#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve. # #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 import paddle.fluid as fluid import os import numpy as np import time import math import yaml import copy import json import utils.logging as logging from collections import OrderedDict from os import path as osp from utils.pretrain_weights import get_pretrain_weights import transforms.transforms as T import utils import __init__ def dict2str(dict_input): out = '' for k, v in dict_input.items(): try: v = round(float(v), 6) except: pass out = out + '{}={}, '.format(k, v) return out.strip(', ') class BaseAPI: def __init__(self): # 现有的CV模型都有这个属性，而这个属且也需要在eval时用到 self.num_classes = None self.labels = None if __init__.env_info['place'] == 'cpu': self.places = fluid.cpu_places() else: self.places = fluid.cuda_places() self.exe = fluid.Executor(self.places[0]) self.train_prog = None self.test_prog = None self.parallel_train_prog = None self.train_inputs = None self.test_inputs = None self.train_outputs = None self.test_outputs = None self.train_data_loader = None self.eval_metrics = None # 若模型是从inference model加载进来的，无法调用训练接口进行训练 self.trainable = True # 是否使用多卡间同步BatchNorm均值和方差 self.sync_bn = False # 当前模型状态 self.status = 'Normal' def _get_single_card_bs(self, batch_size): if batch_size % len(self.places) == 0: return int(batch_size // len(self.places)) else: raise Exception("Please support correct batch_size, \ which can be divided by available cards({}) in {}". format(__init__.env_info['num'], __init__.env_info['place'])) def build_program(self): # 构建训练网络 self.train_inputs, self.train_outputs = self.build_net(mode='train') self.train_prog = fluid.default_main_program() startup_prog = fluid.default_startup_program() # 构建预测网络 self.test_prog = fluid.Program() with fluid.program_guard(self.test_prog, startup_prog): with fluid.unique_name.guard(): self.test_inputs, self.test_outputs = self.build_net( mode='test') self.test_prog = self.test_prog.clone(for_test=True) def arrange_transforms(self, transforms, mode='train'): # 给transforms添加arrange操作 if transforms.transforms[-1].__class__.__name__.startswith('Arrange'): transforms.transforms[-1] = T.ArrangeSegmenter(mode=mode) else: transforms.transforms.append(T.ArrangeSegmenter(mode=mode)) def build_train_data_loader(self, reader, batch_size): # 初始化data_loader if self.train_data_loader is None: self.train_data_loader = fluid.io.DataLoader.from_generator( feed_list=list(self.train_inputs.values()), capacity=64, use_double_buffer=True, iterable=True) batch_size_each_gpu = self._get_single_card_bs(batch_size) generator = reader.generator( batch_size=batch_size_each_gpu, drop_last=True) self.train_data_loader.set_sample_list_generator( reader.generator(batch_size=batch_size_each_gpu), places=self.places) def net_initialize(self, startup_prog=None, pretrain_weights=None, fuse_bn=False, save_dir='.', sensitivities_file=None, eval_metric_loss=0.05): if hasattr(self, 'backbone'): backbone = self.backbone else: backbone = self.__class__.__name__ pretrain_weights = get_pretrain_weights(pretrain_weights, backbone, save_dir) if startup_prog is None: startup_prog = fluid.default_startup_program() self.exe.run(startup_prog) if pretrain_weights is not None: logging.info( "Load pretrain weights from {}.".format(pretrain_weights)) utils.utils.load_pretrain_weights(self.exe, self.train_prog, pretrain_weights, fuse_bn) # 进行裁剪 if sensitivities_file is not None: from .slim.prune_config import get_sensitivities sensitivities_file = get_sensitivities(sensitivities_file, self, save_dir) from .slim.prune import get_params_ratios, prune_program prune_params_ratios = get_params_ratios( sensitivities_file, eval_metric_loss=eval_metric_loss) prune_program(self, prune_params_ratios) self.status = 'Prune' def get_model_info(self): info = dict() info['Model'] = self.__class__.__name__ info['_Attributes'] = {} if 'self' in self.init_params: del self.init_params['self'] if '__class__' in self.init_params: del self.init_params['__class__'] info['_init_params'] = self.init_params info['_Attributes']['num_classes'] = self.num_classes info['_Attributes']['labels'] = self.labels try: primary_metric_key = list(self.eval_metrics.keys())[0] primary_metric_value = float(self.eval_metrics[primary_metric_key]) info['_Attributes']['eval_metrics'] = { primary_metric_key: primary_metric_value } except: pass if hasattr(self, 'test_transforms'): if self.test_transforms is not None: info['Transforms'] = list() for op in self.test_transforms.transforms: name = op.__class__.__name__ attr = op.