# Copyright (c) 2019 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 os import pickle import warnings import functools from collections import OrderedDict import six import paddle from paddle.fluid import core from paddle.fluid.compiler import BuildStrategy, CompiledProgram, ExecutionStrategy from paddle.fluid.data_feeder import check_type from paddle.fluid.dygraph.base import program_desc_tracing_guard, switch_to_static_graph from paddle.fluid.dygraph.dygraph_to_static import logging_utils from paddle.fluid.dygraph.dygraph_to_static.logging_utils import set_code_level, set_verbosity from paddle.fluid.dygraph.dygraph_to_static.program_translator import ProgramTranslator, StaticLayer, unwrap_decorators from paddle.fluid.dygraph.io import EXTRA_VAR_INFO_FILENAME, VARIABLE_FILENAME, TranslatedLayer from paddle.fluid.dygraph.layers import Layer from paddle.fluid.executor import Executor, scope_guard from paddle.fluid.framework import Block, ParamBase, Program, Variable from paddle.fluid.framework import _current_expected_place, _dygraph_guard, _dygraph_tracer from paddle.fluid.framework import dygraph_only, in_dygraph_mode from paddle.fluid.wrapped_decorator import wrap_decorator __all__ = [ 'TracedLayer', 'declarative', 'dygraph_to_static_func', 'set_code_level', 'set_verbosity', 'save', 'load', 'SaveLoadConfig' ] def create_program_from_desc(program_desc): program = Program() program.desc = program_desc program.blocks = [Block(program, 0)] program._sync_with_cpp() return program def _extract_vars(inputs, result_list): if isinstance(inputs, Variable): result_list.append(inputs) elif isinstance(inputs, (list, tuple)): for var in inputs: _extract_vars(var, result_list) else: raise TypeError( "The type of 'each element of inputs' in fluid.dygraph.jit.TracedLayer.trace must be fluid.Variable, but received {}.". format(type(inputs))) def extract_vars(inputs): result_list = [] _extract_vars(inputs, result_list) return result_list def _dygraph_to_static_func_(dygraph_func): """ Converts imperative dygraph APIs into declarative function APIs. Decorator @dygraph_to_static_func only converts imperative dygraph APIs into declarative net-building APIs, which means it doesn't return immediate digital result as imperative mode. Users should handle Program and Executor by themselves. Note: This decorator is NOT our recommended way to transform imperative function to declarative function. We will remove this decorator after we finalize cleaning up code. Args: dygraph_func (callable): callable imperative function. Returns: Callable: converting imperative dygraph APIs into declarative net-building APIs. Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np from paddle.fluid.dygraph.jit import dygraph_to_static_func @dygraph_to_static_func def func(x): if fluid.layers.mean(x) < 0: x_v = x - 1 else: x_v = x + 1 return x_v x = fluid.layers.fill_constant(shape=[3, 3], value=0, dtype='float64') x_v = func(x) exe = fluid.Executor(fluid.CPUPlace()) out = exe.run(fetch_list=[x_v]) print(out[0]) # [[1. 1. 1.] # [1. 1. 1.] # [1. 1. 1.]] """ # TODO: remove this decorator after we finalize training API def __impl__(*args, **kwargs): program_translator = ProgramTranslator() if in_dygraph_mode() or not program_translator.enable_to_static: logging_utils.warn( "The decorator 'dygraph_to_static_func' doesn't work in " "dygraph mode or set ProgramTranslator.enable to False. " "We will just return dygraph output.") return dygraph_func(*args, **kwargs) static_func = program_translator.get_func(dygraph_func) return static_func(*args, **kwargs) return __impl__ dygraph_to_static_func = wrap_decorator(_dygraph_to_static_func_) def copy_decorator_attrs(original_func, decorated_obj): """ Copies some necessary attributes from original function into decorated function. Args: original_func(callable): the original decorated function. decorated_obj(StaticLayer): the target decorated StaticLayer object. """ decorator_name = "declarative" decorated_obj.__name__ = original_func.__name__ decorated_obj._decorator_name = decorator_name decorated_obj.__wrapped__ = original_func decorated_obj.__doc__ = original_func.__doc__ if hasattr(original_func, "__module__"): decorated_obj.__module__ = original_func.__module__ return decorated_obj def declarative(function=None, input_spec=None): """ Converts imperative dygraph APIs into declarative function APIs. Decorator @declarative handles the Program and Executor of static mode and returns the result as dygraph Tensor(s). Users could use the returned dygraph Tensor(s) to do imperative training, inference, or other operations. If the decorated function calls other imperative function, the called one will be converted into declarative function as well. Args: function (callable): callable imperative function. input_spec(list[InputSpec]): list of InputSpec to specific the shape/dtype/name information of each input Tensor. Returns: Tensor(s): containing the numerical result. Examples: .. code-block:: python import paddle.fluid as fluid import numpy as np from paddle.fluid.dygraph.jit import declarative fluid.enable_dygraph() @declarative def func(x): x = fluid.dygraph.to_variable(x) if fluid.layers.mean(x) < 0: x_v = x - 1 else: x_v = x + 1 return x_v x = np.ones([1, 2]) x_v = func(x) print(x_v.numpy()) # [[2. 