# 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. import multiprocessing import os import six import sys from .. import compat as cpt from . import core __all__ = ['CompiledProgram', 'ExecutionStrategy', 'BuildStrategy'] ExecutionStrategy = core.ParallelExecutor.ExecutionStrategy BuildStrategy = core.ParallelExecutor.BuildStrategy InferNativeConfig = core.NativeConfig InferAnalysisConfig = core.AnalysisConfig def _place_obj(place): p = core.Place() p.set_place(place) return p class CompiledProgram(object): """ Compiles a Program for execution. 1. Users first create the program with layers. 2. Optionally, users use CompiledProgram to optimize the program before run. 3. The original program or CompiledProgram is run by executor. The CompiledProgram is used to transform a program for various optimizations, for example. * Pre-compute some logic once so that each run is faster. * Transform the program so that it can run in multiple devices. * TODO: transform the program for optimized inference or distributed training. Example: .. code-block:: python place = fluid.CUDAPlace(0) if use_cuda else fluid.CPUPlace() exe = fluid.Executor(place) exe.run(startup) compiled_prog = compiler.CompiledProgram(main).with_data_parallel( loss_name=loss.name) for i in range(5): test_loss, = exe.run(compiled_prog, feed=feed_dict, fetch_list=[loss.name]) Args: program: Program instance that contains the model logic. """ def __init__(self, program): self._program = program self._scope = None self._place = None self._executor = None self._compiled = False self._is_data_parallel = False self._is_inference = False def with_data_parallel(self, loss_name=None, build_strategy=None, exec_strategy=None, share_vars_from=None): """Configs the program to run in data parallel way. Args: loss_name (str): The loss name must set in training. Default None. build_strategy(BuildStrategy): build_strategy is used to build the graph so it can run on multiple devices/cores with optimized topology. For more information, please refer to fluid.BuildStrategy. Default None. exec_strategy(ExecutionStrategy): exec_strategy is used to to select the a way to execute the graph, for example how many threads are used, how many iterations to clean up the temp variables. For more information, please refer to fluid.ExecutionStrategy. Default None. share_vars_from(CompiledProgram): If provide, this CompiledProgram will share variables from `share_vars_from`. `share_vars_from` must be run by the executor before this CompiledProgram so that vars are ready. Returns: self """ assert not self._is_data_parallel, "Already compiled with parallel." self._is_data_parallel = True self._build_strategy = build_strategy self._exec_strategy = exec_strategy self._loss_name = loss_name self._share_vars_from = share_vars_from if self._exec_strategy is None: self._exec_strategy = ExecutionStrategy() if self._build_strategy is None: self._build_strategy = BuildStrategy() return self def with_inference_optimize(self, config): """ Add inference optimize Args: config: instance of `NativeConfig` or `AnalysisConfig` to create predictor Returns: self """ assert any([ isinstance(config, InferNativeConfig), isinstance(config, InferAnalysisConfig) ]) self._is_data_parallel = False self._is_inference = True self._infer_config = config return self def _with_distributed(self): raise NotImplementedError() def _compile_data_parallel(self): if self._share_vars_from: if self._scope: sys.stderr.write("share_vars_from is set, scope is ignored.\n") if not self._share_vars_from._is_data_parallel: raise ValueError("share_vars_from is not data parallel. Cannot " "share vars from it.") if self._share_vars_from._executor is None: raise ValueError( "share_vars_from is not compiled and run, so there is no " "var to share.") self._local_scopes = self._share_vars_from._executor.local_scopes() else: self._local_scopes = [] self._exec_strategy.use_cuda = isinstance(self._place, core.CUDAPlace) if self._exec_strategy.use_cuda: gpus_env = os.getenv("FLAGS_selected_gpus") if gpus_env: gpus = [int(s) for s in gpus_env.split(",")] else: gpus = [ i for i in six.moves.range(core.get_cuda_device_count()) ] self._places = [core.CUDAPlace(i) for i in gpus] else: cpu_num = int( os.environ.get('CPU_NUM', multiprocessing.cpu_count())) self._places = [core.CPUPlace() for _ in six.moves.range(cpu_num)] assert self._places, "no place for execution" if self._exec_strategy.num_threads == 0: if self._exec_strategy.use_cuda: # Experiments on se-resnext shows that too many threads hurt # performance. Worth tunning for other models in the future. self._exec_strategy.num_threads = len(self._places) * 4 else: cpu_num = int( os.environ.get('CPU_NUM', multiprocessing.cpu_count())) self._exec_strategy.num_threads = cpu_num * 2 trainers_endpoints = self._program._trainers_endpoints # FIXME(dzhwinter): enable_inplace should be after memory_optimize # if turn on python memory optimize, turn off the inplace_pass. if self._build_strategy.memory_optimize is None: self._build_strategy.memory_optimize = False if self._program._is_mem_optimized else True if self._build_strategy.enable_inplace is None: self._build_strategy.enable_inplace = False if self._program._is_mem_optimized else True if self._build_strategy.num_trainers > 1 and trainers_endpoints: assert self._build_strategy.num_trainers == len( trainers_endpoints), "num_trainers == len(end_points)" self._build_strategy.trainers_endpoints = trainers_endpoints self._persistable_vars = set([ cpt.to_text(v.name) for v in [ var for var in self._program.list_vars() if var.persistable and var.type != core.VarDesc.VarType.RAW ] ]) places = list(map(_place_obj, self._places)) return core.ParallelExecutor( places, self._persistable_vars, self._program.desc, cpt.to_text(self._loss_name) if self._loss_name else six.u(''), self._scope, self._local_scopes, self._exec_strategy, self._build_strategy) def _compile_inference(self): assert self._is_data_parallel is False return core.create_paddle_predictor(self._infer_config) def _compile(self, scope, place): """Compile the program based on the configs. Args: scope: The variables (resources) that are associated with this compiled program. place: The location that the compiled program will be run on. Returns: self """ if self._compiled: if scope and self._scope != scope: raise ValueError("Cannot compile with different scope") if place and not self._place._equals(place): raise ValueError("Cannot compile with different place") return self self._compiled = True self._scope = scope self._place = place if self._is_data_parallel: self._executor = self._compile_data_parallel() elif self._is_inference: self._executor = self._compile_inference() else: p = _place_obj(self._place) self._executor = core.Executor(p) return self