# 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 os import time import shutil from paddle.fluid.evaluator import Evaluator from paddle.fluid.framework import Program, Parameter, default_main_program, Variable from . import core __all__ = [ 'save_vars', 'save_params', 'save_persistables', 'load_vars', 'load_params', 'load_persistables', 'save_inference_model', 'load_inference_model', 'get_inference_program', 'save_checkpoint', 'load_checkpoint', 'clean_checkpoint', 'load_persist_vars_without_grad', 'save_persist_vars_without_grad', 'get_latest_checkpoint_serial' ] def is_parameter(var): """Check whether the variable is a Parameter. This function checks whether the input variable is a Parameter. Args: var : The input variable. Returns: boolean result whether the variable is a Parameter. """ return isinstance(var, Parameter) def is_persistable(var): if var.desc.type() == core.VarDesc.VarType.FEED_MINIBATCH or \ var.desc.type() == core.VarDesc.VarType.FETCH_LIST: return False return var.persistable def _clone_var_in_block_(block, var): assert isinstance(var, Variable) return block.create_var( name=var.name, shape=var.shape, dtype=var.dtype, type=var.type, lod_level=var.lod_level, persistable=True) def save_vars(executor, dirname, main_program=None, vars=None, predicate=None, filename=None): """ Save variables to directory by executor. :param executor: executor that save variable :param dirname: directory path :param main_program: program. If vars is None, then filter all variables in this program which fit `predicate`. Default default_main_program. :param predicate: The Predicate describes a callable that returns a variable as a bool. If it returns true, the corresponding input variable will be saved. :param vars: variables need to be saved. If vars is specified, program & predicate will be ignored :param filename: The name of a single file that all vars are saved to. If it is None, save variables to separate files. :return: None """ if vars is None: if main_program is None: main_program = default_main_program() if not isinstance(main_program, Program): raise TypeError("program should be as Program type or None") save_vars( executor, dirname=dirname, vars=filter(predicate, main_program.list_vars()), filename=filename) else: save_program = Program() save_block = save_program.global_block() save_var_map = {} for each_var in vars: # NOTE: don't save the variable which type is RAW if each_var.type == core.VarDesc.VarType.RAW: continue new_var = _clone_var_in_block_(save_block, each_var) if filename is None: save_block.append_op( type='save', inputs={'X': [new_var]}, outputs={}, attrs={'file_path': os.path.join(dirname, new_var.name)}) else: save_var_map[new_var.name] = new_var if filename is not None: save_var_list = [] for name in sorted(save_var_map.keys()): save_var_list.append(save_var_map[name]) save_block.append_op( type='save_combine', inputs={'X': save_var_list}, outputs={}, attrs={'file_path': os.path.join(dirname, filename)}) executor.run(save_program) def save_params(executor, dirname, main_program=None, filename=None): """ Save all parameters to directory with executor. """ save_vars( executor, dirname=dirname, main_program=main_program, vars=None, predicate=is_parameter, filename=filename) def save_persistables(executor, dirname, main_program=None, filename=None): """ Save all persistables to directory with executor. """ save_vars( executor, dirname=dirname, main_program=main_program, vars=None, predicate=is_persistable, filename=filename) def load_vars(executor, dirname, main_program=None, vars=None, predicate=None, filename=None): """ Load variables from directory by executor. :param executor: executor that load variable :param dirname: directory path :param main_program: program. If vars is None, then filter all variables in this program which fit `predicate`. Default default_main_program(). :param predicate: The Predicate describes a callable that returns a variable as a bool. If it returns true, the corresponding input variable will be loaded. :param vars: variables need to be loaded. If vars is specified, program & predicate will be ignored :param filename: The name of the single file that all vars are loaded from. If it is None, load variables from separate files. :return: None """ if vars is None: if main_program is None: main_program = default_main_program() if not isinstance(main_program, Program): raise TypeError("program's type should be Program") load_vars( executor, dirname=dirname, vars=filter(predicate, main_program.list_vars()), filename=filename) else: load_prog = Program() load_block = load_prog.global_block() load_var_map = {} for each_var in vars: assert isinstance(each_var, Variable) if each_var.type == core.VarDesc.VarType.RAW: continue new_var = _clone_var_in_block_(load_block, each_var) if filename is None: load_block.append_op( type='load', inputs={}, outputs={'Out': [new_var]}, attrs={'file_path': os.path.join(dirname, new_var.name)}) else: load_var_map[new_var.name] = new_var if filename is not None: load_var_list = [] for name in sorted(load_var_map.keys()): load_var_list.append(load_var_map[name]) load_block.append_op( type='load_combine', inputs={}, outputs={"Out": load_var_list}, attrs={'file_path': os.path.join(dirname, filename)}) executor.run(load_prog) def load_params(executor, dirname, main_program=None, filename=None): """ load all parameters from directory by executor. """ load_vars( executor, dirname=dirname, main_program=main_program, predicate=is_parameter, filename=filename) def load_persistables(executor, dirname, main_program=None, filename=None): """ load all persistables from directory by executor. """ load_vars( executor, dirname=dirname, main_program=main_program, predicate=is_persistable, filename=filename) def get_inference_program(target_vars, main_program=None): if main_program is None: main_program = default_main_program() if not isinstance(target_vars, list): target_vars = [target_vars] vars = [] for var in target_vars: if isinstance(var, Evaluator): vars.extend(var.states) vars.extend(var.metrics) else: vars.append(var) pruned_program = main_program.prune(targets=vars) inference_program = pruned_program.inference_optimize() return inference_program def prepend_feed_ops(inference_program, feed_target_names, feed_holder_name='feed'): if len(feed_target_names) == 0: return global_block = inference_program.global_block() feed_var = global_block.create_var( name=feed_holder_name, type=core.VarDesc.VarType.FEED_MINIBATCH, persistable=True) for i, name in enumerate(feed_target_names): out = global_block.var(name) global_block.prepend_op( type='feed', inputs={'X': [feed_var]}, outputs={'Out': [out]}, attrs={'col': i}) def append_fetch_ops(inference_program, fetch_target_names, fetch_holder_name='fetch'): global_block = inference_program.global_block() fetch_var = global_block.create_var( name=fetch_holder_name, type=core.VarDesc.VarType.FETCH_LIST, persistable=True) for i, name in enumerate(fetch_target_names): global_block.append_op( type='fetch', inputs={'X': [name]}, outputs={'Out': [fetch_var]}, attrs={'col': i}) def save_inference_model(dirname, feeded_var_names, target_vars, executor, main_program=None, model_filename=None, params_filename=None): """ Build a model especially for inference, and save it to directory by the executor. :param dirname: directory path :param feeded_var_names: Names of variables that need to be feeded data during inference :param target_vars: Variables from which we can get inference results. :param executor: executor that save inference model :param main_program: original program, which will be pruned to build the inference model. Default default_main_program(). :param model_filename: The name of file to save inference program. If not specified, default filename `__model__` will be used. :param params_filename: The name of file to save parameters. It is used for the case that all parameters are saved in a single binary file. If not specified, parameters are considered saved in separate files. :return: None """ if isinstance(feeded_var_names, basestring): feeded_var_names = [feeded_var_names] else: if len(feeded_var_names) > 0: if not (bool(feeded_var_names) and all( isinstance(name, basestring) for name in feeded_var_names)): raise ValueError("'feed_var_names' should be a list of str.") if isinstance(target_vars, Variable): target_vars = [target_vars] else: if not (bool(target_vars) and all( isinstance(var, Variable) for var in target_vars)): raise ValueError("'target_vars' should be a list of Variable.") if main_program is None: main_program = default_main_program() copy_program = main_program.clone() if not os.path.isdir(dirname): os.makedirs(dirname) # Clear the is_target information and remove the existed feed and fetch op global_block = copy_program.global_block() for i, op in enumerate(global_block.ops): op.desc.set_is_target(False) if op.type == "feed" or op.type == "fetch": global_block.remove_op(i) copy_program.desc.flush() pruned_program = copy_program.prune(targets=target_vars) inference_program = pruned_program.inference_optimize() fetch_var_names = [v.name for v in target_vars] prepend_feed_ops(inference_program, feeded_var_names) append_fetch_ops(inference_program, fetch_var_names) if model_filename is not None: model_filename = os.path.basename(model_filename) else: model_filename = "__model__" model_filename = os.path.join(dirname, model_filename) if params_filename is not None: params_filename = os.path.basename(params_filename) with open(model_filename, "wb") as f: f.write(inference_program.desc.serialize_to_string()) save_persistables(executor, dirname, inference_program, params_filename) def load_inference_model(dirname, executor, model_filename=None, params_filename=None): """ Load inference model from a directory :param dirname: directory path :param executor: executor that load inference model :param