribute value. The return value can be any valid attribute type. """ return self.desc.attr(name) def _block_attr_id(self, name): """ Get the block attribute's id by name. Args: name(str): the attribute name. Returns: int: the block index. """ return self.desc._block_attr_id(name) def _block_attr(self, name): """ Get the block attribute by name. Args: name(str): the attribute name. Returns: block: the block attribute. """ id = self._block_attr_id(name) assert (id >= 0 and id < len(self.block.program.blocks)) return self.block.program.blocks[id] def _blocks_attr(self, name): """ Get the blocks attribute by name. Args: name(str): the attribute name. Returns: list: list of the blocks attribute. """ attrs = [] for i in self._blocks_attr_ids(name): assert (i >= 0 and i < len(self.block.program.blocks)) attrs.append(self.block.program.blocks[i]) return attrs def _blocks_attr_ids(self, name): """ Get the blocks attribute's ids by name. Args: name(str): the attribute name. Returns: list: list of the blocks ids. """ return self.desc._blocks_attr_ids(name) def all_attrs(self): """ Get the attribute dict. Returns: dict: The Operator's attribute dict, name->attr. """ attr_names = self.attr_names attr_map = {} for n in attr_names: attr_type = self.desc.attr_type(n) if attr_type == core.AttrType.BLOCK: attr_map[n] = self._block_attr(n) continue if attr_type == core.AttrType.BLOCKS: attr_map[n] = self._blocks_attr(n) continue attr_map[n] = self.attr(n) return attr_map class Block(object): """ In Fluid, a Program is consistence of multi-Block, and Block stores VarDesc and OpDesc. In a specific Block, a VarDesc have a unique name. One block could have some child blocks, and child block's name scopes should inherit the parent's so that OpDesc in child block can reference a VarDesc that is stored in the parent block. Please reference the framework.proto for details. Args: program(Program): The Program that the Block belongs to. idx(int): The block's id in the Program. Notes: The constructor of Block should not be invoked directly. Please use `Program._create_block()` to create a block. Examples: .. code-block:: python import paddle.fluid as fluid cur_program = fluid.Program() cur_block = cur_program.current_block() var = cur_block.create_var(name="X", shape=[-1, 23, 48], dtype='float32') cur_block.append_op(type="abs", inputs={"X": [var]}, outputs={"Out": [var]}) """ def __init__(self, program, idx): self.desc = program.desc.block(idx) self.vars = collections.OrderedDict() # var_name --> var self.ops = list() # operator list self.program = program self.removed_vars = collections.OrderedDict() def __str__(self): return self.to_string(True) def to_string(self, throw_on_error, with_details=False): """ Get debug string. Args: throw_on_error(bool): raise exception when self is not initialized when throw_on_error is True. with_details(bool): more details about variables and parameters (e.g. trainable, optimize_attr, ...) will be printed when with_details is True. Default False. Returns: str: The debug string. """ assert isinstance(throw_on_error, bool) and isinstance(with_details, bool) if with_details: re_add_indent = re.compile(r"\n(.)") res_str = "blocks {\n idx: %d\n parent_idx: %d" % ( self.idx, self.parent_idx) for var in list(self.vars.values()): res_str += "\n vars {\n %s }" % re_add_indent.sub( r"\n \1", var.to_string(throw_on_error, with_details)) for op in self.ops: res_str += "\n ops {\n %s }" % re_add_indent.sub( r"\n \1", op.to_string(throw_on_error)) res_str += "\n}" else: protostr = self.desc.serialize_to_string() proto = framework_pb2.BlockDesc.FromString( six.binary_type(protostr)) res_str = _debug_string_(proto, throw_on_error) return res_str __repr__ = __str__ @property def parent_idx(self): return self.desc.parent @property def forward_block_idx(self): return self.desc.get_forward_block_idx() def _set_forward_block_idx(self, idx): """ Set the forward block Idx. Args: idx(int): the block index. Returns: None """ self.desc._set_forward_block_idx(idx) @property def idx(self): return self.desc.id def var(self, name): """ Get a Variable by name from this block. Args: name(str): the Variable's name. Raises: ValueError: The If input's type is not str, or this block doesn't have a Variable with the giving name. Returns: Variable: the Variable with the giving name. """ if not isinstance(name, six.string_types): raise TypeError( "var require string as parameter, but get %s instead." % (type(name))) v = self.vars.get(name, None) if v is None: raise ValueError("var %s not in this block" % name) return v def _find_var_recursive(self, name): """ Get a Variable by name from this block recursively. Args: name(str): the Variable's name. Returns: Variable: the Variable with the giving name. Or None if not found. """ frontier = list() visited = set() frontier.append(self) prog = self.program while len(frontier) != 0: # BFS cur = frontier[0] frontier = frontier[1:] if id(cur) in visited: continue if cur.has_var(name): return cur.var(name) if cur.parent_idx != -1: frontier.append(prog.block(cur.parent_idx)) if cur.forward_block_idx != -1: frontier.append(prog.block(cur.forward_block_idx)) visited.add(id(cur)) return None def _var_recursive(self, name): """ Get a Variable by name from this block recursively. Args: name(str): the Variable's name. Raises: ValueError: this block and this parent block doesn't have a Variable with the giving name. Returns: Variable: the Variable with the giving name. """ var = self._find_var_recursive(name) if var: return var else: raise ValueError("Var {0} is not found recursively".format(name)) def all_parameters(self): return list(self.iter_parameters()) def iter_parameters(self): return (item[1] for item in six.iteritems(self.vars) if isinstance(item[1], Parameter)) def create_var(self, *args, **kwargs): var = Variable(block=self, *args, **kwargs) if 'initializer' in kwargs: kwargs['initializer'](var, self) return var def has_var(self, name): return name in self.vars def _rename_var(self, name, new_name): """ Rename variable in vars and ops' inputs and outputs Args: name(str): the name that need to be renamed. new_name(str): the name that need to rename to. Raises: ValueError: If this block doesn't have this the giving name, or the type of the var with the giving name is not Parameter or Variable. Returns: Variable: the Variable with the giving name. """ name = cpt.to_text(name) new_name = cpt.to_text(new_name) if not self.has_var(name): raise ValueError("var %s is not in current block" % name) v = self.var(name) if type(v) == Parameter: var_type = "Parameter" stop_gradient = v.stop_gradient trainable = v.trainable optimize_attr = v.optimize_attr regularizer = v.regularizer gradient_clip_attr = v.gradient_clip_attr error_clip = v.error_clip elif type(v) == Variable: var_type = "Variable" error_clip = v.error_clip stop_gradient = v.stop_gradient else: raise ValueError("unsupported var type: %s", type(v)) orig_var_type = v.type self.desc._rename_var(cpt.to_bytes(name), cpt.to_bytes(new_name)) # NOTE: v is destroyed by C++ after calling _rename_var. d = self.desc.find_var(cpt.to_bytes(new_name)) if var_type == "Parameter": var = Parameter( self, d.shape(), d.dtype(), type=orig_var_type, name=new_name, stop_gradient=stop_gradient, trainable=trainable, optimize_attr=optimize_attr, regularizer=regularizer, gradient_clip_attr=gradient_clip_attr, error_clip=error_clip) elif var_type == "Variable": var = Variable( self, type=orig_var_type, name=new_name, error_clip=error_clip, stop_gradient=stop_gradient) # rename the python side, _sync_with_cpp will only add # new vars/ops to python side. self.vars[new_name] = var del self.vars[name] self._sync_with_cpp() return var def _remove_var(self, name): self._sync_with_cpp() self.desc._remove_var(cpt.to_bytes(name)) del self.vars[name] def create_parameter(self, *args, **kwargs): global_block = self.program.global_block() param = Parameter(global_block, *args, **kwargs) if 'initializer' in kwargs: def _is_inited_by(block, var): init_ops = [] for op in block.ops: if var.name in op.output_arg_names: # In startup_program, "c_broadcast" and "c_sync_comm_stream" # are treated as initialization ops that cause error. # Think of "c_broadcast" and "c_sync_comm_stream" as a special case here. if op.type in ["c_broadcast", "c_sync_comm_stream"]: continue init_ops.append(op) return init_ops initializer = kwargs['initializer'] init_ops = _is_inited_by(global_block, param) init_ops_len = len(init_ops) if init_ops_len > 1: raise RuntimeError("param " + param.name + " is inited by multiple init ops " + str( init_ops)) elif init_ops_len == 1: #TODO already inited, do nothing, should log a warning pass else: initializer(param, self) param.stop_gradient = False return param def append_op(self, *args, **kwargs): """ Appends a new Operator according to the giving arguments. Returns: Operator: