389 lines
13 KiB
Python
Executable File
389 lines
13 KiB
Python
Executable File
import math
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import os
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import time
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import copy
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import psutil
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import torch
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from utils.logger import get_logger
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from utils.loss_function import all_metrics
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from tqdm import tqdm
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class TrainingStats:
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"""记录训练过程中的统计信息"""
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def __init__(self, device):
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self.device = device
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self.reset()
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def reset(self):
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"""重置所有统计数据"""
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self.gpu_mem_usage_list = []
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self.cpu_mem_usage_list = []
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self.train_time_list = []
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self.infer_time_list = []
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self.total_iters = 0
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self.start_time = None
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self.end_time = None
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def start_training(self):
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"""记录训练开始时间"""
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self.start_time = time.time()
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def end_training(self):
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"""记录训练结束时间"""
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self.end_time = time.time()
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def record_step_time(self, duration, mode):
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"""记录单步耗时和总迭代次数"""
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if mode == "train":
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self.train_time_list.append(duration)
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else:
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self.infer_time_list.append(duration)
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self.total_iters += 1
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def record_memory_usage(self):
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"""记录当前 GPU 和 CPU 内存占用"""
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process = psutil.Process(os.getpid())
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cpu_mem = process.memory_info().rss / (1024**2)
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if torch.cuda.is_available():
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gpu_mem = torch.cuda.max_memory_allocated(device=self.device) / (1024**2)
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torch.cuda.reset_peak_memory_stats(device=self.device)
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else:
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gpu_mem = 0.0
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self.cpu_mem_usage_list.append(cpu_mem)
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self.gpu_mem_usage_list.append(gpu_mem)
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def _calculate_average(self, values_list):
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"""安全计算平均值，避免除零错误"""
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return sum(values_list) / len(values_list) if values_list else 0
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def report(self, logger):
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"""在训练结束时输出汇总统计"""
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if not self.start_time or not self.end_time:
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logger.warning("TrainingStats: start/end time not recorded properly.")
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return
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total_time = self.end_time - self.start_time
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avg_gpu_mem = self._calculate_average(self.gpu_mem_usage_list)
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avg_cpu_mem = self._calculate_average(self.cpu_mem_usage_list)
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avg_train_time = self._calculate_average(self.train_time_list)
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avg_infer_time = self._calculate_average(self.infer_time_list)
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iters_per_sec = self.total_iters / total_time if total_time > 0 else 0
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logger.info("===== Training Summary =====")
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logger.info(f"Total training time: {total_time:.2f} s")
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logger.info(f"Total iterations: {self.total_iters}")
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logger.info(f"Average iterations per second: {iters_per_sec:.2f}")
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logger.info(f"Average GPU Memory Usage: {avg_gpu_mem:.2f} MB")
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logger.info(f"Average CPU Memory Usage: {avg_cpu_mem:.2f} MB")
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if avg_train_time:
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logger.info(f"Average training step time: {avg_train_time * 1000:.2f} ms")
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if avg_infer_time:
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logger.info(f"Average inference step time: {avg_infer_time * 1000:.2f} ms")
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class Trainer:
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"""模型训练器，负责整个训练流程的管理"""
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def __init__(
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self,
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model,
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loss,
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optimizer,
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train_loader,
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val_loader,
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test_loader,
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scaler,
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args,
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lr_scheduler=None,
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):
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# 设备和基本参数
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self.device = args["basic"]["device"]
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train_args = args["train"]
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# 模型和训练相关组件
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self.model = model
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self.loss = loss
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self.optimizer = optimizer
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self.lr_scheduler = lr_scheduler
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# 数据加载器
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self.train_loader = train_loader
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self.val_loader = val_loader
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self.test_loader = test_loader
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# 数据处理工具
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self.scaler = scaler
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self.args = train_args
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# 统计信息
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self.train_per_epoch = len(train_loader)
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self.val_per_epoch = len(val_loader) if val_loader else 0
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# 初始化路径、日志和统计
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self._initialize_paths(train_args)
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self._initialize_logger(train_args)
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self._initialize_stats()
