""" 药店销售预测系统 - Transformer模型训练函数 """ import os import time import pandas as pd import numpy as np import torch import torch.nn as nn import torch.optim as optim from torch.utils.data import DataLoader from sklearn.preprocessing import MinMaxScaler import matplotlib.pyplot as plt from tqdm import tqdm from sklearn.metrics import mean_squared_error, mean_absolute_error, r2_score from models.transformer_model import TimeSeriesTransformer from utils.data_utils import prepare_data, PharmacyDataset, prepare_sequences from utils.multi_store_data_utils import get_store_product_sales_data, aggregate_multi_store_data from utils.visualization import plot_loss_curve from analysis.metrics import evaluate_model from core.config import ( DEVICE, DEFAULT_MODEL_DIR, LOOK_BACK, FORECAST_HORIZON ) from utils.training_progress import progress_manager from utils.model_manager import model_manager def train_product_model_with_transformer( model_identifier: str, training_df: pd.DataFrame, feature_list: list, training_mode: str, epochs: int = 50, sequence_length: int = LOOK_BACK, forecast_horizon: int = FORECAST_HORIZON, model_dir: str = DEFAULT_MODEL_DIR, product_id: str = None, store_id: str = None, aggregation_method: str = None, version: str = None, socketio=None, task_id: str = None, progress_callback=None, patience: int = 10, learning_rate: float = 0.001, clip_norm: float = 1.0, **kwargs ): """ 使用Transformer模型训练产品销售预测模型 (新数据管道版) """ def emit_progress(message, progress=None, metrics=None): """发送训练进度到前端""" if socketio and task_id: data = { 'task_id': task_id, 'message': message, 'timestamp': time.time() } if progress is not None: data['progress'] = progress if metrics is not None: data['metrics'] = metrics socketio.emit('training_progress', data, namespace='/training') print(f"[{time.strftime('%H:%M:%S')}] {message}", flush=True) import sys sys.stdout.flush() sys.stderr.flush() emit_progress("开始Transformer模型训练...") try: from utils.training_progress import progress_manager except ImportError: class DummyProgressManager: def set_stage(self, *args, **kwargs): pass def start_training(self, *args, **kwargs): pass def start_epoch(self, *args, **kwargs): pass def update_batch(self, *args, **kwargs): pass def finish_epoch(self, *args, **kwargs): pass def finish_training(self, *args, **kwargs): pass progress_manager = DummyProgressManager() min_required_samples = sequence_length + forecast_horizon if len(training_df) < min_required_samples: error_msg = f"训练数据不足: 需要 {min_required_samples} 条记录, 但只有 {len(training_df)} 条。" emit_progress(error_msg) raise ValueError(error_msg) product_name = training_df['product_name'].iloc[0] if 'product_name' in training_df.columns else model_identifier emit_progress(f"开始为 '{product_name}' (标识: {model_identifier}) 训练Transformer模型") # --- 新数据管道核心改造 --- emit_progress("数据预处理中...") # 1. 使用标准化的 prepare_data 函数处理数据 _, _, trainX, testX, trainY, testY, scaler_X, scaler_y = prepare_data( training_df=training_df, feature_list=feature_list, target_column='net_sales_quantity', sequence_length=sequence_length, forecast_horizon=forecast_horizon ) # 2. 使用标准化的 prepare_sequences 函数创建 DataLoader batch_size = 32 train_loader = prepare_sequences(trainX, trainY, batch_size) test_loader = prepare_sequences(testX, testY, batch_size) total_batches = len(train_loader) total_samples = len(trainX) if hasattr(progress_manager, 'total_batches_per_epoch'): progress_manager.total_batches_per_epoch = total_batches progress_manager.batch_size = batch_size progress_manager.total_samples = total_samples emit_progress("数据预处理完成，开始模型训练...") input_dim = trainX.shape[2] output_dim = forecast_horizon hidden_size = 64 num_heads = 4 dropout_rate = 0.1 num_layers = 3 model = TimeSeriesTransformer( num_features=input_dim, d_model=hidden_size, nhead=num_heads, num_encoder_layers=num_layers, dim_feedforward=hidden_size * 2, dropout=dropout_rate, output_sequence_length=output_dim, seq_length=sequence_length, batch_size=batch_size ) model = model.to(DEVICE) criterion = nn.MSELoss() optimizer = optim.Adam(model.parameters(), lr=learning_rate) scheduler = torch.optim.lr_scheduler.ReduceLROnPlateau(optimizer, 'min', patience=patience // 2, factor=0.5) train_losses = [] test_losses = [] start_time = time.time() # 版本锁定 current_version = model_manager.peek_next_version( model_type='transformer', product_id=product_id, store_id=store_id, training_mode=training_mode, aggregation_method=aggregation_method ) print(f"🔒 本次训练版本锁定为: {current_version}") checkpoint_interval = max(1, epochs // 10) best_loss = float('inf') epochs_no_improve = 0 best_model_path = None progress_manager.set_stage("model_training", 0) emit_progress(f"开始训练 - 总epoch: {epochs}, 检查点间隔: {checkpoint_interval}, 耐心值: {patience}") for epoch in range(epochs): progress_manager.start_epoch(epoch) model.train() epoch_loss = 0 for batch_idx, (X_batch, y_batch) in enumerate(train_loader): X_batch, y_batch = X_batch.to(DEVICE), y_batch.to(DEVICE) outputs = model(X_batch) loss = criterion(outputs, y_batch) optimizer.zero_grad() loss.backward() if clip_norm: torch.nn.utils.clip_grad_norm_(model.parameters(), max_norm=clip_norm) optimizer.step() epoch_loss += loss.item() if batch_idx % 5 == 0 or batch_idx == len(train_loader) - 1: current_lr = optimizer.param_groups[0]['lr'] progress_manager.update_batch(batch_idx, loss.item(), current_lr) train_loss = epoch_loss / len(train_loader) train_losses.append(train_loss) progress_manager.set_stage("validation", 0) model.eval() test_loss = 0 with torch.no_grad(): for batch_idx, (X_batch, y_batch) in enumerate(test_loader): X_batch, y_batch = X_batch.to(DEVICE), y_batch.to(DEVICE) outputs = model(X_batch) loss = criterion(outputs, y_batch) test_loss += loss.item() if batch_idx % 3 == 0 or batch_idx == len(test_loader) - 1: val_progress = (batch_idx / len(test_loader)) * 100 progress_manager.set_stage("validation", val_progress) test_loss = test_loss / len(test_loader) test_losses.append(test_loss) scheduler.step(test_loss) progress_manager.finish_epoch(train_loss, test_loss) if (epoch + 1) % 5 == 0 or epoch == epochs - 1: progress = ((epoch + 1) / epochs) * 100 current_metrics = { 'train_loss': train_loss, 'test_loss': test_loss, 'epoch': epoch + 1, 'total_epochs': epochs } emit_progress(f"Epoch {epoch+1}/{epochs}, Train Loss: {train_loss:.4f}, Test Loss: {test_loss:.4f}", progress=progress, metrics=current_metrics) if (epoch + 1) % checkpoint_interval == 0 or epoch == epochs - 1: checkpoint_data = { 'epoch': epoch + 1, 'model_state_dict': model.state_dict(), 'optimizer_state_dict': optimizer.state_dict(), 'train_loss': train_loss, 'test_loss': test_loss, 'train_losses': train_losses, 'test_losses': test_losses, 'scaler_X': scaler_X, 'scaler_y': scaler_y, 'config': { 'input_dim': input_dim, 'output_dim': output_dim, 'hidden_size': hidden_size, 'num_heads': num_heads, 'dropout': dropout_rate, 'num_layers': num_layers, 'sequence_length': sequence_length, 'forecast_horizon': forecast_horizon, 'model_type': 'transformer' }, 'training_info': { 'product_id': product_id, 'product_name': product_name, 'training_mode': training_mode, 'store_id': store_id, 'aggregation_method': aggregation_method, 'timestamp': time.time() } } if test_loss < best_loss: best_loss = test_loss # 修正: 保存最佳模型路径 best_model_path, _ = model_manager.save_model( model_data=checkpoint_data, product_id=product_id, model_type='transformer', store_id=store_id, training_mode=training_mode, aggregation_method=aggregation_method, product_name=product_name, version=f"{current_version}_best" ) emit_progress(f"💾 