the append Operator. """ if in_dygraph_mode(): attrs = kwargs.get("attrs", {}) if _dygraph_tracer_._train_mode == False: # eval mode if ('trainable_statistics' not in attrs ) or not attrs['trainable_statistics']: attrs['is_test'] = True else: attrs['is_test'] = False type = kwargs.get("type", None) op = Operator( block=self, desc=None, type=type, inputs=None, outputs=None, attrs=attrs) # record ops in tracer rather than blocks # # TODO(minqiyang): add op stop_gradient support in static mode too. # currently, we only support stop_gradient in dygraph mode. _dygraph_tracer().trace_op(type, kwargs.get("inputs", {}), kwargs.get("outputs", {}), attrs if attrs else {}, kwargs.get("stop_gradient", False)) else: op_desc = self.desc.append_op() op = Operator( block=self, desc=op_desc, type=kwargs.get("type", None), inputs=kwargs.get("inputs", None), outputs=kwargs.get("outputs", None), attrs=kwargs.get("attrs", None)) self.ops.append(op) return op def _insert_op(self, index, *args, **kwargs): """ Insert a Operator according to the giving arguments. Args: index(int): the place that the operator to insert. Returns: Operator: the insert Operator. """ self._sync_with_cpp() op_desc = self.desc._insert_op(index) op = Operator(block=self, desc=op_desc, *args, **kwargs) self.ops.insert(index, op) return op def _remove_op(self, index): """ Remove the specific position operator. Args: index(int): the position that the operator to insert. Returns: None """ self._sync_with_cpp() self.desc._remove_op(index, index + 1) del self.ops[index] def _slice_ops(self, start, end): """ Return the Operator between start and end. Args: start(int): the start position. end(int): the end position. Returns: list: the Operators between start and end. """ return self.ops[start:end] def _prepend_op(self, *args, **kwargs): if in_dygraph_mode(): type = kwargs.get("type", None) attrs = kwargs.get("attrs", {}) op = Operator( self, None, type=type, inputs=None, outputs=None, attrs=attrs) _dygraph_tracer().trace_op(type, kwargs.get("inputs", {}), kwargs.get("outputs", {}), attrs if attrs else {}, kwargs.get("stop_gradient", False)) else: op_desc = self.desc._prepend_op() op = Operator( self, op_desc, type=kwargs.get("type", None), inputs=kwargs.get("inputs", None), outputs=kwargs.get("outputs", None), attrs=kwargs.get("attrs", None)) self.ops.insert(0, op) return op def _sync_with_cpp(self): """ Sync from the desc on the c++ end. This method is used to synchronize the c++ desc instance generated by backward. """ # sync variables from cpp for var in self.desc.all_vars(): if not self.has_var(var.name()): self.create_var(name=var.name(), desc=var, type=var.type()) # sync variables removed from c++ end for var in list(self.vars.keys()): if not self.desc.find_var(cpt.to_bytes(var)): self.vars.pop(var) # sync operators from cpp ops_in_cpp = [] for op_idx in range(0, self.desc.op_size()): ops_in_cpp.append(self.desc.op(op_idx)) if len(self.ops) != 0: first_op_in_python = self.ops[0].desc last_op_in_python = self.ops[len(self.ops) - 1].desc start_index = None end_index = None for index in range(len(ops_in_cpp)): if first_op_in_python == ops_in_cpp[index]: start_index = index if last_op_in_python == ops_in_cpp[index]: end_index = index assert start_index is not None assert end_index is not None assert start_index <= end_index else: start_index = 0 end_index = -1 # sync ops append to the head of cpp_ops for index in range((start_index - 1 - 1), -1, -1): op_desc = ops_in_cpp[index] op = Operator(self, op_desc) self.ops.insert(0, op) # sync ops append to the end of cpp_ops for index in range((end_index + 1), len(ops_in_cpp)): op_desc = ops_in_cpp[index] op = Operator(self, op_desc) self.ops.append(op) # sync ops removed from c++ end if end_index != -1 and end_index < len(self.ops): ops_in_cpp_index = 0 ops_in_python_index = 0 while ops_in_python_index < len( self.ops) and ops_in_cpp_index < len(ops_in_cpp): if self.ops[ops_in_python_index].desc != ops_in_cpp[ ops_in_cpp_index]: del self.ops[ops_in_python_index] else: ops_in_cpp_index += 1 ops_in_python_index += 1 assert len(self.ops) == len(ops_in_cpp) for index in range(len(self.ops)): assert self.ops[index].desc == ops_in_cpp[index] def _copy_param_info_from(self, other): """ Copy the information of parameters from the other block. Args: other(Block): the other block. Raises: ValueError: If type of input is not Block, or the `other` and this block is not in the same topology. Returns: None """ if not isinstance(other, Block): raise TypeError( "_copy_param_info_from should be invoked with Block") for p in other.iter_parameters(): assert isinstance(p, Parameter) v = self.vars.get(p.name, None) if v is None: raise ValueError("_copy_param_info_from should be invoked with " "same topology") assert isinstance(v, Variable) new_p = Parameter( block=self, shape=v.shape, dtype=v.dtype, type=v.type, lod_level=v.lod_level, stop_gradient=p.stop_gradient, trainable=p.trainable, optimize_attr=p.optimize_attr, regularizer=p.regularizer, gradient_clip_attr=p.gradient_clip_attr, error_clip=p.error_clip, name=v.name) self.vars[new_p.name] = new_p def _clone_variable(self, var, force_persistable=True): """ Clone a variable into current block. Args: var: the variable to be cloned. force_persistable(bool): True means setting the result variable to being persistable. False means setting the persistable the same with that of input var. default: True. Returns: Variable: the new variable cloned from 'var' in current block. """ assert isinstance(var, Variable) ret_var = None # make STEP_SCOPES var can be safely cloned. if var.type == core.VarDesc.VarType.STEP_SCOPES: ret_var = self.create_var( name=var.name, persistable=var.persistable, type=var.type) elif var.type == core.VarDesc.VarType.RAW: ret_var = self.create_var( name=var.name, persistable=var.persistable, type=var.type) elif var.type == core.VarDesc.VarType.SELECTED_ROWS: ret_var = self.create_var( name=var.name, shape=var.shape, dtype=var.dtype, type=var.type, persistable=True if force_persistable else var.persistable, is_data=var.is_data, need_check_feed=var.desc.need_check_feed()) else: ret_var = self.create_var( name=var.name, shape=var.shape, dtype=var.dtype, type=var.type, lod_level=var.lod_level, persistable=True if force_persistable else var.persistable, is_data=var.is_data, need_check_feed=var.desc.need_check_feed()) return ret_var class IrNode(object): """ Python IrNode. Beneath it is a core.Node, which is used for Ir Pass. """ def __init__(self, node): """ Construct an IrNode using core.Node. Args: node(core.Node): C++ Node. """ assert isinstance(node, core.Node), 'node must be the instance of core.Node.' self.node = node def name(self): """ Return the node name. Returns: str: node name. """ return self.node.name() def node_type(self): """ Return the node type. Returns: core.Node.Type: node type(core.Node.Type.Operation or core.Node.Type.Variable). """ return self.node.node_type() def var(self): """ Return the node variable description. Returns: core.VarDesc: node variable description. """ return self.node.var() def op(self): """ Return the node operator description. Returns: core.OpDesc: node operator description. """ return self.node.op() def id(self): """ Return the node id. Returns: int: node id. """ return self.node.id() def is_op(self): """ If the node is an operator, then return true. Returns: bool: indicate whether the node is an operator. """ return self.node.is_op() def is_var(self): """ If the node is a variable, then return true. Returns: bool: indicate whether the node is a variable. """ return self.node.is_var() def is_ctrl_var(self): """ If the node is a control dependence variable, then return true. Returns: bool: indicate whether the node is a control dependence variable. """ return self.node.is_ctrl_var() def clear_inputs(self): """ Clear the node inputs. After executing the `clear_inputs` function, the node inputs will be empty. """ self.node.clear_inputs() def remove_input_by_id(self, node_id): """ Remove a node from inputs by the given node id. Args: node_id(int): the given node id. """ self.node.remove_input(node_id) def remove_input(self, node): """ Remove a node from inputs. Args: node(IrNode): the node being removed. """ self.node.remove_input(node.node) def append_input(self, node): """ Append a node in inputs. Args: node(IrNode): the node being appended. """ self.node.append_input(node.node) def clear_outputs(self): """ Clear the node outputs. After executing the `clear_outputs` function, the node outputs will be empty. """ self.node.clear_outputs() def remove_output_by_id(self, node_id): """ Remove a node from outputs by the given node id. Args: node_id(int): the given node id. """ self.node.remove_output(node_id) def remove_output(self, node): """ Remove a node from outputs. Args: node(IrNode): the node being removed. """ self.node.remove_output(node.node) def append_output(self, node): """ Append a node in outputs. Args: node(IrNode): the node being appended. """ self.node.append_output(node.node) @property def inputs(self): """ Return the node inputs. Returns: list(IrNode): node inputs wrapped by IrNode. """ return [IrNode(n) for n in self.node.inputs] @property def outputs(self): """ Return the node outputs. Returns: list(IrNode): node outputs wrapped by IrNode. """ return [IrNode(n) for n in self.node.outputs] class IrVarNode(IrNode): """ Python IrVarNode. Beneath it is a core.Node, it inherits from IrNode. """ def __init__(self, node): """ Construct an IrVarNode using core.Node. Args: node(core.Node): C++ Node. """ assert isinstance(node, core.Node) and node.is_var(), \ 'node must be the instance of core.Node and it must be a variable node.' super(IrVarNode, self).