model_filename: The name of file to load inference program. If not specified, default filename `__model__` will be used. :param params_filename: The name of file to load parameters. It is used for the case that all parameters are saved in a single binary file. If not specified, parameters are considered saved in separate files. :return: [program, feed_target_names, fetch_targets] program: program especially for inference. feed_target_names: Names of variables that need to feed data fetch_targets: Variables from which we can get inference results. """ if not os.path.isdir(dirname): raise ValueError("There is no directory named '%s'", dirname) if model_filename is not None: model_filename = os.path.basename(model_filename) else: model_filename = "__model__" model_filename = os.path.join(dirname, model_filename) if params_filename is not None: params_filename = os.path.basename(params_filename) with open(model_filename, "rb") as f: program_desc_str = f.read() program = Program.parse_from_string(program_desc_str) load_persistables(executor, dirname, program, params_filename) feed_target_names = program.desc.get_feed_target_names() fetch_target_names = program.desc.get_fetch_target_names() fetch_targets = [ program.global_block().var(name) for name in fetch_target_names ] return [program, feed_target_names, fetch_targets] def get_parameter_value(para, executor): """ Get the LoDTensor for the parameter :param executor: executor for retrieving the value :param para: the given parameter :return: the LoDTensor for the parameter """ assert is_parameter(para) get_program = Program() block = get_program.global_block() new_var = _clone_var_in_block_(block, para) return executor.run(get_program, feed={}, fetch_list=[new_var])[0] def get_parameter_value_by_name(name, executor, program=None): """ Get the LoDTensor for paramter with the given name :param executor: executor for retrieving the value :param name: the name of the parameter :param program: the program where the variable is found Default default_main_program(). :return: the LoDTensor for the variable """ if program is None: program = default_main_program() var = program.global_block().var(name) return get_parameter_value(var, executor) SUCCESS_MARK_FILENAME = "_SUCCESS" CHECKPOINT_PREFIX = "checkpoint" MODEL_DIR = "__model__" TRAINER_PREFIX = "trainer" CHECKPOINT_SEPARATOR = "_" def save_checkpoint(executor, checkpoint_dir, trainer_id, is_chief=False, trainer_args=None, main_program=None, max_num_checkpoints=3): """ Save Checkpoint will save persistable LodTensor variables from main_program in checkpoint directory, the directory named by serial number from 0 to (n -1), save_checkpoint use LRU strategy to keep numbers of checkpoint directory, the numbers of checkpoint directory are max_num_checkpoints at most, The interval between two saved checkpoints must greater than save_interval_secs. :param executor executor for save the value :param checkpoint_dir the checkpoint directory :param trainer_id currect trainer id :param is_chief if the trainer id equals 0, the is_chief will be true :param main_program will save all variables in program :param max_num_checkpoints will keep numbers of checkpoint serials not bigger than max_num_checkpoints """ if checkpoint_dir is None: raise ValueError("'checkpoint_dir' should not be None") if trainer_args: assert isinstance(trainer_args, dict) if not os.path.isdir(checkpoint_dir): os.makedirs(checkpoint_dir) serial = get_latest_checkpoint_serial(checkpoint_dir) + 1 cur_dir = _get_serial_dir(checkpoint_dir, serial) save_trainer_args(cur_dir, trainer_id, trainer_args) if is_chief: save_persist_vars_without_grad(executor, cur_dir, main_program) _scroll_delete(checkpoint_dir, max_num_checkpoints) def load_checkpoint(executor, checkpoint_dir, serial, main_program): """ Load checkpoint from a directory by executor, it will find the most recent saved checkpoint file and load it auto. :param executor executor for load the value :param checkpoint_dir the checkpoint directory :param serial the serial folder in checkpoint directory will be load :param main_program will load all variables in program """ if checkpoint_dir is None: raise ValueError("'checkpoint_dir' should not be None") if serial is None or serial < 0: raise ValueError("'serial' should not be None or <0 ") if main_program is None: raise ValueError('main_program should not be None.') cur_dir = _get_serial_dir(checkpoint_dir, serial) load_persist_vars_without_grad(executor, cur_dir, main_program, True) def clean_checkpoint(checkpoint_dir, delete_dir=False): """ clean the checkpoint dir, when the train exits normally, the trainer will call clean_checkpoint to delete checkpoint directory saved before. delete_dir only works when the directory is empty, otherwise, OSError is raised. :param checkpoint_dir :param delete_dir """ if checkpoint_dir is None: raise ValueError("'checkpoint_dir' should not be None") _scroll_delete(checkpoint_dir, max_num_checkpoints=0) if