2.]] """ def decorated(python_func): """ Decorates a python function into a StaticLayer object. """ # Step 1. unwrap the function if it is already decorated. _, python_func = unwrap_decorators(python_func) # Step 2. copy some attributes from original python function. static_layer = copy_decorator_attrs( original_func=python_func, decorated_obj=StaticLayer( function=python_func, input_spec=input_spec)) return static_layer # for usage: `declarative(foo, ...)` if function is not None: if isinstance(function, Layer): if isinstance(function.forward, StaticLayer): class_name = function.__class__.__name__ logging_utils.warn( "`{}.forward` has already been decorated somewhere. It will be redecorated to replace previous one.". format(class_name)) function.forward = decorated(function.forward) return function else: return decorated(function) # for usage: `@declarative` return decorated class SaveLoadConfig(object): """ The additional configuration options may be used in function ``paddle.jit.save/load`` and ``paddle.load`` . Examples: 1. Using ``SaveLoadConfig`` when saving model .. code-block:: python import paddle import paddle.nn as nn import paddle.optimizer as opt class SimpleNet(nn.Layer): def __init__(self, in_size, out_size): super(SimpleNet, self).__init__() self._linear = nn.Linear(in_size, out_size) @paddle.jit.to_static def forward(self, x): y = self._linear(x) z = self._linear(y) return z # enable dygraph mode paddle.disable_static() # train model net = SimpleNet(8, 8) adam = opt.Adam(learning_rate=0.1, parameters=net.parameters()) x = paddle.randn([4, 8], 'float32') for i in range(10): out = net(x) loss = paddle.tensor.mean(out) loss.backward() adam.step() adam.clear_grad() # use SaveLoadconfig when saving model model_path = "simplenet.example.model" config = paddle.SaveLoadConfig() config.model_filename = "__simplenet__" paddle.jit.save( layer=net, model_path=model_path, config=config) 2. Using ``SaveLoadConfig`` when loading model .. code-block:: python import paddle # enable dygraph mode paddle.disable_static() # use SaveLoadconfig when loading model model_path = "simplenet.example.model" config = paddle.SaveLoadConfig() config.model_filename = "__simplenet__" infer_net = paddle.jit.load(model_path, config=config) # inference x = paddle.randn([4, 8], 'float32') pred = infer_net(x) """ def __init__(self): self._output_spec = None self._model_filename = None self._params_filename = None self._separate_params = False # used for `paddle.load` self._keep_name_table = False # NOTE: Users rarely use following configs, so these configs are not open to users, # reducing user learning costs, but we retain the configuration capabilities # If True, programs are modified to only support direct inference deployment. # Otherwise,more information will be stored for flexible optimization and re-training. # Currently, only True is supported self._export_for_deployment = True # If True, It will save inference program only, and do not save params of Program self._program_only = False @property def output_spec(self): """ Selects the output targets of the saved model ( ``paddle.jit.TranslatedLayer`` ). By default, all return variables of original Layer's forward function are kept as the output of the saved TranslatedLayer. The ``output_spec`` type should be list[Variable]. If the provided ``output_spec`` list is not all output variables, the saved model will be pruned according to the given ``output_spec`` list. .. note:: The ``output_spec`` is only used when saving model. Examples: .. code-block:: python import paddle import paddle.nn as nn import paddle.optimizer as opt class SimpleNet(nn.Layer): def __init__(self, in_size, out_size): super(SimpleNet, self).__init__() self._linear = nn.Linear(in_size, out_size) @paddle.jit.to_static def forward(self, x): y = self._linear(x) z = self._linear(y) loss = paddle.tensor.mean(z) return z, loss # enable dygraph mode paddle.disable_static() # train model net = SimpleNet(8, 8) adam = opt.Adam(learning_rate=0.1, parameters=net.parameters()) x = paddle.randn([4, 8], 'float32') for i in range(10): out, loss = net(x) loss.backward() adam.step() adam.clear_grad() # use SaveLoadconfig.output_spec model_path = "simplenet.example.model.output_spec" config = paddle.SaveLoadConfig() config.output_spec = [out] paddle.jit.save( layer=net, model_path=model_path, config=config) infer_net = paddle.jit.load(model_path) x = paddle.randn([4, 8], 'float32') pred = infer_net(x) """ return self._output_spec @output_spec.setter def output_spec(self, spec): if not isinstance(spec, list): raise TypeError( "The SaveLoadConfig.output_spec should be 'list', but received input type is %s." % type(input)) for var in spec: if not isinstance(var, core.VarBase): raise TypeError( "The element in SaveLoadConfig.output_spec list should be 'Variable', but received element's type is %s." % type(var)) self._output_spec = spec @property def model_filename(self): """ The name of file to save the translated program of target Layer. Default filename is :code:`__model__` . Examples: .. code-block:: python import paddle import paddle.nn as nn import paddle.optimizer as opt class SimpleNet(nn.Layer): def __init__(self, in_size, out_size): super(SimpleNet, self).