__init__(node) self.node = node def set_shape(self, shape): """ Set the node variable shape. Args: shape(list): shape to be set. """ assert self.node.var() is not None, \ "The node variable description cannot be None." self.node.var().set_shape(shape) def persistable(self): """ If the variable node is a persistable variable, then return true. Returns: bool: indicate whether the variable is persistable. """ assert self.node.var() is not None, \ "The node variable description cannot be None." return self.node.var().persistable() def type(self): """ Return the variable type. Returns: core.VarDesc.VarType: the variable type. """ assert self.node.var() is not None, \ "The node variable description cannot be None." return self.node.var().type() def dtype(self): """ Return the variable data type. Returns: core.VarDesc.VarType: the variable data type. """ assert self.node.var() is not None, \ "The node variable description cannot be None." return self.node.var().dtype() def shape(self): """ Return the variable shape. Returns: list: the variable shape. """ assert self.node.var() is not None, \ "The node variable description cannot be None." return self.node.var().shape() @property def inputs(self): """ Return the node inputs. Returns: list(IrOpNode): node inputs wrapped by IrOpNode. """ return [IrOpNode(n) for n in self.node.inputs] @property def outputs(self): """ Return the node outputs. Returns: list(IrOpNode): node outputs wrapped by IrOpNode. """ return [IrOpNode(n) for n in self.node.outputs] class IrOpNode(IrNode): """ Python IrOpNode. Beneath it is a core.Node, it inherits from IrNode. """ def __init__(self, node): """ Construct an IrOpNode using core.Node. Args: node(core.Node): C++ Node. """ assert isinstance(node, core.Node) and node.is_op(), \ 'node must be the instance of core.Node and it must be a operator node.' super(IrOpNode, self).__init__(node) self.node = node def rename_input(self, old_input_name, new_input_name): """ Rename the input of this node. Args: old_input_name(str): the old input name. new_input_name(str): the new input name. """ assert self.node.op() is not None, \ "The node operator description cannot be None." self.node.op()._rename_input(old_input_name, new_input_name) def rename_output(self, old_output_name, new_output_name): """ Rename the output of this node. Args: old_output_name(str): the old output name. new_output_name(str): the new output name. """ assert self.node.op() is not None, \ "The node operator description cannot be None." print("op: {}, old: {}, new: {}\n".format(self.node.op().type( ), old_output_name, new_output_name)) self.node.op()._rename_output(old_output_name, new_output_name) def input(self, name): """ Get the argument name list by the parameter name for input. Args: name(str): the parameter name. Returns: list(str): the argument name list. """ assert self.node.op() is not None, \ "The node operator description cannot be None." return self.node.op().input(name) def output(self, name): """ Get the argument name list by the parameter name for output. Args: name(str): the parameter name. Returns: list(str): the argument name list. """ assert self.node.op() is not None, \ "The node operator description cannot be None." return self.node.op().output(name) def set_type(self, new_type): """ Change the operator type into new type. Args: new_type(str): new operator type to be set. """ assert self.node.op() is not None, \ "The node operator description cannot be None." return self.node.op().set_type(new_type) def set_attr(self, name, val): """ Set the value of attribute by attribute's name. Args: name(str): the attribute name. val(bool|int|str|float|list): the value of the attribute. """ self._update_desc_attr(name, val) def _update_desc_attr(self, name, val): """ Update the value of the op desc's attribute by attribute's name. """ assert self.node.op() is not None, \ "The node operator description cannot be None." desc = self.node.op() if isinstance(val, Block): desc.set_block_attr(name, val.desc) elif isinstance(val, list) and val and \ all(isinstance(v, Block) for v in val): desc.set_blocks_attr(name, [v.desc for v in val]) elif isinstance(val, core.BlockDesc) or \ isinstance(val, core.ProgramDesc): desc.set_serialized_attr(name, val.serialize_to_string()) else: desc._set_attr(name, val) def input_arg_names(self): """ Return input arguments' names of this op node. Returns: list(str): input arguments' names of this op node. """ assert self.node.op() is not None, \ "The node operator description cannot be None." return self.node.op().input_arg_names() def output_arg_names(self): """ Return output arguments' names of this op node. Returns: list(str): output arguments' names of this op node. """ assert self.node.op() is not None, \ "The node operator description cannot be None." return self.node.op().output_arg_names() @property def inputs(self): """ Return the node inputs. Returns: list(IrVarNode): node inputs wrapped by IrVarNode. """ return [IrVarNode(n) for n in self.node.inputs] @property def outputs(self): """ Return the node outputs. Returns: list(IrVarNode): node outputs wrapped by IrVarNode. """ return [IrVarNode(n) for n in self.node.outputs] class IrGraph(object): """ Python IrGraph. Beneath it is a core.Graph, which is used for creating a c++ Ir Pass Graph. An IrGraph is just a graph view of a Program. In an IrGraph, both Variables and Operators are graph nodes. """ def __init__(self, graph, for_test=False): """ Construct an IrGraph using core.Graph. Args: graph(core.Graph): C++ Graph. for_test(bool): True for the test graph and false for the train graph. """ assert isinstance( graph, core.Graph), 'graph must be the instance of core.Graph.' self.graph = graph self._for_test = for_test def clone(self): """ Create a new and duplicated IrGraph. Warns: The method only clones the graph structure, not its attributes. Returns: IrGraph: A new and duplicated graph. """ g = self.graph.clone() return IrGraph(g, self._for_test) def is_test(self): """ If the graph is used for testing, the function returns true. Otherwise, returns false. """ return self._for_test def all_nodes(self): """ Return all nodes included in the graph as a set. """ return {IrNode(node) for node in self.graph.nodes()} def all_var_nodes(self): """ Return all variable nodes included in the graph as a set. """ return {IrVarNode(node) for node in self.graph.nodes() if node.is_var()} def all_persistable_nodes(self): """ Return all persistable variable nodes included in the graph as a set. """ persistable_nodes = set() for node in self.graph.nodes(): if node.is_var() and node.var() is not None and node.var( ).persistable(): persistable_nodes.add(node) return {IrVarNode(p) for p in persistable_nodes} def all_op_nodes(self): """ Return all operator nodes included in the graph as a set. """ return {IrOpNode(node) for node in self.graph.nodes() if node.is_op()} def create_persistable_node(self, name, var_type, shape, var_dtype): """ Create a persistable variable node in the graph. In IrGraph, it can not distinguish between persistable variables and parameters. Args: name(str): the name of the persistable variable node. vart_type(core.VarDesc.VarType): the type of the persistable variable node. shape(list): the shape of the persistable variable node. var_dtype(core.VarDesc.VarType): the data type of the persistable variable node. Returns: IrVarNode: the created persistable variable node. """ var_desc = core.VarDesc(name) var_desc.set_type(var_type) var_desc.set_shape(shape) var_desc.set_dtype(var_dtype) var_desc.set_persistable(True) return IrVarNode(self.graph.create_var_node(var_desc)) def create_var_node(self, name, var_type, shape, var_dtype): """ Create a variable node in the graph. The created variable node is not persistable. Args: name(str): the name of the variable node. vart_type(core.VarDesc.VarType): the type of the variable node. shape(list): the shape of the variable node. var_dtype(core.VarDesc.VarType): the data type of the variable node. Returns: IrVarNode: the