__dict__ info['Transforms'].append({name: attr}) return info def save_model(self, save_dir): if not osp.isdir(save_dir): if osp.exists(save_dir): os.remove(save_dir) os.makedirs(save_dir) fluid.save(self.train_prog, osp.join(save_dir, 'model')) model_info = self.get_model_info() model_info['status'] = self.status with open( osp.join(save_dir, 'model.yml'), encoding='utf-8', mode='w') as f: yaml.dump(model_info, f) # 评估结果保存 if hasattr(self, 'eval_details'): with open(osp.join(save_dir, 'eval_details.json'), 'w') as f: json.dump(self.eval_details, f) if self.status == 'Prune': # 保存裁剪的shape shapes = {} for block in self.train_prog.blocks: for param in block.all_parameters(): pd_var = fluid.global_scope().find_var(param.name) pd_param = pd_var.get_tensor() shapes[param.name] = np.array(pd_param).shape with open( osp.join(save_dir, 'prune.yml'), encoding='utf-8', mode='w') as f: yaml.dump(shapes, f) # 模型保存成功的标志 open(osp.join(save_dir, '.success'), 'w').close() logging.info("Model saved in {}.".format(save_dir)) def train_loop(self, num_epochs, train_reader, train_batch_size, eval_reader=None, save_interval_epochs=1, log_interval_steps=10, save_dir='output', use_vdl=False): if not osp.isdir(save_dir): if osp.exists(save_dir): os.remove(save_dir) os.makedirs(save_dir) if use_vdl: from visualdl import LogWriter vdl_logdir = osp.join(save_dir, 'vdl_log') # 给transform添加arrange操作 self.arrange_transforms( transforms=train_reader.transforms, mode='train') # 构建train_data_loader self.build_train_data_loader( reader=train_reader, batch_size=train_batch_size) if eval_reader is not None: self.eval_transforms = eval_reader.transforms self.test_transforms = copy.deepcopy(eval_reader.transforms) # 获取实时变化的learning rate lr = self.optimizer._learning_rate if isinstance(lr, fluid.framework.Variable): self.train_outputs['lr'] = lr # 在多卡上跑训练 if self.parallel_train_prog is None: build_strategy = fluid.compiler.BuildStrategy() build_strategy.fuse_all_optimizer_ops = False if __init__.env_info['place'] != 'cpu' and len(self.places) > 1: build_strategy.sync_batch_norm = self.sync_bn exec_strategy = fluid.ExecutionStrategy() exec_strategy.num_iteration_per_drop_scope = 1 self.parallel_train_prog = fluid.CompiledProgram( self.train_prog).with_data_parallel( loss_name=self.train_outputs['loss'].name, build_strategy=build_strategy, exec_strategy=exec_strategy) total_num_steps = math.floor( train_reader.num_samples / train_batch_size) num_steps = 0 time_stat = list() if use_vdl: # VisualDL component log_writer = LogWriter(vdl_logdir, sync_cycle=20) train_step_component = OrderedDict() eval_component = OrderedDict() best_accuracy_key = "" best_accuracy = -1.0 best_model_epoch = 1 for i in range(num_epochs): records = list() step_start_time = time.time() for step, data in enumerate(self.train_data_loader()): outputs = self.exe.run( self.parallel_train_prog, feed=data, fetch_list=list(self.train_outputs.values())) outputs_avg = np.mean(np.array(outputs), axis=1) records.append(outputs_avg) # 训练完成剩余时间预估 current_time = time.time() step_cost_time = current_time - step_start_time step_start_time = current_time if len(time_stat) < 20: time_stat.append(step_cost_time) else: time_stat[num_steps % 20] = step_cost_time eta = ((num_epochs - i) * total_num_steps - step - 1) * np.mean(time_stat) eta_h = math.floor(eta / 3600) eta_m = math.floor((eta - eta_h * 3600) / 60) eta_s = int(eta - eta_h * 3600 - eta_m * 60) eta_str = "{}:{}:{}".format(eta_h, eta_m, eta_s) # 每间隔log_interval_steps，输出loss信息 num_steps += 1 if num_steps % log_interval_steps == 0: step_metrics = OrderedDict( zip(list(self.train_outputs.keys()), outputs_avg)) if use_vdl: for k, v in step_metrics.items(): if k not in train_step_component.keys(): with log_writer.mode('Each_Step_while_Training' ) as step_logger: train_step_component[ k] = step_logger.scalar( 'Training: {}'.format(k)) train_step_component[k].add_record(num_steps, v) logging.info( "[TRAIN] Epoch={}/{}, Step={}/{}, {}, eta={}".format( i + 1, num_epochs, step + 1, total_num_steps, dict2str(step_metrics), eta_str)) train_metrics = OrderedDict( zip(list(self.train_outputs.keys()), np.mean(records, axis=0))) logging.info('[TRAIN] Epoch {} finished, {} .'.format( i + 1, dict2str(train_metrics))) # 每间隔save_interval_epochs, 在验证集上评估和对模型进行保存 if (i + 1) % save_interval_epochs == 0 or i == num_epochs - 1: current_save_dir = osp.join(save_dir, "epoch_{}".format(i + 1)) if not osp.isdir(current_save_dir): os.makedirs(current_save_dir) if eval_reader is not None: # 检测目前仅支持单卡评估，训练数据batch大小与显卡数量之商为验证数据batch大小。 eval_batch_size = train_batch_size self.eval_metrics, self.eval_details = self.evaluate( eval_reader=eval_reader, batch_size=eval_batch_size, verbose=True, epoch_id=i + 1, return_details=True) logging.info('[EVAL] Finished, Epoch={}, {} .'.format( i + 1, dict2str(self.eval_metrics))) # 保存最优模型 best_accuracy_key = list(self.eval_metrics.keys())[0] current_accuracy = self.eval_metrics[best_accuracy_key] if current_accuracy > best_accuracy: best_accuracy = current_accuracy best_model_epoch = i + 1 best_model_dir = osp.join(save_dir, "best_model") self.save_model(save_dir=best_model_dir) if use_vdl: for k, v in self.eval_metrics.items(): if isinstance(v, list): continue if isinstance(v, np.ndarray): if v.size > 1: continue if k not in eval_component: with log_writer.mode('Each_Epoch_on_Eval_Data' ) as eval_logger: eval_component[k] = eval_logger.scalar( 'Evaluation: {}'.format(k)) eval_component[k].add_record(i + 1, v) self.save_model(save_dir=current_save_dir) logging.info( 'Current evaluated best model in eval_reader is epoch_{}, {}={}' .format(best_model_epoch, best_accuracy_key, best_accuracy))