__init__() self._linear = nn.Linear(in_size, out_size) @paddle.jit.to_static def forward(self, x): y = self._linear(x) z = self._linear(y) return z # enable dygraph mode paddle.disable_static() # train model net = SimpleNet(8, 8) adam = opt.Adam(learning_rate=0.1, parameters=net.parameters()) x = paddle.randn([4, 8], 'float32') for i in range(10): out = net(x) loss = paddle.tensor.mean(out) loss.backward() adam.step() adam.clear_grad() # saving with configs.model_filename model_path = "simplenet.example.model.model_filename" config = paddle.SaveLoadConfig() config.model_filename = "__simplenet__" paddle.jit.save( layer=net, model_path=model_path, config=config) # loading with configs.model_filename infer_net = paddle.jit.load(model_path, config=config) x = paddle.randn([4, 8], 'float32') pred = infer_net(x) """ return self._model_filename @model_filename.setter def model_filename(self, filename): if not isinstance(filename, six.string_types): raise TypeError( "The SaveLoadConfig.model_filename should be str, but received input's type is %s." % type(filename)) if len(filename) == 0: raise ValueError( "The SaveLoadConfig.model_filename is empty string.") self._model_filename = filename @property def params_filename(self): """ The name of file to save all persistable variables in target Layer. Default file name is :code:`__variables__` . Examples: .. code-block:: python import paddle import paddle.nn as nn import paddle.optimizer as opt class SimpleNet(nn.Layer): def __init__(self, in_size, out_size): super(SimpleNet, self).__init__() self._linear = nn.Linear(in_size, out_size) @paddle.jit.to_static def forward(self, x): y = self._linear(x) z = self._linear(y) return z # enable dygraph mode paddle.disable_static() # train model net = SimpleNet(8, 8) adam = opt.Adam(learning_rate=0.1, parameters=net.parameters()) x = paddle.randn([4, 8], 'float32') for i in range(10): out = net(x) loss = paddle.tensor.mean(out) loss.backward() adam.step() adam.clear_grad() model_path = "simplenet.example.model.params_filename" config = paddle.SaveLoadConfig() config.params_filename = "__params__" # saving with configs.params_filename paddle.jit.save( layer=net, model_path=model_path, config=config) # loading with configs.params_filename infer_net = paddle.jit.load(model_path, config=config) x = paddle.randn([4, 8], 'float32') pred = infer_net(x) """ return self._params_filename @params_filename.setter def params_filename(self, filename): if not isinstance(filename, six.string_types): raise TypeError( "The SaveLoadConfig.params_filename should be str, but received input's type is %s." % type(filename)) if len(filename) == 0: raise ValueError( "The SaveLoadConfig.params_filename is empty string.") self._params_filename = filename # NOTE: [why not use params_filename=None control params saved separately] # The new save interface does not recommend parameters to be saved separately. # Here, the concept should be separated as clearly as possible. # Setting params_filename=None only means that the saved file name is set # and without any other meaning. New separate_params control for file saved # separately can makes the concept clearer. @property def separate_params(self): """ Configure whether to save the Layer parameters as separete files. (In order to be compatible with the behavior of ``paddle.static.save_inference_model`` ) If True, each parameter will be saved to a file separately, the file name is the parameter name, and the SaveLoadConfig.params_filename configuration will not take effect. Default False. .. note:: Only used for ``paddle.jit.save`` . Examples: .. code-block:: python import paddle import paddle.nn as nn import paddle.optimizer as opt class SimpleNet(nn.Layer): def __init__(self, in_size, out_size): super(SimpleNet, self).__init__() self._linear = nn.Linear(in_size, out_size) @paddle.jit.to_static def forward(self, x): y = self._linear(x) z = self._linear(y) return z # enable dygraph mode paddle.disable_static() # train model net = SimpleNet(8, 8) adam = opt.Adam(learning_rate=0.1, parameters=net.parameters()) x = paddle.randn([4, 8], 'float32') for i in range(10): out = net(x) loss = paddle.tensor.mean(out) loss.backward() adam.step() adam.clear_grad() model_path = "simplenet.example.model.separate_params" config = paddle.SaveLoadConfig() config.separate_params = True # saving with configs.separate_params paddle.jit.save( layer=net, model_path=model_path, config=config) # [result] the saved model directory contains: # linear_0.b_0 linear_0.w_0 __model__ __variables.info__ # loading with configs.params_filename infer_net = paddle.jit.load(model_path, config=config) x = paddle.randn([4, 8], 'float32') pred = infer_net(x) """ return self._separate_params @separate_params.setter def separate_params(self, value): if not isinstance(value, bool): raise TypeError( "The SaveLoadConfig.separate_params should be bool value, but received input's type is %s." % type(value)) self._separate_params = value @property def keep_name_table(self): """ Configures whether keep ``structured_name -> parameter_name`` dict in loaded state dict. This dict is the debugging information saved when call ``paddle.save`` . It is generally only used for debugging and does not affect the actual training or inference. By default, it will not be retained in ``paddle.load`` result. Default: False. .. note:: Only used for ``paddle.load`` . Examples: .. code-block:: python import paddle