created variable node. """ var_desc = core.VarDesc(name) var_desc.set_type(var_type) var_desc.set_shape(shape) var_desc.set_dtype(var_dtype) return IrVarNode(self.graph.create_var_node(var_desc)) def create_var_node_from_desc(self, var_desc): """ Create a variable node by using an existing VarDesc in the graph. Depend on the giving VarDesc, the created variable node may be persistable. Args: var_desc(core.VarDesc): the giving variable description. Returns: IrVarNode: the created variable node. """ return IrVarNode(self.graph.create_var_node(var_desc)) def create_op_node(self, op_type, attrs, inputs, outputs): """ Create a operator node in the graph. Args: op_type(str): the type of the operator node. attrs(dict): the attributes of the operator node. inputs(dict): the inputs of the operator node. outputs(dict): the outpus of the operator node. Returns: IrOpNode: the created operator node. """ op_desc = core.OpDesc() op_desc.set_type(op_type) for attr, value in six.iteritems(attrs): self._update_desc_attr(op_desc, attr, value) for input_name, var_nodes in six.iteritems(inputs): if not isinstance(var_nodes, list): var_nodes = [var_nodes] op_desc.set_input(input_name, [var_node.name() for var_node in var_nodes]) for output_name, var_nodes in six.iteritems(outputs): if not isinstance(var_nodes, list): var_nodes = [var_nodes] op_desc.set_output(output_name, [var_node.name() for var_node in var_nodes]) return IrOpNode(self.graph.create_op_node(op_desc)) def create_op_node_from_desc(self, op_desc): """ Create a operator node by using an existing OpDesc in the graph. Args: op_desc(core.VarDesc): the giving operator description. Returns: IrOpNode: the created operator node. """ return IrOpNode(self.graph.create_op_node(op_desc)) def update_input_link(self, old_input_node, new_input_node, op_node): """ Update the input's link of a operator node. Args: old_input_node(IrNode): the old input node of the giving op_node. new_input_node(IrNode): the new input node of the giving op_node. op_node(IrOpNode): the operator node that is needed to update input's link. """ assert old_input_node.node in self.graph.nodes() and new_input_node.node in \ self.graph.nodes() and op_node.node in self.graph.nodes(), \ 'The three arguments(old_input_node&new_input_node&op_node) must be in the graph nodes.' old_input_node.remove_output(op_node) op_node.remove_input(old_input_node) new_input_node.append_output(op_node) op_node.append_input(new_input_node) op_node.rename_input(old_input_node.name(), new_input_node.name()) def update_output_link(self, old_output_node, new_output_node, op_node): """ Update the output's link of an operator node. Args: old_output_node(IrNode): the old output node of the giving op_node. new_output_node(IrNode): the new output node of the giving op_node. op_node(IrOpNode): the operator node that is needed to update input's link. """ assert old_output_node.node in self.graph.nodes() and new_output_node.node in \ self.graph.nodes() and op_node.node in self.graph.nodes(), \ 'The three arguments(old_output_node &new_output_node &op_node) must be in the graph nodes.' old_output_node.remove_input(op_node) op_node.remove_output(old_output_node) new_output_node.append_input(op_node) op_node.append_output(new_output_node) op_node.rename_output(old_output_node.name(), new_output_node.name()) def link_to(self, node_in, node_out): """ Connect two nodes. Args: node_in(IrNode): the input node. node_out(IrNode): the output node. """ assert node_in.node in self.graph.nodes() and node_out.node in self.graph.nodes(), \ 'The two arguments(node_in&node_out) must be in the graph nodes.' node_in.append_output(node_out) node_out.append_input(node_in) def safe_remove_nodes(self, remove_nodes): """ Remove nodes safely since links connected to these removed nodes are also removed. Args: remove_nodes(set): the nodes prepared to be removed. """ if not isinstance(remove_nodes, set): if isinstance(remove_nodes, Iterable): remove_nodes = set(remove_nodes) else: remove_nodes = {remove_nodes} original_nodes = {n.node for n in remove_nodes} core.graph_safe_remove_nodes(self.graph, original_nodes) def resolve_hazard(self): ordered_nodes = core.topology_sort(self.graph) var_nodes = dict() for node in ordered_nodes: if node.is_op() and node.op() is not None: for each_var_name in node.op().input_arg_names(): if each_var_name not in var_nodes: var_nodes[each_var_name] = [ self._find_node_by_name(node.inputs, each_var_name) ] for each_var_name in node.op().output_arg_names(): if each_var_name not in var_nodes: var_nodes[each_var_name] = [ self._find_node_by_name(node.outputs, each_var_name) ] else: var_nodes[each_var_name].append( self._find_node_by_name(node.outputs, each_var_name)) self.graph.resolve_hazard(var_nodes) def has_circle(self): """ Check if the graph has a circle. Returns: bool: True if the graph has a circle else False. """ return core.has_circle(self.graph) def graph_num(self): """ Count the number of unconnected graphs in this graph. Returns: int: the number of unconnected graphs. """ return core.graph_num(self.graph) def topology_sort(self): """ Perform the topology sort operation on the graph. Notes: the `graph` cannot contain a circle. Returns: list(IrNode): nodes in topology order. """ ordered_nodes = core.topology_sort(self.graph) return [IrNode(n) for n in ordered_nodes] def build_adjacency_list(self): """ Build an adjacency list of operations for the `graph`. Returns: dict{IrNode: set(IrNode)}: the adjacency list. """ adj_list = core.build_adjacency_list(self.graph) wrapped_adj_list = dict() for k, v in six.iteritems(adj_list): wrapped_adj_list[IrNode(k)] = {IrNode(n) for n in v} return wrapped_adj_list def draw(self, save_path, name, marked_nodes=None, remove_ctr_var=True): """ Draw the graph. If `dot` command is installed, the drawn graph will be saved as pdf file type, otherwise dot file type is used. Args: save_path(str): the save path of drawn graph. name(str): the name of drawn graph. marked_nodes(set(IrNode)): nodes that are needed to be marked. Default value is None. remove_ctr_var(bool): If it is set True, all control variable nodes in the graph will be removed. Default value is True. """ def _convert_to_pdf(dot_file_path): pdf_save_path = os.path.splitext(dot_file_path)[0] + '.pdf' exited_code = subprocess.call('dot -Tpdf ' + dot_file_path \ + ' -o ' + pdf_save_path, shell=True) if exited_code != 0: print('The dot command is needed for creating pdf files.') print('The {} is saved as the dot filetype.'.format( dot_file_path)) remove_ctr_vars = set() if remove_ctr_var: for node in self.all_var_nodes(): if node.is_ctrl_var(): remove_ctr_vars.add(node) self.safe_remove_nodes(remove_ctr_vars) print('Total ops num = {}.'.format(len(self.all_op_nodes()))) if marked_nodes is not None: if not isinstance(marked_nodes, set): if isinstance(marked_nodes, Iterable): marked_nodes = set(marked_nodes) else: marked_nodes = {marked_nodes} marked_nodes = {n.node for n in marked_nodes} remove_ctr_vars = {n.node for n in remove_ctr_vars} marked_nodes = marked_nodes - remove_ctr_vars if self.graph.has('__graphviz__marked_node__'): self.graph.erase('__graphviz__marked_node__') self.graph.set('__graphviz__marked_node__', marked_nodes) if not os.path.exists(save_path): os.makedirs(save_path) viz_dot_path = os.path.join(save_path, name) + '.dot' viz_pass = core.get_pass('graph_viz_pass') viz_pass.set('graph_viz_path', viz_dot_path) viz_pass.apply(self.graph) _convert_to_pdf(viz_dot_path) def to_program(self): """ Convert the graph into a Program. WARN: When the graph includes backward operator nodes, the conversion process may be failed. Usually, this function is only used to convert a test graph. Returns: Program: a program converted from the graph. """ convert_pass = core.get_pass('graph_to_program_pass') desc = core.ProgramDesc() convert_pass.set_not_owned('program', desc) convert_pass.apply(self.graph) program = Program._construct_from_desc(desc) return program def _find_node_by_name(self, nodes, node_name): """ Find a node in the giving nodes set by the name. """ target_node = None for n in nodes: if n.name() == node_name: target_node = n assert target_node is not None, "Cannot find the target node in the giving set." return target_node def _update_desc_attr(self, desc, name, val): """ Update the value of desc's attribute by attribute's name. """ if isinstance(val, Block): desc.set_block_attr(name, val.desc) elif isinstance(val, list) and val and all( isinstance(v, Block) for v in val): desc.set_blocks_attr(name, [v.desc for v in val]) elif isinstance(val, core.BlockDesc) or \ isinstance(val, core.ProgramDesc): desc.set_serialized_attr(name, val.serialize_to_string()) else: desc._set_attr(name, val) class Program(object): """ Create Python Program. It has at least one :ref:`api_guide_Block_en`, when the control flow op like conditional_block, while :ref:`api_fluid_layers_While` is included, it will contain nested block. Please reference the `framework.proto `_ for details. A set of Program usually contains startup program and main program. A startup program is set to contain some initial work, eg. initialize the ``Parameter``, and the main program will contain the network structure and vars for train. A set of Program can be used for test or train, in train program , Paddle will contain all content to build a train network, in test program Paddle will prune some content which is irrelevant to test, eg. backward ops and vars. **Notes**: **we have** :ref:`api_fluid_default_startup_program` **and** :ref:`api_fluid_default_main_program` **by default, a pair of them will shared the parameters. The** :ref:`api_fluid_default_startup_program` **only run once to initialize parameters,** :ref:`api_fluid_default_main_program` **run in every mini batch and adjust the weights.