delete_dir and not os.listdir(checkpoint_dir): os.rmdir(checkpoint_dir) def load_persist_vars_without_grad(executor, dirname, program, has_model_dir=False): """ load_persist_vars_without_grad will load variables from a directory by an executor, the variable named end with "@GRAD" will not be loaded. :param executor executor for load the value :param dirname the checkpoint directory :param program will load all variables in program :param has_model_dir if has_model_dir is True, will load variables from sub directory named __model__ """ if has_model_dir: dirname = _get_model_dir(dirname) load_vars( executor, dirname=dirname, main_program=program, predicate=_is_checkpoint_var, filename=None) def save_persist_vars_without_grad(executor, dirname, program): """ save_persist_vars_without_grad will save variables to a directory by an executor, the variable named end with "@GRAD" will not be saved. :param executor executor for load the value :param dirname the checkpoint directory :param program will load all variables in program """ cur_dir = _get_model_dir(dirname) save_vars( executor, dirname=cur_dir, main_program=program, vars=None, predicate=_is_checkpoint_var, filename=None) _write_success(cur_dir) def save_trainer_args(dirname, trainer_id, trainer_args): assert isinstance(trainer_args, dict) cur_dir = _get_trainer_dir(dirname, trainer_id) for name, value in trainer_args.iteritems(): args_file = os.path.join(cur_dir, name) with open(args_file, 'w') as f: f.write(str(value)) _write_success(cur_dir) def load_trainer_args(checkpoint_dir, serial, trainer_id, trainer_args): assert isinstance(trainer_args, list) cur_dir = _get_serial_dir(checkpoint_dir, serial) cur_dir = _get_trainer_dir(cur_dir, trainer_id) ret_values = [] for arg in trainer_args: cur_file = os.path.join(cur_dir, arg) with open(cur_file, 'r') as f: contents = f.read() ret_values.append(contents.strip()) return ret_values def _is_checkpoint_var(var): """ the checkpoint will not save or load all the variables. var type is FEED_MINIBATCH/FETCH_LIST/RAW or var name ends with @GRAD are discarded. :param var """ if var.desc.type() == core.VarDesc.VarType.FEED_MINIBATCH or \ var.desc.type() == core.VarDesc.VarType.FETCH_LIST or \ var.desc.type() == core.VarDesc.VarType.RAW: return False # @GRAD are named for gradient variables, checkpoint will not save it. if "@GRAD" in var.name: return False # .trainer_ are named for distribute train variables, checkpoint will not save it. if ".trainer_" in var.name: return False # .block is named for distribute train variables, checkpoint will not save it. if ".block" in var.name: return False return var.persistable def _get_dir_serial(dirname): _, serial = dirname.split(CHECKPOINT_SEPARATOR) try: serial_num = int(serial) except ValueError: serial_num = -1 return serial_num def _get_serial_dir(dirname, serial): serial_folder = CHECKPOINT_PREFIX + CHECKPOINT_SEPARATOR + str(serial) serial_dir = os.path.join(dirname, serial_folder) if not os.path.isdir(serial_dir): os.makedirs(serial_dir) return serial_dir def _get_model_dir(dirname): model_dir = os.path.join(dirname, MODEL_DIR) if not os.path.isdir(model_dir): os.makedirs(model_dir) return model_dir def _get_trainer_dir(dirname, trainer_id): trainer_folder = TRAINER_PREFIX + CHECKPOINT_SEPARATOR + str(trainer_id) trainer_dir = os.path.join(dirname, trainer_folder) if not os.path.isdir(trainer_dir): os.makedirs(trainer_dir) return trainer_dir def _scroll_delete(dirname, max_num_checkpoints=3): dirs = os.listdir(dirname) serial_map = {} for serial in dirs: serial_num = _get_dir_serial(serial) serial_map[serial_num] = serial if len(serial_map.keys()) <= max_num_checkpoints: return serials = serial_map.keys() serials.sort(reverse=True) serials = serials[max_num_checkpoints:] for serial in serials: cur_dir = _get_serial_dir(dirname, serial) shutil.rmtree(cur_dir) def _write_success(dirname): """ write an empty file named "_SUCCESS" in checkpoint dir, indicate this checkpoint is correct. :param dirname """ success_file = os.path.join(dirname, SUCCESS_MARK_FILENAME) with open(success_file, 'a') as f: now = time.ctime() f.write(now) def get_latest_checkpoint_serial(checkpoint_dir): """ get the latest file in checkpoint directory, the _SUCCESS file must exist in the directory :param checkpoint_dir """ if not checkpoint_dir: return -1 def has_success(checkpoint_dir, cur_dir): """ is _SUCCESS in this dir """ serial = _get_dir_serial(cur_dir) if serial == -1 or not os.path.isdir( os.path.join(checkpoint_dir, cur_dir)): return -1 success_path = os.path.join( _get_serial_dir(checkpoint_dir, serial), MODEL_DIR, SUCCESS_MARK_FILENAME) if os.path.isfile(success_path): return serial if not os.path.isdir(checkpoint_dir): return -1 current_dir = -1 dirs = os.listdir(checkpoint_dir) for cur_dir in dirs: success_num = has_success(checkpoint_dir, cur_dir) if success_num > current_dir: current_dir = success_num return current_dir