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def _initialize_paths(self, args):
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"""初始化模型保存路径"""
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self.best_path = os.path.join(args["log_dir"], "best_model.pth")
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self.best_test_path = os.path.join(args["log_dir"], "best_test_model.pth")
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self.loss_figure_path = os.path.join(args["log_dir"], "loss.png")
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def _initialize_logger(self, args):
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"""初始化日志记录器"""
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if not os.path.isdir(args["log_dir"]) and not args["debug"]:
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os.makedirs(args["log_dir"], exist_ok=True)
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self.logger = get_logger(
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args["log_dir"], name=self.model.__class__.__name__, debug=args["debug"]
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)
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self.logger.info(f"Experiment log path in: {args['log_dir']}")
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def _initialize_stats(self):
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"""初始化统计信息记录器"""
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self.stats = TrainingStats(device=self.device)
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def _run_epoch(self, epoch, dataloader, mode):
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"""运行一个训练/验证/测试epoch"""
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# 设置模型模式和是否进行优化
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if mode == "train":
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self.model.train()
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optimizer_step = True
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else:
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self.model.eval()
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optimizer_step = False
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# 初始化变量
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total_loss = 0
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epoch_time = time.time()
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y_pred, y_true = [], []
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# 训练/验证循环
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with torch.set_grad_enabled(optimizer_step):
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progress_bar = tqdm(
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enumerate(dataloader),
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total=len(dataloader),
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desc=f"{mode.capitalize()} Epoch {epoch}"
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)
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for _, (data, target) in progress_bar:
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# 记录步骤开始时间
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start_time = time.time()
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# 前向传播
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label = target[..., : self.args["output_dim"]]
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output = self.model(data).to(self.device)
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loss = self.loss(output, label)
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# 反归一化
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d_output = self.scaler.inverse_transform(output)
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d_label = self.scaler.inverse_transform(label)
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# 反向传播和优化（仅在训练模式）
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if optimizer_step and self.optimizer is not None:
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self.optimizer.zero_grad()
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loss.backward()
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# 梯度裁剪（如果需要）
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if self.args["grad_norm"]:
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torch.nn.utils.clip_grad_norm_(
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self.model.parameters(), self.args["max_grad_norm"]
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)
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self.optimizer.step()
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# 反归一化的loss
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d_loss = self.loss(d_output, d_label)
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# 记录步骤时间和内存使用
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step_time = time.time() - start_time
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self.stats.record_step_time(step_time, mode)
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# 累积损失和预测结果
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total_loss += loss.item()
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y_pred.append(output.detach().cpu())
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y_true.append(label.detach().cpu())
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# 更新进度条
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progress_bar.set_postfix(loss=d_loss.item())
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# 合并所有批次的预测结果
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y_pred = torch.cat(y_pred, dim=0)
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y_true = torch.cat(y_true, dim=0)
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# 计算平均损失
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avg_loss = total_loss / len(dataloader)
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# 计算并记录指标
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mae, rmse, mape = all_metrics(
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y_pred, y_true, self.args["mae_thresh"], self.args["mape_thresh"]
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)
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self.logger.info(
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f"Epoch #{epoch:02d}: {mode.capitalize():<5} MAE:{mae:5.2f} | RMSE:{rmse:5.2f} | MAPE:{mape:7.4f} | Time: {time.time() - epoch_time:.2f} s"
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)
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# 记录内存使用情况
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self.stats.record_memory_usage()
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return avg_loss
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def train_epoch(self, epoch):
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return self._run_epoch(epoch, self.train_loader, "train")
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def val_epoch(self, epoch):
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return self._run_epoch(epoch, self.val_loader or self.test_loader, "val")
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def test_epoch(self, epoch):
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return self._run_epoch(epoch, self.test_loader, "test")
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def train(self):
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"""执行完整的训练流程"""
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# 初始化最佳模型和损失记录
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best_model, best_test_model = None, None
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best_loss, best_test_loss = float("inf"), float("inf")
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not_improved_count = 0
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# 开始训练
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self.stats.start_training()
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self.logger.info("Training process started")
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# 训练循环
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for epoch in range(1, self.args["epochs"] + 1):
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# 训练、验证和测试一个epoch
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train_epoch_loss = self.train_epoch(epoch)
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val_epoch_loss = self.val_epoch(epoch)
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test_epoch_loss = self.test_epoch(epoch)
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# 检查梯度爆炸
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if train_epoch_loss > 1e6:
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self.logger.warning("Gradient explosion detected. Ending...")