** Returns: Program: An empty Program. Examples: .. code-block:: python import paddle.fluid as fluid main_program = fluid.Program() startup_program = fluid.Program() with fluid.program_guard(main_program=main_program, startup_program=startup_program): x = fluid.layers.data(name="x", shape=[-1, 784], dtype='float32') y = fluid.layers.data(name="y", shape=[-1, 1], dtype='int32') z = fluid.layers.fc(name="fc", input=x, size=10, act="relu") print("main program is: {}".format(main_program)) print("start up program is: {}".format(startup_program)) """ def __init__(self): self.desc = core.ProgramDesc() self.blocks = [Block(self, 0)] self.current_block_idx = 0 self._seed = 0 self._current_role = core.op_proto_and_checker_maker.OpRole.Forward self.__op_role_var = [] # for distribute training # _is_distributed = True if under distributed training self._is_distributed = False # _is_chief = True if the trainer is the first one, usually No.0 self._is_chief = False # _parameters_on_pservers records all the parameters distributed on parameter servers. self._parameters_on_pservers = None # _endpoints is a list about parameter servers ip:port, such as ["ip:port","ip:port"] self._endpoints = [] # if current role is parameter server, the _ps_endpoint is its "ip:port" self._ps_endpoint = None # trainers_endpoints, it is used for distribution. self._trainers_endpoints = [] # the distributed lookup table names self._distributed_lookup_table = None # use Deep gradient comrepssion or not self._enable_dgc = False self._use_lamb = False self._nccl_comm_num = 1 self._use_hierarchical_allreduce = False self._hierarchical_allreduce_inter_nranks = 0 # if this program has been optimized by distributed optimizer # fleet_opt will be given a value self._fleet_opt = None self._program_config = None # assigned if this program has been parsed by a pipeline optimizer self._pipeline_opt = None # appending gradients times self._appending_grad_times = 0 @property def _op_role(self): """ The operator role. In a enum {Forward, Backward, Optimize}. Notes: this is a low level API. It is used only for ParallelExecutor to duplicate or schedule operator to devices. For example, the forward operator should be executed on every device. The backward operator should be executed on every device and the parameter gradient of backward (use :code:`_op_role_var` to get this variable) operator should be merged to one device. The optimization operators should be executed on only one device and broadcast the optimization result, i.e., the new parameter, to every other device. """ return self._current_role @_op_role.setter def _op_role(self, role): self._current_role = role @property def _op_role_var(self): """ The auxiliary variables for :code:`_op_role` property. See Also: :code:`Program._op_role`'s documentation for details. Notes: This is a very low-level API. Users should not use it directly. """ return self.__op_role_var @contextlib.contextmanager def _backward_role_guard(self): tmp_role = self._current_role OpRole = core.op_proto_and_checker_maker.OpRole self._current_role = OpRole.Backward yield self._current_role = tmp_role @signature_safe_contextmanager def _optimized_guard(self, param_and_grads): """ A with guard to set :code:`Optimization` :code:`OpRole` and :code:`OpRoleVar` automatically. Notes: This is a very low level API. Users should not use it directly. Args: param_and_grads(list): The variables (names) to be optimized. Examples: >>> import paddle.fluid as fluid >>> p, g = backward(...) >>> with program._optimized_guard([p,g]): >>> p = p - 0.001 * g """ tmp_role = self._current_role tmp_var = self.__op_role_var OpRole = core.op_proto_and_checker_maker.OpRole self._current_role = OpRole.Optimize self.__op_role_var = [ var.name if isinstance(var, Variable) else var for var in param_and_grads ] yield self.__op_role_var = tmp_var self._current_role = tmp_role @signature_safe_contextmanager def _lr_schedule_guard(self, is_with_opt=False): """ A with guard to set :code:`LRSched` :code:`OpRole` and :code:`OpRoleVar` automatically. The :code:`OpRoleVar` is set to the target learning rate. Notes: This is a very low level API. Users should not use it directly. Args: is_with_opt: Only set to true if these ops a in the middle of a bunch of optimize ops so that it can be treated correctly. For example, sgd->lr_op->sgd->lr_op->sgd. Examples: >>> import paddle.fluid as fluid >>> p, g = backward(...) >>> with program.lr_schedule_guard(): >>> lr = lr * decay """ tmp_role = self._current_role tmp_var = self.__op_role_var OpRole = core.op_proto_and_checker_maker.OpRole self._current_role = OpRole.LRSched if is_with_opt: self._current_role = int(OpRole.LRSched) | int(OpRole.Optimize) # TODO(typhoonzero): how to set target learning rate var self.__op_role_var = [] yield self.__op_role_var = tmp_var self._current_role = tmp_role def __str__(self): """ Get the protobuf debug string of this Program. Returns: (str): The protobuf debug string. Raises: ValueError: If any of required fields is not set. """ return self.to_string(True) def to_string(self, throw_on_error, with_details=False): """ To debug string. Args: throw_on_error (bool): raise Value error when any of required fields is not set. with_details (bool): True if more details about variables and parameters, e.g., :code:`trainable`, :code:`optimize_attr`, need to print. Returns: str: The debug string describe current Program. Raises: ValueError: If any of required fields is not set and throw_on_error is True. Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() prog_string = prog.to_string(throw_on_error=True, with_details=False) print("program string without detial: {}".format(prog_string)) prog_string_with_detail = prog.to_string(throw_on_error=True, with_details=True) print("program string with detial: {}".format(prog_string_with_detail)) """ assert isinstance(throw_on_error, bool) and isinstance(with_details, bool) if with_details: res_str = "" for block in self.blocks: res_str += block.to_string(throw_on_error, with_details) else: protostr = self.desc.serialize_to_string() proto = framework_pb2.ProgramDesc.FromString( six.binary_type(protostr)) res_str = _debug_string_(proto, throw_on_error) return res_str def _get_desc(self): """ Get the C++ side of `ProgramDesc` object pointer. The C++ object is exposed by :code:`pybind`. Notes: This is a very low level API. Users should not use this API directly. """ return self.desc def _version(self): return self.desc._version() @dygraph_not_support def clone(self, for_test=False): """ **Notes**: **1.** :code:`Program.clone()` **method DOES NOT clone** :ref:`api_fluid_io_DataLoader` . **2. Recommend you to use** :code:`clone` **before using** :code:`Opimizer.minimize`. **3. This API has no effect in Dygraph Mode** Create a new Program with forward content of original one when ``for_test=True``. Create a new Program as the same as original one when ``for_test=False`` Some operators, e.g., :ref:`api_fluid_layers_batch_norm` , behave differently between training and testing. They have an attribute, :code:`is_test`, to control this behaviour. This method will change the :code:`is_test` attribute of them to :code:`True` when :code:`for_test=True`. * Set for_test to False when we want to clone the program for training. * Set for_test to True when we want to clone the program for testing. We will prune the backward and optimize part of the program when you use :code:`clone` after :code:`Opimizer.minimize`, but we still recommend you to use :code:`clone` before using :code:`Opimizer.minimize`. For Example: .. code-block:: python test_program = fluid.default_main_program().clone(for_test=True) # Here we use clone before Momentum optimizer = fluid.optimizer.Momentum(learning_rate=0.01, momentum=0.9) optimizer.minimize() Args: for_test (bool): True if change the :code:`is_test` attribute of operators to :code:`True`. Returns: Program: A new Program with forward