paddle.disable_static() linear = paddle.nn.Linear(5, 1) state_dict = linear.state_dict() paddle.save(state_dict, "paddle_dy.pdparams") config = paddle.SaveLoadConfig() config.keep_name_table = True para_state_dict = paddle.load("paddle_dy.pdparams", config) print(para_state_dict) # the name_table is 'StructuredToParameterName@@' # {'bias': array([0.], dtype=float32), # 'StructuredToParameterName@@': # {'bias': u'linear_0.b_0', 'weight': u'linear_0.w_0'}, # 'weight': array([[ 0.04230034], # [-0.1222527 ], # [ 0.7392676 ], # [-0.8136974 ], # [ 0.01211023]], dtype=float32)} """ return self._keep_name_table @keep_name_table.setter def keep_name_table(self, value): if not isinstance(value, bool): raise TypeError( "The SaveLoadConfig.keep_name_table should be bool value, but received input's type is %s." % type(value)) self._keep_name_table = value def _get_input_var_names(inputs, input_spec): name_none_error = "The %s's name is None. " \ "When using jit.save, please set InputSepc's name in " \ "to_static(input_spec=[]) and jit.save(input_spec=[]) " \ "and make sure they are consistent." name_no_exists_error = "The tensor `%s` does not exists. " \ "Please make sure the name of InputSpec or example Tensor " \ "in input_spec is the same as the name of InputSpec in " \ "`to_static` decorated on the Layer.forward method." result_list = [] input_var_names = [var.name for var in inputs if isinstance(var, Variable)] if input_spec is None: # no prune result_list = input_var_names elif input_spec is not None and len(input_spec) == len(input_var_names): # no prune result_list = input_var_names # if input spec name not in input_var_names, only raise warning for spec in input_spec: if spec.name is None: warnings.warn(name_none_error % spec) elif spec.name not in input_var_names: warnings.warn(name_no_exists_error % spec.name) else: # do nothing pass else: # prune for spec in input_spec: if spec.name is None: # name is None, the input_spec only can be InputSpec raise ValueError(name_none_error % spec) elif spec.name not in input_var_names: # the input_spec can be `InputSpec` or `VarBase` raise ValueError(name_no_exists_error % spec.name) else: result_list.append(spec.name) return result_list def _get_output_vars(outputs, output_spec): name_no_exists_error = "The tensor `%s` does not exists. " \ "Please make sure the name of example Tensor " \ "in configs.output_spec is the output tensor of " \ "Layer.forward method." result_list = [] output_vars_dict = OrderedDict() for var in outputs: if isinstance(var, Variable): output_vars_dict[var.name] = var if output_spec is None: result_list = output_vars_dict.values() elif output_spec is not None and len(output_spec) == len(output_vars_dict): result_list = output_vars_dict.values() for var in output_spec: if var.name not in output_vars_dict: warnings.warn(name_no_exists_error % var.name) else: for var in output_spec: if var.name not in output_vars_dict: raise ValueError(name_no_exists_error % var.name) else: result_list.append(output_vars_dict[var.name]) return result_list # NOTE(chenweihang): change jit.save/load argument `configs` to `config` def deprecate_save_load_configs(func): @functools.wraps(func) def wrapper(*args, **kwargs): if 'configs' in kwargs: kwargs['config'] = kwargs['configs'] kwargs.pop('configs') return func(*args, **kwargs) return wrapper @deprecate_save_load_configs @switch_to_static_graph def save(layer, model_path, input_spec=None, config=None): """ Saves input declarative Layer as :ref:`api_imperative_TranslatedLayer` format model, which can be used for inference or fine-tuning after loading. It will save the translated program and all related persistable variables of input declarative Layer to given ``model_path``. The default saved translated program file name is ``__model__``, and the default saved persistable variables file name is ``__variables__``, and it also saved some additional variable description information to file ``__variables.info__``, these additional information is used in fine-tuning. The saved model can be loaded by follow APIs: - :ref:`api_imperative_jit_load` - :ref:`api_fluid_io_load_inference_model` (need pass ``params_filename='__variables__'``) - Other C++ inference APIs Args: layer (Layer): the Layer to be saved. The Layer should be decorated by `@declarative`. model_path (str): the directory to save the model. input_spec (list[Variable], optional): Describes the input of the saved model. It is the example inputs that will be passed to saved TranslatedLayer's forward function. If None, all input variables of the original Layer's forward function would be the inputs of the saved model. Default None. config (SaveLoadConfig, optional): :ref:`api_imperative_jit_saveLoadConfig` object that specifies additional configuration options. Default None. Returns: None Examples: .. code-block:: python import numpy as np import paddle import paddle.nn as nn import paddle.optimizer as opt BATCH_SIZE = 16 BATCH_NUM = 4 EPOCH_NUM = 4 IMAGE_SIZE = 784 CLASS_NUM = 10 # define a random dataset class RandomDataset(paddle.io.Dataset): def __init__(self, num_samples): self.num_samples = num_samples def __getitem__(self, idx): image = np.random.random([IMAGE_SIZE]).astype('float32') label = np.random.randint(0, CLASS_NUM - 1, (1, )).astype('int64') return image, label def __len__(self): return self.num_samples class LinearNet(nn.Layer): def __init__(self): super(LinearNet, self).