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break
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# 更新最佳验证模型
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if val_epoch_loss < best_loss:
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best_loss = val_epoch_loss
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not_improved_count = 0
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best_model = copy.deepcopy(self.model.state_dict())
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self.logger.info("Best validation model saved!")
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else:
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not_improved_count += 1
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# 检查早停条件
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if self._should_early_stop(not_improved_count):
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break
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# 更新最佳测试模型
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if test_epoch_loss < best_test_loss:
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best_test_loss = test_epoch_loss
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best_test_model = copy.deepcopy(self.model.state_dict())
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# 保存最佳模型
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if not self.args["debug"]:
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self._save_best_models(best_model, best_test_model)
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# 结束训练并输出统计信息
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self.stats.end_training()
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self.stats.report(self.logger)
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# 最终评估
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self._finalize_training(best_model, best_test_model)
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# 输出模型参数量
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self._log_model_params()
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def _should_early_stop(self, not_improved_count):
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"""检查是否满足早停条件"""
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if (
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self.args["early_stop"]
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and not_improved_count == self.args["early_stop_patience"]
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):
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self.logger.info(
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f"Validation performance didn't improve for {self.args['early_stop_patience']} epochs. Training stops."
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)
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return True
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return False
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def _save_best_models(self, best_model, best_test_model):
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"""保存最佳模型到文件"""
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torch.save(best_model, self.best_path)
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torch.save(best_test_model, self.best_test_path)
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self.logger.info(
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f"Best models saved at {self.best_path} and {self.best_test_path}"
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)
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def _log_model_params(self):
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"""输出模型可训练参数数量"""
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try:
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total_params = sum(
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p.numel() for p in self.model.parameters() if p.requires_grad
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)
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self.logger.info(f"Trainable params: {total_params}")
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except Exception:
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pass
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def _finalize_training(self, best_model, best_test_model):
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self.model.load_state_dict(best_model)
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self.logger.info("Testing on best validation model")
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self.test(self.model, self.args, self.test_loader, self.scaler, self.logger)
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self.model.load_state_dict(best_test_model)
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self.logger.info("Testing on best test model")
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self.test(self.model, self.args, self.test_loader, self.scaler, self.logger)
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@staticmethod
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def test(model, args, data_loader, scaler, logger, path=None):
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"""对模型进行评估并输出性能指标"""
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# 加载模型检查点（如果提供了路径）
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if path:
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checkpoint = torch.load(path)
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model.load_state_dict(checkpoint["state_dict"])
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model.to(args["basic"]["device"])
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# 设置为评估模式
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model.eval()
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# 收集预测和真实标签
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y_pred, y_true = [], []
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# 不计算梯度的情况下进行预测
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with torch.no_grad():
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for data, target in data_loader:
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label = target[..., : args["output_dim"]]
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output = model(data)
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y_pred.append(output)
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y_true.append(label)
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# 合并所有批次的预测结果
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if args["real_value"]:
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y_pred = scaler.inverse_transform(torch.cat(y_pred, dim=0))
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else:
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y_pred = torch.cat(y_pred, dim=0)
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y_true = torch.cat(y_true, dim=0)
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# 计算并记录每个时间步的指标
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for t in range(y_true.shape[1]):
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mae, rmse, mape = all_metrics(
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y_pred[:, t, ...],
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y_true[:, t, ...],
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args["mae_thresh"],
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args["mape_thresh"],
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)
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logger.info(
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f"Horizon {t + 1:02d}, MAE: {mae:.4f}, RMSE: {rmse:.4f}, MAPE: {mape:.4f}"
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)
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# 计算并记录平均指标
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mae, rmse, mape = all_metrics(
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y_pred, y_true, args["mae_thresh"], args["mape_thresh"]
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)
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logger.info(
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f"Average Horizon, MAE: {mae:.4f}, RMSE: {rmse:.4f}, MAPE: {mape:.4f}"
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)
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@staticmethod
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def _compute_sampling_threshold(global_step, k):
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return k / (k + math.exp(global_step / k))
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