content of original one when ``for_test=True``. A new Program as the same as original one when ``for_test=False`` Examples: **Notes: The Program's order maybe different after** :code:`clone` **and this will not affect your training or testing progress. In the following example we give you an simple method** :code:`print_prog(program)` **to print Program Descs inorder to make sure you have same print result after** :code:`clone`: .. code-block:: python import paddle.fluid as fluid import six def print_prog(prog): for name, value in sorted(six.iteritems(prog.block(0).vars)): print(value) for op in prog.block(0).ops: print("op type is {}".format(op.type)) print("op inputs are {}".format(op.input_arg_names)) print("op outputs are {}".format(op.output_arg_names)) for key, value in sorted(six.iteritems(op.all_attrs())): if key not in ['op_callstack', 'op_role_var']: print(" [ attrs: {}: {} ]".format(key, value)) 1. To clone a test program, the sample code is: .. code-block:: python import paddle.fluid as fluid import six def print_prog(prog): for name, value in sorted(six.iteritems(prog.block(0).vars)): print(value) for op in prog.block(0).ops: print("op type is {}".format(op.type)) print("op inputs are {}".format(op.input_arg_names)) print("op outputs are {}".format(op.output_arg_names)) for key, value in sorted(six.iteritems(op.all_attrs())): if key not in ['op_callstack', 'op_role_var']: print(" [ attrs: {}: {} ]".format(key, value)) train_program = fluid.Program() startup_program = fluid.Program() # startup_program is used to do some parameter init work, # and main program is used to hold the network with fluid.program_guard(train_program, startup_program): with fluid.unique_name.guard(): img = fluid.layers.data(name='image', shape=[784]) hidden = fluid.layers.fc(input=img, size=200, act='relu') hidden = fluid.layers.dropout(hidden, dropout_prob=0.5) loss = fluid.layers.cross_entropy( input=fluid.layers.fc(hidden, size=10, act='softmax'), label=fluid.layers.data(name='label', shape=[1], dtype='int64')) avg_loss = fluid.layers.mean(loss) test_program = train_program.clone(for_test=False) print_prog(test_program) # Due to parameter sharing usage for train and test, so we need to use startup program of train # instead of using test startup program, while nothing is in test's startup program # In Paddle Fluid we will share weights by using the same Variable name. In train and test program # all parameters will have the same name and this can make train and test program sharing parameters, # that's why we need to use startup program of train. And for startup program of test, it has nothing, # since it is a new program. with fluid.program_guard(train_program, startup_program): with fluid.unique_name.guard(): sgd = fluid.optimizer.SGD(learning_rate=1e-3) sgd.minimize(avg_loss) 2. The clone method can be avoid if you create program for training and program for testing individually. .. code-block:: python import paddle.fluid as fluid import six def print_prog(prog): for name, value in sorted(six.iteritems(prog.block(0).vars)): print(value) for op in prog.block(0).ops: print("op type is {}".format(op.type)) print("op inputs are {}".format(op.input_arg_names)) print("op outputs are {}".format(op.output_arg_names)) for key, value in sorted(six.iteritems(op.all_attrs())): if key not in ['op_callstack', 'op_role_var']: print(" [ attrs: {}: {} ]".format(key, value)) def network(is_test): img = fluid.layers.data(name='image', shape=[784]) hidden = fluid.layers.fc(input=img, size=200, act='relu') hidden = fluid.layers.dropout(hidden, dropout_prob=0.5) loss = fluid.layers.cross_entropy( input=fluid.layers.fc(hidden, size=10, act='softmax'), label=fluid.layers.data(name='label', shape=[1], dtype='int64')) avg_loss = fluid.layers.mean(loss) return avg_loss train_program_2 = fluid.Program() startup_program_2 = fluid.Program() test_program_2 = fluid.Program() with fluid.program_guard(train_program_2, startup_program_2): with fluid.unique_name.guard(): sgd = fluid.optimizer.SGD(learning_rate=1e-3) sgd.minimize(avg_loss) # the test startup program is not used. with fluid.program_guard(test_program_2, fluid.Program()): with fluid.unique_name.guard(): loss = network(is_test=True) print(test_program_2) The two code snippets above will generate and print same programs. """ if for_test: if self._appending_grad_times > 0: forward_prog = Program() forward_prog.desc = core.prune_backward(self.desc) forward_prog.blocks = [ Block(forward_prog, i) for i in six.moves.range(forward_prog.desc.num_blocks()) ] forward_prog._sync_with_cpp() p = forward_prog._inference_optimize(prune_read_op=False) else: p = self._inference_optimize(prune_read_op=False) else: p = Program() p.current_block_idx = self.current_block_idx p._seed = self._seed p.desc = core.ProgramDesc(self.desc) p.blocks = [ Block(p, i) for i in six.moves.range(self.desc.num_blocks()) ] p._current_role = self._current_role p.__op_role_var = self.__op_role_var p._appending_grad_times = self._appending_grad_times p._sync_with_cpp() p._copy_param_info_from(self) p._copy_data_info_from(self) p._copy_dist_param_info_from(self) return p def _prune(self, targets): """ Prune operators and variables which are not needed to generate :code:`targets`. Notes: This is a very low level API. Users should not use this API directly. This API is in flux and not stable. Args: targets(list|Variable|Operator): A list of variables or operators need to be pruned Returns: Program: A new, pruned program. """ if not isinstance(targets, list): targets = [targets] targets_idx = [] for t in targets: if not isinstance(t, Operator): if isinstance(t, Variable): # After transpiler processing, the op that output this # variable maybe has been changed, so t.op is not reliable # and we need to find the current op that generate this # variable here. t.op = None global_block = self.global_block() for idx, op in enumerate(global_block.ops): if t.name in op.output_arg_names: t.op = op break t = t.op if t is None: raise ValueError( "The target variable must have an " "associated operator that generates it.") else: raise ValueError("All targets of prune() can only be " "Variable or Operator.") targets_idx.append([t.block.idx, t.idx]) res = Program() res.desc = core.prune(self.desc, set(), targets_idx) res.blocks = [ Block(res, i) for i in six.moves.range(res.desc.num_blocks()) ] res._sync_with_cpp() return res def _prune_with_input(self, feeded_var_names, targets): """ Prune operators and variables which are not needed to generate :code:`targets`. Prune operators and variables which are needed to generate feeded_var Notes: This is a very low level API. Users should not use this API directly. This API is in flux and not stable. Args: feeded_var_names(list|str): A list of variable names from where pruning start. If it is set as [], this API works just like _prune() targets(list|Variable|Operator): A list of variables or operators need to be pruned Returns: Program: A new, pruned program. """ if not isinstance(feeded_var_names, list): feeded_var_names = [feeded_var_names] if not isinstance(targets, list): targets = [targets] for var in feeded_var_names: if not isinstance(var, six.string_types): raise ValueError("All feeded_var_names of prune() can only be " "str.") targets_idx = [] for t in targets: if not isinstance(t, Operator): if isinstance(t, Variable): # After transpiler processing, the op that output this # variable maybe has been changed, so t.op is not reliable # and we need to find the current op that generate this # variable here. t.op = None global_block = self.global_block() for idx, op in enumerate(global_block.ops): if t.name in op.output_arg_names: t.op = op break t = t.op if t is None: raise ValueError( "The target variable must have an " "associated operator that generates it.") else: raise ValueError("All targets of prune() can only be " "Variable or Operator.") targets_idx.append([t.block.idx, t.idx]) res = Program() res.desc = core.prune(self.desc, set(feeded_var_names), targets_idx) res.blocks = [ Block(res, i) for i in six.moves.range(res.desc.num_blocks()) ] res._sync_with_cpp() return res def _inference_optimize(self, prune_read_op=True): """ This method will create a new program and do following adjustments on it: 1. Remove all reader variables and their creator ops if exist. 2. Remove the :code:`read_op` if exists. 