保存最佳模型检查点 (epoch {epoch+1}, test_loss: {test_loss:.4f})") epochs_no_improve = 0 else: epochs_no_improve += 1 if (epoch + 1) % 10 == 0: print(f"📊 Epoch {epoch+1}/{epochs}, 训练损失: {train_loss:.4f}, 测试损失: {test_loss:.4f}", flush=True) if epochs_no_improve >= patience: emit_progress(f"连续 {patience} 个epoch测试损失未改善，提前停止训练。") break training_time = time.time() - start_time progress_manager.set_stage("model_saving", 0) emit_progress("训练完成，正在保存模型...") model.eval() with torch.no_grad(): all_test_X = [] all_test_Y = [] for X_batch, y_batch in test_loader: all_test_X.append(X_batch) all_test_Y.append(y_batch) testX_tensor = torch.cat(all_test_X, dim=0) testY_tensor = torch.cat(all_test_Y, dim=0) test_pred = model(testX_tensor.to(DEVICE)).cpu().numpy() test_true = testY_tensor.cpu().numpy() test_pred_inv = scaler_y.inverse_transform(test_pred) test_true_inv = scaler_y.inverse_transform(test_true) metrics = evaluate_model(test_true_inv, test_pred_inv) metrics['training_time'] = training_time print(f"\n📊 模型评估指标:", flush=True) print(f" MSE: {metrics['mse']:.4f}", flush=True) print(f" RMSE: {metrics['rmse']:.4f}", flush=True) print(f" MAE: {metrics['mae']:.4f}", flush=True) print(f" R²: {metrics['r2']:.4f}", flush=True) print(f" MAPE: {metrics['mape']:.2f}%", flush=True) print(f" ⏱️ 训练时间: {training_time:.2f}秒", flush=True) final_model_data = { 'epoch': epochs, 'model_state_dict': model.state_dict(), 'optimizer_state_dict': optimizer.state_dict(), 'train_loss': train_losses[-1], 'test_loss': test_losses[-1], 'train_losses': train_losses, 'test_losses': test_losses, 'scaler_X': scaler_X, 'scaler_y': scaler_y, 'config': { 'input_dim': input_dim, 'output_dim': output_dim, 'hidden_size': hidden_size, 'num_heads': num_heads, 'dropout': dropout_rate, 'num_layers': num_layers, 'sequence_length': sequence_length, 'forecast_horizon': forecast_horizon, 'model_type': 'transformer' }, 'metrics': metrics, 'metrics': metrics, 'training_info': { 'product_id': product_id, 'product_name': product_name, 'training_mode': training_mode, 'store_id': store_id, 'aggregation_method': aggregation_method, 'timestamp': time.time(), 'training_completed': True } } progress_manager.set_stage("model_saving", 50) final_model_path, final_version = model_manager.save_model( model_data=final_model_data, product_id=product_id, model_type='transformer', store_id=store_id, training_mode=training_mode, aggregation_method=aggregation_method, product_name=product_name, version=current_version ) progress_manager.set_stage("model_saving", 100) emit_progress(f"模型已保存到 {final_model_path}") print(f"💾 模型已保存到 {final_model_path}", flush=True) final_metrics = { 'mse': metrics['mse'], 'rmse': metrics['rmse'], 'mae': metrics['mae'], 'r2': metrics['r2'], 'mape': metrics['mape'], 'training_time': training_time, 'final_epoch': epochs, 'version': final_version } # 准备 scope 和 identifier 以生成标准化的文件名 scope = training_mode if scope == 'product': identifier = model_identifier elif scope == 'store': identifier = store_id elif scope == 'global': identifier = aggregation_method else: identifier = product_name # 后备方案 # 绘制带有版本号的损失曲线图 loss_curve_path = plot_loss_curve( train_losses=train_losses, val_losses=test_losses, model_type='transformer', scope=scope, identifier=identifier, version=current_version, # 使用锁定的版本 model_dir=model_dir ) print(f"📈 带版本号的损失曲线已保存: {loss_curve_path}") # 更新模型数据中的损失图路径 final_model_data['loss_curve_path'] = loss_curve_path artifacts = { "versioned_model": final_model_path, "loss_curve_plot": loss_curve_path, "best_model": best_model_path, "version": final_version } return final_metrics, artifacts # --- 将此训练器注册到系统中 --- from models.model_registry import register_trainer register_trainer('transformer', train_product_model_with_transformer)