# Copyright (c) 2020 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 absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals import errno import os import time import re import numpy as np import paddle import paddle.nn as nn from .download import get_weights_path from .logger import setup_logger logger = setup_logger(__name__) def is_url(path): """ Whether path is URL. Args: path (string): URL string or not. """ return path.startswith('http://') \ or path.startswith('https://') \ or path.startswith('ppdet://') def get_weights_path_dist(path): env = os.environ if 'PADDLE_TRAINERS_NUM' in env and 'PADDLE_TRAINER_ID' in env: trainer_id = int(env['PADDLE_TRAINER_ID']) num_trainers = int(env['PADDLE_TRAINERS_NUM']) if num_trainers <= 1: path = get_weights_path(path) else: from ppdet.utils.download import map_path, WEIGHTS_HOME weight_path = map_path(path, WEIGHTS_HOME) lock_path = weight_path + '.lock' if not os.path.exists(weight_path): try: os.makedirs(os.path.dirname(weight_path)) except OSError as e: if e.errno != errno.EEXIST: raise with open(lock_path, 'w'): # touch os.utime(lock_path, None) if trainer_id == 0: get_weights_path(path) os.remove(lock_path) else: while os.path.exists(lock_path): time.sleep(1) path = weight_path else: path = get_weights_path(path) return path def _strip_postfix(path): path, ext = os.path.splitext(path) assert ext in ['', '.pdparams', '.pdopt', '.pdmodel'], \ "Unknown postfix {} from weights".format(ext) return path def load_weight(model, weight, optimizer=None): if is_url(weight): weight = get_weights_path_dist(weight) path = _strip_postfix(weight) pdparam_path = path + '.pdparams' if not os.path.exists(pdparam_path): raise ValueError("Model pretrain path {} does not " "exists.".format(pdparam_path)) param_state_dict = paddle.load(pdparam_path) model_dict = model.state_dict() model_weight = {} incorrect_keys = 0 for key in model_dict.keys(): if key in param_state_dict.keys(): model_weight[key] = param_state_dict[key] else: logger.info('Unmatched key: {}'.format(key)) incorrect_keys += 1 assert incorrect_keys == 0, "Load weight {} incorrectly, \ {} keys unmatched, please check again.".format(weight, incorrect_keys) logger.info('Finish loading model weight parameter: {}'.format( pdparam_path)) model.set_dict(model_weight) last_epoch = 0 if optimizer is not None and os.path.exists(path + '.pdopt'): optim_state_dict = paddle.load(path + '.pdopt') # to solve resume bug, will it be fixed in paddle 2.0 for key in optimizer.state_dict().keys(): if not key in optim_state_dict.keys(): optim_state_dict[key] = optimizer.state_dict()[key] if 'last_epoch' in optim_state_dict: last_epoch = optim_state_dict.pop('last_epoch') optimizer.set_state_dict(optim_state_dict) return last_epoch def load_pretrain_weight(model, pretrain_weight, load_static_weights=False, weight_type='pretrain'): assert weight_type in ['pretrain', 'finetune'] if is_url(pretrain_weight): pretrain_weight = get_weights_path_dist(pretrain_weight) path = _strip_postfix(pretrain_weight) if not (os.path.isdir(path) or os.path.isfile(path) or os.path.exists(path + '.pdparams')): raise ValueError("Model pretrain path `{}` does not exists. " "If you don't want to load pretrain model, " "please delete `pretrain_weights` field in " "config file.".format(path)) model_dict = model.state_dict() if load_static_weights: pre_state_dict = paddle.static.load_program_state(path) param_state_dict = {} for key in model_dict.keys(): weight_name = model_dict[key].name if weight_name in pre_state_dict.keys(): logger.info('Load weight: {}, shape: {}'.format( weight_name, pre_state_dict[weight_name].shape)) param_state_dict[key] = pre_state_dict[weight_name] else: if 'backbone' in key: logger.info('Lack weight: {}, structure name: {}'.format( weight_name, key)) param_state_dict[key] = model_dict[key] model.set_dict(param_state_dict) return param_state_dict = paddle.load(path + '.pdparams') if weight_type == 'pretrain': model.backbone.set_dict(param_state_dict) else: ignore_set = set() for name, weight in model_dict.items(): if name in param_state_dict.keys(): if weight.shape != list(param_state_dict[name].shape): logger.info( '{} not used, shape {} unmatched with {} in model.'. format(name, list(param_state_dict[name].shape), weight.shape)) param_state_dict.pop(name, None) else: logger.info('Lack weight: {}'.format(name)) model.set_dict(param_state_dict) return def save_model(model, optimizer, save_dir, save_name, last_epoch): """ save model into disk. Args: model (paddle.nn.Layer): the Layer instalce to save parameters. optimizer (paddle.optimizer.Optimizer): the Optimizer instance to save optimizer states. save_dir (str): the directory to be saved. save_name (str): the path to be saved. last_epoch (int): the epoch index. """ if paddle.distributed.get_rank() != 0: return if not os.path.exists(save_dir): os.makedirs(save_dir) save_path = os.path.join(save_dir, save_name) if isinstance(model, nn.Layer): paddle.save(model.state_dict(), save_path + ".pdparams") else: assert isinstance(model, dict), 'model is not a instance of nn.layer or dict' paddle.save(model, save_path + ".pdparams") state_dict = optimizer.state_dict() state_dict['last_epoch'] = last_epoch paddle.save(state_dict, save_path + ".pdopt") logger.info("Save checkpoint: {}".format(save_dir))