__init__() self._linear = nn.Linear(IMAGE_SIZE, CLASS_NUM) @paddle.jit.to_static def forward(self, x): return self._linear(x) def train(layer, loader, loss_fn, opt): for epoch_id in range(EPOCH_NUM): for batch_id, (image, label) in enumerate(loader()): out = layer(image) loss = loss_fn(out, label) loss.backward() opt.step() opt.clear_grad() print("Epoch {} batch {}: loss = {}".format( epoch_id, batch_id, np.mean(loss.numpy()))) # enable dygraph mode place = paddle.CPUPlace() paddle.disable_static(place) # 1. train & save model. # create network layer = LinearNet() loss_fn = nn.CrossEntropyLoss() adam = opt.Adam(learning_rate=0.001, parameters=layer.parameters()) # create data loader dataset = RandomDataset(BATCH_NUM * BATCH_SIZE) loader = paddle.io.DataLoader(dataset, places=place, batch_size=BATCH_SIZE, shuffle=True, drop_last=True, num_workers=2) # train train(layer, loader, loss_fn, adam) # save model_path = "linear.example.model" paddle.jit.save(layer, model_path) """ # 1. input check prog_translator = ProgramTranslator() if not prog_translator.enable_to_static: raise RuntimeError( "The paddle.jit.save doesn't work when setting ProgramTranslator.enable to False." ) if not isinstance(layer, Layer): raise TypeError( "The input layer of paddle.jit.save should be 'Layer', but received layer type is %s." % type(layer)) configs = config if configs is None: configs = SaveLoadConfig() # avoid change user given input_spec inner_input_spec = None if input_spec is not None: if not isinstance(input_spec, list): raise TypeError( "The input input_spec should be 'list', but received input_spec's type is %s." % type(input_spec)) inner_input_spec = [] for var in input_spec: if isinstance(var, paddle.static.InputSpec): inner_input_spec.append(var) elif isinstance(var, (core.VarBase, Variable)): inner_input_spec.append( paddle.static.InputSpec.from_tensor(var)) else: raise TypeError( "The element in input_spec list should be 'Variable' or `paddle.static.InputSpec`, but received element's type is %s." % type(var)) # 2. get program from Layer # TODO(chenweihang): add support for other method, not only forward if isinstance(layer.forward, StaticLayer): concrete_program = layer.forward.concrete_program else: # transform in jit.save, if input_spec is incomplete, declarative will throw error static_forward = declarative(layer.forward, input_spec=inner_input_spec) concrete_program = static_forward.concrete_program # the input_spec has been used in declarative, which is equal to # @declarative with input_spec and jit.save without input_spec, # avoid needless warning inner_input_spec = None # 3. build input & output of save_infernece_model # NOTE(chenweihang): [ Get input variables name ] # There are two cases, whether to prune the inputs or not # - not prune inputs (recommend): # - the len(input_spec) == len((concrete_program.inputs) - 1 # - here can use concrete_program.inputs directly # - prune inputs: # - the input_spec length < len((concrete_program.inputs) - 1 # - the input_spec's name should be in concrete_program.inputs input_var_names = _get_input_var_names(concrete_program.inputs, inner_input_spec) # NOTE(chenweihang): [ Get output variables ] # the rule is like [ Get input variables name ]. For output var, # we only support VarBase spec, and actually, we only need the # var name of output, and we don't recommended to use output_spec output_vars = _get_output_vars(concrete_program.outputs, configs.output_spec) # NOTE(chenweihang): we maintain the mapping of variable name to # structured name, the buffer variable (non-persistable) # saved to inference program may not need by dygraph Layer, # we only record the state_dict variable's structured name state_names_dict = dict() for structured_name, var in six.iteritems(layer.state_dict()): state_names_dict[var.name] = structured_name # 4. share parameters from Layer to scope & record var info scope = core.Scope() extra_var_info = dict() for param_or_buffer in concrete_program.parameters: # share to scope param_or_buffer_tensor = scope.var(param_or_buffer.name).get_tensor() src_tensor = param_or_buffer.value().get_tensor() param_or_buffer_tensor._share_data_with(src_tensor) # record var info extra_info_dict = dict() if param_or_buffer.name in state_names_dict: extra_info_dict['structured_name'] = state_names_dict[ param_or_buffer.name] extra_info_dict['stop_gradient'] = param_or_buffer.stop_gradient if isinstance(param_or_buffer, ParamBase): extra_info_dict['trainable'] = param_or_buffer.trainable extra_var_info[param_or_buffer.name] = extra_info_dict # 5. save inference model from paddle.fluid.io import save_inference_model # VARIABLE_FILENAME keep nameing style consistent with '__model__' if configs.params_filename is None: configs.params_filename = VARIABLE_FILENAME with scope_guard(scope): save_inference_model( dirname=model_path, feeded_var_names=input_var_names, target_vars=output_vars, executor=Executor(_current_expected_place()), main_program=concrete_program.main_program.clone(), model_filename=configs.model_filename, params_filename=None if configs.separate_params else configs.params_filename, export_for_deployment=configs._export_for_deployment, program_only=configs._program_only) # NOTE(chenweihang): [ Save extra variable info ] # save_inference_model will lose some important variable information, including: # - Variable name and correspondence (when saved variables as one file) # - Variable.stop_gradient information # - Which persistent variable are parameter and which are not # - Parameter.trainable information # # The lost information cannot be recovered when it is loaded again, # so if we want to perform fine-tune after loading, we may need to # configure redundant information to proceed. # # Due to compatibility issues, we cannot change the original storage structure, # but we can save these information in `jit.save` without changing the original # storage to improve user experience. So we save extra information into # file `__variables.info__` extra_var_info_path = os.path.join(model_path, EXTRA_VAR_INFO_FILENAME) with open(extra_var_info_path, 'wb') as f: pickle.dump(extra_var_info, f, protocol=2) @deprecate_save_load_configs @dygraph_only def load(model_path, config=None): """ :api_attr: imperative Load model saved by :ref:`api_imperative_jit_save` or :ref:`api_fluid_io_save_inference_model` as :ref:`api_imperative_TranslatedLayer`, then performing inference or fine-tune training. .. note:: For some historical reasons, if you load model saved by :ref:`api_fluid_io_save_inference_model`, there will be the following limitations when using it in fine-tuning: 1. Imperative mode do not support LoDTensor. All original model's feed targets or parametars that depend on LoD are temporarily unavailable. 2. All saved model's feed targets need to be passed into TranslatedLayer's forward function. 3. The variable's ``stop_gradient`` information is lost and can not be recovered. 4. The parameter's ``trainable`` information is lost and can not be recovered. Args: model_path (str): The directory path where the model is saved. config (SaveLoadConfig, optional): :ref:`api_imperative_jit_saveLoadConfig` object that specifies additional configuration options. Default None. Returns: TranslatedLayer: A Layer object can run saved translated model. Examples: 1. Load model saved by :ref:`api_imperative_jit_save` then performing inference and fine-tune training. .. code-block:: python import numpy as np import paddle import paddle.nn as nn import paddle.optimizer as opt BATCH_SIZE = 16 BATCH_NUM = 4 EPOCH_NUM = 4 IMAGE_SIZE = 784 CLASS_NUM = 10 # define a random dataset class RandomDataset(paddle.io.Dataset): def __init__(self, num_samples): self.num_samples = num_samples def __getitem__(self, idx): image = np.random.random([IMAGE_SIZE]).astype('float32') label = np.random.randint(0, CLASS_NUM - 1, (1, )).astype('int64') return image, label def __len__(self): return self.num_samples class LinearNet(nn.Layer): def __init__(self): super(LinearNet, self).__init__() self._linear = nn.Linear(IMAGE_SIZE, CLASS_NUM) @paddle.jit.to_static def forward(self, x): return self._linear(x) def train(layer, loader, loss_fn, opt): for epoch_id in range(EPOCH_NUM): for batch_id, (image, label) in enumerate(loader()): out = layer(image) loss = loss_fn(out, label) loss.backward() opt.step() opt.clear_grad() print("Epoch {} batch {}: loss = {}".format( epoch_id, batch_id, np.mean(loss.numpy()))) # enable dygraph mode place = paddle.CPUPlace() paddle.disable_static(place) # 1. train & save model. # create network layer = LinearNet() loss_fn = nn.CrossEntropyLoss() adam = opt.Adam(learning_rate=0.001, parameters=layer.parameters()) # create data loader dataset = RandomDataset(BATCH_NUM * BATCH_SIZE) loader = paddle.io.DataLoader(dataset, places=place, batch_size=BATCH_SIZE, shuffle=True, drop_last=True, num_workers=2) # train train(layer, loader, loss_fn, adam) # save model_path = "linear.example.model" paddle.jit.save(layer, model_path) # 2. load model # load loaded_layer = paddle.jit.load(model_path) # inference loaded_layer.eval() x = paddle.randn([1, IMAGE_SIZE], 'float32') pred = loaded_layer(x) # fine-tune loaded_layer.train() adam = opt.Adam(learning_rate=0.001, parameters=loaded_layer.parameters()) train(loaded_layer, loader, loss_fn, adam) 2. Load model saved by :ref:`api_fluid_io_save_inference_model` then performing and fine-tune training. .. code-block:: python import numpy as np import paddle import paddle.fluid as fluid import paddle.nn as nn import paddle.optimizer as opt BATCH_SIZE = 16 BATCH_NUM = 4 EPOCH_NUM = 4 IMAGE_SIZE = 784 CLASS_NUM = 10 # define a random dataset class RandomDataset(paddle.io.Dataset): def __init__(self, num_samples): self.num_samples = num_samples def __getitem__(self, idx): image = np.random.random([IMAGE_SIZE]).astype('float32') label = np.random.randint(0, CLASS_NUM - 1, (1, )).astype('int64') return image, label def __len__(self): return self.num_samples image = fluid.data(name='image', shape=[None, 784], dtype='float32') label = fluid.data(name='label', shape=[None, 1], dtype='int64') pred = fluid.layers.fc(input=image, size=10, act='softmax') loss = fluid.layers.cross_entropy(input=pred, label=label) avg_loss = fluid.layers.mean(loss) optimizer = fluid.optimizer.SGD(learning_rate=0.001) optimizer.minimize(avg_loss) place = fluid.CPUPlace() exe = fluid.Executor(place) exe.run(fluid.default_startup_program()) # create data loader dataset = RandomDataset(BATCH_NUM * BATCH_SIZE) loader = paddle.io.DataLoader(dataset, feed_list=[image, label], places=place, batch_size=BATCH_SIZE, shuffle=True, drop_last=True, num_workers=2) # 1. train and save inference model for data in loader(): exe.run( fluid.default_main_program(), feed=data, fetch_list=[avg_loss]) model_path = "fc.example.model" fluid.io.save_inference_model( model_path, ["image"], [pred], exe) # 2. load model # enable dygraph mode paddle.disable_static(place) # load fc = paddle.jit.load(model_path) # inference fc.eval() x = paddle.randn([1, IMAGE_SIZE], 'float32') pred = fc(x) # fine-tune fc.train() loss_fn = nn.CrossEntropyLoss() adam = opt.Adam(learning_rate=0.001, parameters=fc.parameters()) loader = paddle.io.DataLoader(dataset, places=place, batch_size=BATCH_SIZE, shuffle=True, drop_last=True, num_workers=2) for epoch_id in range(EPOCH_NUM): for batch_id, (image, label) in enumerate(loader()): out = fc(image) loss = loss_fn(out, label) loss.backward() adam.step() adam.clear_grad() print("Epoch {} batch {}: loss = {}".format( epoch_id, batch_id, np.mean(loss.numpy()))) """ return TranslatedLayer._construct(model_path, config) @dygraph_only def _trace(layer, inputs, feed_prefix='feed_', fetch_prefix='fetch_', tmp_prefix='t_'): assert isinstance(layer, Layer) if not isinstance(inputs, (list, tuple)): inputs = [inputs] tracer = _dygraph_tracer()._get_program_desc_tracer() var_list = extract_vars(inputs) with program_desc_tracing_guard(True): original_outputs = layer(*inputs) if not isinstance(original_outputs, (list, tuple)): outputs = [original_outputs] else: outputs = original_outputs out_vars = [var for var in outputs] program_desc, feed_names, fetch_names, parameters = tracer.create_program_desc( var_list, feed_prefix, out_vars, fetch_prefix, tmp_prefix) tracer.reset() with _dygraph_guard(None): program = create_program_from_desc(program_desc) return original_outputs, program, feed_names, fetch_names, parameters class TracedLayer(object): """ :api_attr: imperative TracedLayer is used to convert a forward dygraph model to a static graph model. This is mainly used to save the dygraph model for online inference using C++. Besides, users can also do inference in Python using the converted static graph model, which usually has better performance than the original dygraph model. TracedLayer would run the static graph model using :code:`Executor` and :code:`CompiledProgram` . The static graph model would share parameters with the dygraph model. All TracedLayer objects should not be created by constructor and should be created by static method :code:`TracedLayer.trace(layer, inputs)` . The TracedLayer can only be used to convert the data-independent dygraph model into the static graph model, which means the dygraph model should be independent with the tensor data and shape. """ def __init__(self, program, parameters, feed_names, fetch_names): self._program = program self._feed_names = feed_names self._fetch_names = fetch_names self._params = parameters self._place = _current_expected_place() self._scope = core.Scope() for p in parameters: src_tensor = p.value().get_tensor() dst_tensor = self._scope.var(p.name).get_tensor() dst_tensor._share_data_with(src_tensor) self._exe = Executor(self._place) self._compiled_program = None self._build_strategy = None self._exec_strategy = None @property def program(self): return self._program def _switch(self, is_test=True): for block_id in range(self._program.num_blocks): block = self._program.block(block_id) for op in block.ops: if op.has_attr("is_test"): op._set_attr("is_test", is_test) @staticmethod @dygraph_only def trace(layer, inputs): """ This method is the only allowed method to create TracedLayer object. It would call the :code:`layer(*inputs)` method to run the dygraph model and convert it into a static graph model. Args: layer (dygraph.Layer): the layer object to be traced. inputs (list(Tensor)|tuple(Tensor)|Tensor): the input tensors of the layer object. Returns: tuple: A tuple of 2 items, whose the first item is the output of :code:`layer(*inputs)` , and the second item is the created TracedLayer object. Examples: .. code-block:: python: import paddle.fluid as fluid from paddle.fluid.dygraph import Linear, to_variable, TracedLayer import numpy as np class ExampleLayer(fluid.dygraph.Layer): def __init__(self): super(ExampleLayer, self).__init__() self._fc = Linear(3, 10) def forward(self, input): return self._fc(input) with fluid.dygraph.guard(): layer = ExampleLayer() in_np = np.random.random([2, 3]).astype('float32') in_var = to_variable(in_np) out_dygraph, static_layer = TracedLayer.trace(layer, inputs=[in_var]) # run the static graph model using Executor inside out_static_graph = static_layer([in_var]) print(len(out_static_graph)) # 1 print(out_static_graph[0].shape) # (2, 10) # save the static graph model for inference static_layer.save_inference_model(dirname='./saved_infer_model') """ assert isinstance( layer, Layer ), "The type of 'layer' in fluid.dygraph.jit.TracedLayer.trace must be fluid.dygraph.Layer, but received {}.".format( type(layer)) outs, prog, feed, fetch, parameters = _trace(layer, inputs) traced = TracedLayer(prog, parameters, feed, fetch) return outs, traced def set_strategy(self, build_strategy=None, exec_strategy=None): """ Set the strategies when running static graph model. Args: build_strategy (BuildStrategy, optional): build strategy of :code:`CompiledProgram` inside TracedLayer. Default None. exec_strategy (ExecutionStrategy, optional): execution strategy of :code:`CompiledProgram` inside TracedLayer. Default None. Returns: None Examples: .. code-block:: python: import paddle.fluid as fluid from paddle.fluid.dygraph import Linear, to_variable, TracedLayer import numpy as np class ExampleLayer(fluid.dygraph.Layer): def __init__(self): super(ExampleLayer, self).