3. change the :code:`is_test` attribute of operators to :code:`True`. All the :code:`Parameter` information will be lost. Args: prune_read_op(bool): remove the read ops that are added by py_reader for cpp inference library Notes: This API is a very low level API. Use :code:`Program.clone(for_test=True)` instead. Returns: Program: The new program. """ res = Program() res.desc = core.ProgramDesc(self.desc) # remove all readers and the read_op if exist read_op_idx = 0 root_block = res.desc.block(0) if prune_read_op: while True: if read_op_idx >= root_block.op_size() or root_block.op( read_op_idx).type() == 'read': break read_op_idx += 1 if read_op_idx < root_block.op_size(): root_block._remove_op(0, read_op_idx + 1) for var in root_block.all_vars(): if var.type() == core.VarDesc.VarType.READER: root_block._remove_var(cpt.to_bytes(var.name())) # change all `is_test` attributes to True for i in six.moves.range(res.desc.num_blocks()): block = res.desc.block(i) for j in six.moves.range(block.op_size()): op = block.op(j) if op.has_attr('is_test'): op._set_attr('is_test', True) res.blocks = [ Block(res, i) for i in six.moves.range(res.desc.num_blocks()) ] res._sync_with_cpp() return res @staticmethod def parse_from_string(binary_str): """ **Notes**: **1. All information about parameters will be lost after serialization** **2. This API has no effect in Dygraph mode** Deserialize a Program from `protobuf `_ binary string. This method always use to save and load model Args: binary_str_type (str): the binary prootbuf string. Returns: Program: A deserialized Program. Examples: .. code-block:: python import paddle.fluid as fluid startup_prog = fluid.Program() main_prog = fluid.Program() with fluid.program_guard(startup_prog, main_prog): x = fluid.layers.data( name='X', shape=[1000, 784], dtype='float32', append_batch_size=False) y = fluid.layers.data( name='Y', shape=[784, 100], dtype='float32', append_batch_size=False) z = fluid.layers.mul(x=x, y=y) binary_str = fluid.default_main_program().desc.serialize_to_string() prog_restored = fluid.default_main_program().parse_from_string(binary_str) print(fluid.default_main_program()) print(prog_restored) """ p = Program() p.desc = core.ProgramDesc(binary_str) p.blocks = [Block(p, i) for i in six.moves.range(p.desc.num_blocks())] p._sync_with_cpp() return p @staticmethod def _construct_from_desc(desc): """ Construct a program from program desc. Args: desc(core.ProgramDesc): The program desc for constructing. Returns: Program: A program. """ p = Program() p.desc = desc p.blocks = [Block(p, i) for i in six.moves.range(p.desc.num_blocks())] p._sync_with_cpp() return p @property def random_seed(self): """ The default random seed for random operators in Program. ``0`` means get the random seed from random device. **Notes: It must be set before the operators have been added.** Returns: int64: Random seed in current Program Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() random_seed = prog.random_seed x_var = fluid.layers.data(name="X", shape=[3,3], dtype="float32", append_batch_size=False) # Here we need to set random seed before we use fluid.layers.dropout print(random_seed) prog.random_seed = 1 z_var = fluid.layers.dropout(x_var, 0.7) print(prog.random_seed) """ return self._seed @property def num_blocks(self): """ The number of :ref:`api_guide_Block_en` in this Program. **Notes: This API has no effect in Dygraph mode** Returns: int(Platform-dependent size): num of :ref:`api_guide_Block_en` in current Program Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() num_blocks = prog.num_blocks print(num_blocks) """ return self.desc.num_blocks() @random_seed.setter def random_seed(self, seed): if not isinstance(seed, int): raise ValueError("Seed must be a integer.") self._seed = seed def __repr__(self): return self.__str__() def global_block(self): """ **Notes**: **This API has no effect in Dygraph mode** Get the first :ref:`api_guide_Block_en` of this Program. Returns: :ref:`api_guide_Block_en`: The first :ref:`api_guide_Block_en` of this Program. Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() gb_block = prog.global_block() print(gb_block) """ return self.blocks[0] def block(self, index): """ **Notes**: **This API has no effect in Dygraph mode** Get the :code:`index` :ref:`api_guide_Block_en` of this Program Args: index (int) - The index of :ref:`api_guide_Block_en` to get Returns: :ref:`api_guide_Block_en`: The :code:`index` block Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() block_0 = prog.block(0) print(block_0) """ return self.blocks[index] def current_block(self): """ **Notes**: **This API has no effect in Dygraph mode** Get the current :ref:`api_guide_Block_en` . The :code:`current` :ref:`api_guide_Block_en` is the :ref:`api_guide_Block_en` to append operators. Returns: :ref:`api_guide_Block_en`: The :code:`index` :ref:`api_guide_Block_en` Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() current_blk = prog.current_block() print(current_blk) """ return self.blocks[self.current_block_idx] def _create_block(self, parent_idx=None): """ Create a new block with the :code:`parent_idx` and change the current block to new block. Args: parent_idx(int): The parent block index. Returns: Block: The new block. """ new_block_idx = len(self.blocks) parent = self.current_block() if parent_idx is None else self.block( parent_idx) self.desc.append_block(parent.desc) self.current_block_idx = new_block_idx self.blocks.append(Block(self, self.current_block_idx)) return self.current_block() def _rollback(self): """ Exit a code block, i.e., roll back to the parent block. Returns: None """ self.current_block_idx = self.current_block().parent_idx def _sync_with_cpp(self): """ Synchronize Python instance to its binding C++ object instance. If the program is modified in C++ space, this method should be invoked. Notes: This is a very low level API. Users should not invoke it directly. Returns: None """ for block_idx in range(len(self.blocks), self.desc.num_blocks()): self.blocks.append(Block(self, block_idx)) for block in self.blocks: block._sync_with_cpp() def _copy_param_info_from(self, other): """ Copy the information of parameters from other program. Notes: This is a very low level API. Users should not invoke it directly. Args: other(Program): Other program Returns: None """ if not isinstance(other, Program): raise TypeError("_copy_param_info_from should be invoked with " "Program") if len(self.blocks) != len(other.blocks): raise ValueError("_copy_param_info_from should be invoked with two " "program, with represent the same topology") self.global_block()._copy_param_info_from(other.global_block()) def _copy_dist_param_info_from(self, other): """ Copy the information of distributed information from other program. Args: other(Program): Other program Returns: None """ if not isinstance(other, Program): raise TypeError("_copy_dist_param_info_from should be invoked with " "Program") self._is_distributed = other._is_distributed self._is_chief = other._is_chief self._parameters_on_pservers = other._parameters_on_pservers self._endpoints = other._endpoints self._ps_endpoint = other._ps_endpoint self._distributed_lookup_table = other._distributed_lookup_table def _copy_data_info_from(self, other): """ Copy the information of data variables from other program. Notes: This is a very low level API. Users should not invoke it directly. Args: other(Program): Other program Returns: None """ if not isinstance(other, Program): raise TypeError("_copy_param_info_from should be invoked with " "Program") if len(self.blocks) != len(other.blocks): raise ValueError("_copy_param_info_from should be invoked with two " "program, with represent the same topology") for var in list(other.global_block().vars.values()): if var.is_data: self.global_block().var(var.name).is_data = True if var.desc.need_check_feed(): self.global_block().var(var.name).desc.set_need_check_feed(True) @dygraph_not_support def list_vars(self): """ Get all :ref:`api_guide_Variable_en` from this Program. A iterable object is returned. Returns: iterable :ref:`api_guide_Variable_en`: The Generator will yield every variable in this program. Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() img = fluid.layers.data(name='img', shape=[1,28,28], dtype='float32') label = fluid.layers.data(name='label', shape=[128,1], dtype='int64') for var in prog.list_vars(): print(var) """ for each_block in self.blocks: for each_var in list(each_block.vars.values()): yield each_var class Parameter(Variable): """ Parameter is derived from Variable. A parameter is a persistable Variable, and will be updated by optimizers after each iteration. The training of a neural network is essentially the updating of its parameters. Relative to a general Variable, a Parameter has several its own member variables: Args: trainable(bool): True if the parameter need to be updated after iterations. optimize_attr(map): Parameter attributes related with optimizing. Currently, it only contains 'learning_rate'. Default: {'learning_rate': 1.0} regularizer(WeightDecayRegularizer): The Regularizer which will be applied on the parameter. Default: None gradient_clip_attr(BaseGradientClipAttr): The gradint clip strategy which will be applied on the parameter. Default: None do_model_average(bool): True if the model average strategy will be applied on this parameter. """ def __init__(self, block, shape, dtype, **kwargs): if shape is None: raise ValueError("The shape of Parameter should not be None") if dtype is None: raise ValueError("The dtype of Parameter should not be None") if len(shape) == 0: raise ValueError( "The dimensions of shape for Parameter must be greater than 0") for each in shape: if each < 0: raise ValueError( "Each dimension of shape for Parameter must be greater than 0, but received %s" % list(shape)) Variable.