# 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 absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals import errno import os import shutil import tempfile import time import numpy as np import re import paddle.fluid as fluid from .download import get_weights_path import logging logger = logging.getLogger(__name__) __all__ = [ 'load_checkpoint', 'load_and_fusebn', 'load_params', 'save', ] def is_url(path): """ Whether path is URL. Args: path (string): URL string or not. """ return path.startswith('http://') or path.startswith('https://') def _get_weight_path(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 _load_state(path): if os.path.exists(path + '.pdopt'): # XXX another hack to ignore the optimizer state tmp = tempfile.mkdtemp() dst = os.path.join(tmp, os.path.basename(os.path.normpath(path))) shutil.copy(path + '.pdparams', dst + '.pdparams') state = fluid.io.load_program_state(dst) shutil.rmtree(tmp) else: state = fluid.io.load_program_state(path) return state 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_params(exe, prog, path, ignore_params=[]): """ Load model from the given path. Args: exe (fluid.Executor): The fluid.Executor object. prog (fluid.Program): load weight to which Program object. path (string): URL string or loca model path. ignore_params (list): ignore variable to load when finetuning. It can be specified by finetune_exclude_pretrained_params and the usage can refer to docs/advanced_tutorials/TRANSFER_LEARNING.md """ if is_url(path): path = _get_weight_path(path) path = _strip_postfix(path) if not (os.path.isdir(path) or os.path.exists(path + '.pdparams')): raise ValueError("Model pretrain path {} does not " "exists.".format(path)) logger.info('Loading parameters from {}...'.format(path)) ignore_set = set() state = _load_state(path) # ignore the parameter which mismatch the shape # between the model and pretrain weight. all_var_shape = {} for block in prog.blocks: for param in block.all_parameters(): all_var_shape[param.name] = param.shape ignore_set.update([ name for name, shape in all_var_shape.items() if name in state and shape != state[name].shape ]) if ignore_params: all_var_names = [var.name for var in prog.list_vars()] ignore_list = filter( lambda var: any([re.match(name, var) for name in ignore_params]), all_var_names) ignore_set.update(list(ignore_list)) if len(ignore_set) > 0: for k in ignore_set: if k in state: logger.warning('variable {} not used'.format(k)) del state[k] fluid.io.set_program_state(prog, state) def load_checkpoint(exe, prog, path): """ Load model from the given path. Args: exe (fluid.Executor): The fluid.Executor object. prog (fluid.Program): load weight to which Program object. path (string): URL string or loca model path. """ if is_url(path): path = _get_weight_path(path) path = _strip_postfix(path) if not (os.path.isdir(path) or os.path.exists(path + '.pdparams')): raise ValueError("Model pretrain path {} does not " "exists.".format(path)) fluid.load(prog, path, executor=exe) def global_step(scope=None): """ Load global step in scope. Args: scope (fluid.Scope): load global step from which scope. If None, from default global_scope(). Returns: global step: int. """ if scope is None: scope = fluid.global_scope() v = scope.find_var('@LR_DECAY_COUNTER@') step = np.array(v.get_tensor())[0] if v else 0 return step def save(exe, prog, path): """ Load model from the given path. Args: exe (fluid.Executor): The fluid.Executor object. prog (fluid.Program): save weight from which Program object. path (string): the path to save model. """ if os.path.isdir(path): shutil.rmtree(path) logger.info('Save model to {}.'.format(path)) fluid.save(prog, path) def load_and_fusebn(exe, prog, path): """ Fuse params of batch norm to scale and bias. Args: exe (fluid.Executor): The fluid.Executor object. prog (fluid.Program): save weight from which Program object. path (string): the path to save model. """ logger.info('Load model and fuse batch norm if have from {}...'.format( path)) if is_url(path): path = _get_weight_path(path) if not os.path.exists(path): raise ValueError("Model path {} does not exists.".format(path)) # Since the program uses affine-channel, there is no running mean and var # in the program, here append running mean and var. # NOTE, the params of batch norm should be like: # x_scale # x_offset # x_mean # x_variance # x is any prefix mean_variances = set() bn_vars = [] state = _load_state(path) def check_mean_and_bias(prefix): m = prefix + 'mean' v = prefix + 'variance' return v in state and m in state has_mean_bias = True with fluid.program_guard(prog, fluid.Program()): for block in prog.blocks: ops = list(block.ops) if not has_mean_bias: break for op in ops: if op.type == 'affine_channel': # remove 'scale' as prefix scale_name = op.input('Scale')[0] # _scale bias_name = op.input('Bias')[0] # _offset prefix = scale_name[:-5] mean_name = prefix + 'mean' variance_name = prefix + 'variance' if not check_mean_and_bias(prefix): has_mean_bias = False break bias = block.var(bias_name) mean_vb = block.create_var( name=mean_name, type=bias.type, shape=bias.shape, dtype=bias.dtype) variance_vb = block.create_var( name=variance_name, type=bias.type, shape=bias.shape, dtype=bias.dtype) mean_variances.add(mean_vb) mean_variances.add(variance_vb) bn_vars.append( [scale_name, bias_name, mean_name, variance_name]) if not has_mean_bias: fluid.io.set_program_state(prog, state) logger.warning( "There is no paramters of batch norm in model {}. " "Skip to fuse batch norm. And load paramters done.".format(path)) return fluid.load(prog, path, exe) eps = 1e-5 for names in bn_vars: scale_name, bias_name, mean_name, var_name = names scale = fluid.global_scope().find_var(scale_name).get_tensor() bias = fluid.global_scope().find_var(bias_name).get_tensor() mean = fluid.global_scope().find_var(mean_name).get_tensor() var = fluid.global_scope().find_var(var_name).get_tensor() scale_arr = np.array(scale) bias_arr = np.array(bias) mean_arr = np.array(mean) var_arr = np.array(var) bn_std = np.sqrt(np.add(var_arr, eps)) new_scale = np.float32(np.divide(scale_arr, bn_std)) new_bias = bias_arr - mean_arr * new_scale # fuse to scale and bias in affine_channel scale.set(new_scale, exe.place) bias.set(new_bias, exe.place)