__init__() self._fc = Linear(3, 10) def forward(self, input): return self._fc(input) with fluid.dygraph.guard(): layer = ExampleLayer() in_np = np.random.random([2, 3]).astype('float32') in_var = to_variable(in_np) out_dygraph, static_layer = TracedLayer.trace(layer, inputs=[in_var]) build_strategy = fluid.BuildStrategy() build_strategy.enable_inplace = True exec_strategy = fluid.ExecutionStrategy() exec_strategy.num_threads = 2 static_layer.set_strategy(build_strategy=build_strategy, exec_strategy=exec_strategy) out_static_graph = static_layer([in_var]) """ assert self._compiled_program is None, "Cannot set strategy after run" assert isinstance( build_strategy, (type(None), BuildStrategy) ), "The type of 'build_strategy' in fluid.dygraph.jit.TracedLayer.set_strategy must be fluid.BuildStrategy, but received {}.".format( type(build_strategy)) assert isinstance( exec_strategy, (type(None), ExecutionStrategy) ), "The type of 'exec_strategy' in fluid.dygraph.jit.TracedLayer.set_strategy must be fluid.ExecutionStrategy, but received {}.".format( type(exec_strategy)) self._build_strategy = build_strategy self._exec_strategy = exec_strategy @switch_to_static_graph def _compile(self): self._compiled_program = CompiledProgram( self._program).with_data_parallel( build_strategy=self._build_strategy, exec_strategy=self._exec_strategy, places=self._place) def _build_feed(self, inputs): assert isinstance(inputs, (list, tuple)), \ "Inputs should be a list or tuple of variables" assert len(inputs) == len(self._feed_names) feed_dict = {} if in_dygraph_mode(): for x, name in zip(inputs, self._feed_names): feed_dict[name] = x.value().get_tensor() else: for x, name in zip(inputs, self._feed_names): feed_dict[name] = x return feed_dict @switch_to_static_graph def _run(self, feed): return self._exe.run(self._compiled_program, feed=feed, fetch_list=self._fetch_names) def __call__(self, inputs): with scope_guard(self._scope): if self._compiled_program is None: self._compile() return self._run(self._build_feed(inputs)) @switch_to_static_graph def save_inference_model(self, dirname, feed=None, fetch=None): """ Save the TracedLayer to a model for inference. The saved inference model can be loaded by C++ inference APIs. Args: dirname (str): the directory to save the inference model. feed (list[int], optional): the input variable indices of the saved inference model. If None, all input variables of the TracedLayer object would be the inputs of the saved inference model. Default None. fetch (list[int], optional): the output variable indices of the saved inference model. If None, all output variables of the TracedLayer object would be the outputs of the saved inference model. Default None. Returns: None Examples: .. code-block:: python: import paddle.fluid as fluid from paddle.fluid.dygraph import Linear, to_variable, TracedLayer import numpy as np class ExampleLayer(fluid.dygraph.Layer): def __init__(self): super(ExampleLayer, self).__init__() self._fc = Linear(3, 10) def forward(self, input): return self._fc(input) save_dirname = './saved_infer_model' in_np = np.random.random([2, 3]).astype('float32') with fluid.dygraph.guard(): layer = ExampleLayer() in_var = to_variable(in_np) out_dygraph, static_layer = TracedLayer.trace(layer, inputs=[in_var]) static_layer.save_inference_model(save_dirname, feed=[0], fetch=[0]) place = fluid.CPUPlace() exe = fluid.Executor(place) program, feed_vars, fetch_vars = fluid.io.load_inference_model(save_dirname, exe) fetch, = exe.run(program, feed={feed_vars[0]: in_np}, fetch_list=fetch_vars) print(fetch.shape) # (2, 10) """ check_type(dirname, "dirname", str, "fluid.dygraph.jit.TracedLayer.save_inference_model") check_type(feed, "feed", (type(None), list), "fluid.dygraph.jit.TracedLayer.save_inference_model") if isinstance(feed, list): for f in feed: check_type(f, "each element of feed", int, "fluid.dygraph.jit.TracedLayer.save_inference_model") check_type(fetch, "fetch", (type(None), list), "fluid.dygraph.jit.TracedLayer.save_inference_model") if isinstance(fetch, list): for f in fetch: check_type(f, "each element of fetch", int, "fluid.dygraph.jit.TracedLayer.save_inference_model") from paddle.fluid.io import save_inference_model def get_feed_fetch(all_vars, partial_vars): if partial_vars is None: return all_vars return [all_vars[idx] for idx in partial_vars] with scope_guard(self._scope): feeded_var_names = get_feed_fetch(self._feed_names, feed) target_var_names = get_feed_fetch(self._fetch_names, fetch) target_vars = [] for name in target_var_names: target_var = self._program.global_block().vars.get(name, None) assert target_var is not None, "{} cannot be found".format(name) target_vars.append(target_var) save_inference_model( dirname=dirname, feeded_var_names=feeded_var_names, target_vars=target_vars, executor=self._exe, main_program=self._program.clone())