__init__( self, block, persistable=True, shape=shape, dtype=dtype, **kwargs) self.trainable = kwargs.get('trainable', True) self.optimize_attr = kwargs.get('optimize_attr', {'learning_rate': 1.0}) self.regularizer = kwargs.get('regularizer', None) self.gradient_clip_attr = kwargs.get('gradient_clip_attr', None) self.do_model_average = kwargs.get('do_model_average', None) self.is_distributed = False def __str__(self): return self.to_string(True) def to_string(self, throw_on_error, with_details=False): """ To debug string. Args: throw_on_error(bool): raise exception when self is not initialized when throw_on_error is True with_details(bool): more details about variables and parameters (e.g. trainable, optimize_attr, ...) will be printed when with_details is True Returns(str): The debug string. Examples: .. code-block:: python import paddle.fluid as fluid prog = fluid.default_main_program() rlt = fluid.layers.data("fake_data", shape=[1,1], dtype='float32') debug_str = prog.to_string(throw_on_error=True, with_details=False) print(debug_str) """ assert isinstance(throw_on_error, bool) and isinstance(with_details, bool) if with_details: res_str = Variable.to_string(self, throw_on_error, True) additional_attr = ("trainable", "optimize_attr", "regularizer", "gradient_clip_attr", "do_model_average") for attr_name in additional_attr: res_str += "%s: %s\n" % (attr_name, cpt.to_text(getattr(self, attr_name))) else: res_str = Variable.to_string(self, throw_on_error, False) return res_str __repr__ = __str__ # program is a global instance. _main_program_ = Program() _startup_program_ = Program() def default_startup_program(): """ Get default/global startup program. The layer function in :ref:`api_fluid_layers` will create parameters, :ref:`api_paddle_data_reader_reader` , `NCCL `_ handles as global variables. The :code:`startup_program` will initialize them by the OPs in startup :ref:`api_fluid_Program` . The :ref:`api_fluid_layers` function will append these initialization operators into startup program. This method will return the :code:`default` or the :code:`current` startup program. Users can use :ref:`api_fluid_program_guard` to switch :ref:`api_fluid_Program` . Returns: current default startup :ref:`api_fluid_Program` Returns type: :ref:`api_fluid_Program` Examples: .. code-block:: python import paddle.fluid as fluid main_program = fluid.Program() startup_program = fluid.Program() with fluid.program_guard(main_program=main_program, startup_program=startup_program): x = fluid.layers.data(name="x", shape=[-1, 784], dtype='float32') y = fluid.layers.data(name="y", shape=[-1, 1], dtype='int32') z = fluid.layers.fc(name="fc", input=x, size=10, act="relu") print("main program is: {}".format(fluid.default_main_program())) print("start up program is: {}".format(fluid.default_startup_program())) """ return _startup_program_ def default_main_program(): """ This API can be used to get ``default main program`` which store the descriptions of ``op`` and ``variable``. For example ``z = fluid.layers.elementwise_add(x, y)`` will create a new ``elementwise_add`` ``op`` and a new ``z`` ``variable``, and they will be recorded in ``default main program`` The ``default_main_program`` is the default value for ``Program`` parameter in a lot of ``fluid`` APIs. For example, the :code:`Executor.run()` will execute the :code:`default_main_program` when the program is not specified. If you want to replace the ``default main program``, you can use :ref:`api_fluid_program_guard` Returns: :ref:`api_fluid_Program`: a ``Program`` which holding the descriptions of ops and variables in the network. Examples: .. code-block:: python import paddle.fluid as fluid # Sample Network: data = fluid.data(name='image', shape=[None, 3, 224, 224], dtype='float32') label = fluid.data(name='label', shape=[None, 1], dtype='int64') conv1 = fluid.layers.conv2d(data, 4, 5, 1, act=None) bn1 = fluid.layers.batch_norm(conv1, act='relu') pool1 = fluid.layers.pool2d(bn1, 2, 'max', 2) conv2 = fluid.layers.conv2d(pool1, 16, 5, 1, act=None) bn2 = fluid.layers.batch_norm(conv2, act='relu') pool2 = fluid.layers.pool2d(bn2, 2, 'max', 2) fc1 = fluid.layers.fc(pool2, size=50, act='relu') fc2 = fluid.layers.fc(fc1, size=102, act='softmax') loss = fluid.layers.cross_entropy(input=fc2, label=label) loss = fluid.layers.mean(loss) opt = fluid.optimizer.Momentum( learning_rate=0.1, momentum=0.9, regularization=fluid.regularizer.L2Decay(1e-4)) opt.minimize(loss) #print the number of blocks in the program, 1 in this case print(fluid.default_main_program().num_blocks) #print the description of variable 'image' print(fluid.default_main_program().blocks[0].var('image')) """ return _main_program_ def switch_main_program(program): """ Switch the main program to a new program. Args: program(Program): The new main program Returns: Program: The previous main program """ global _main_program_ prev_program = _main_program_ _main_program_ = program return prev_program def switch_startup_program(program): """ Switch the startup program to a new program Args: program(Program): The new startup program Returns: Program: The previous startup program """ global _startup_program_ prev_program = _startup_program_ _startup_program_ = program return prev_program @signature_safe_contextmanager def program_guard(main_program, startup_program=None): """ Change the global main program and startup program with `"with"` statement. Layer functions in the Python `"with"` block will append operators and variables to the new main programs. Args: main_program(Program): New main program inside `"with"` statement. startup_program(Program, optional): New startup program inside `"with"` statement. :code:`None` means not changing startup program, default_startup_program is still used. Default: None. Examples: .. code-block:: python import paddle.fluid as fluid main_program = fluid.Program() startup_program = fluid.Program() with fluid.program_guard(main_program, startup_program): data = fluid.data(name='image', shape=[None, 784, 784], dtype='float32') hidden = fluid.layers.fc(input=data, size=10, act='relu') Notes: The temporary :code:`Program` can be used if the user does not need to construct either of startup program or main program. Examples: .. code-block:: python import paddle.fluid as fluid main_program = fluid.Program() # does not care about startup program. Just pass a temporary value. with fluid.program_guard(main_program, fluid.Program()): data = fluid.data(name='image', shape=[None, 784, 784], dtype='float32') """ if not isinstance(main_program, Program): raise TypeError("main_program should be Program") main_program = switch_main_program(main_program) if startup_program is not None: if not isinstance(startup_program, Program): raise TypeError("startup_program should be Program") startup_program = switch_startup_program(startup_program) yield switch_main_program(main_program) if startup_program is not None: switch_startup_program(startup_program) def _get_var(name, program=None): """ Get a variable by name from the global block of a program. Args: name(str): name of the variable program(Program|None): program object. If None, default_global_program() will be used. Returns: Variable """ if program is None: program = default_main_program() assert isinstance(name, str) assert isinstance(program, Program) return program.global_block().var(name) @signature_safe_contextmanager def _dygraph_guard(tracer): global _dygraph_tracer_ tmp_trace = _dygraph_tracer_ _dygraph_tracer_ = tracer core._switch_tracer(tracer) yield core._switch_tracer(tmp_trace) _dygraph_tracer_ = tmp_trace @signature_safe_contextmanager def _dygraph_place_guard(place): global _dygraph_current_expected_place_ tmp_place = _dygraph_current_expected_place_ _dygraph_current_expected_place_ = place yield _dygraph_current_expected_place_ = tmp_place def load_op_library(lib_filename): """ Load a dynamic library, including custom operators and kernels. When library is loaded, ops and kernels registered in the library will be available in PaddlePaddle main process. Please note, the type of custom operators cann't have the same type with the existing operators in the framework. Args: lib_filename (str): name of dynamic library. Examples: .. code-block:: python import paddle.fluid as fluid #fluid.load_op_library('custom_op.so') """ core.load_op_library(lib_filename) OpProtoHolder.instance().update_op_proto()