372 lines
13 KiB
Python
372 lines
13 KiB
Python
"""
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CosFace超参数网格搜索脚本
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用法: python train/grid_search_cosface.py --task dish
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"""
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import os
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import sys
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import time
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import json
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import logging
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import itertools
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from datetime import datetime
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from typing import List, Dict, Tuple
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import torch
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import torch.nn as nn
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import torch.optim as optim
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from torch.utils.data import DataLoader
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from torchvision import datasets, transforms
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from tqdm import tqdm
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import pandas as pd
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import seaborn as sns
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import matplotlib.pyplot as plt
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# 导入训练脚本中的组件
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sys.path.append(os.path.join(os.path.dirname(__file__), '..'))
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from train.train_cosface_embedding import (
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TASKS, build_transforms, CosFaceHead, run_epoch, device
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)
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from net.resnet_embedding import create_resnet50_embedding
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from settings import settings
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# 日志配置
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logging.basicConfig(
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level=logging.INFO,
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format='%(asctime)s - %(levelname)s - %(message)s',
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handlers=[
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logging.FileHandler('grid_search.log', encoding='utf-8'),
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logging.StreamHandler()
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]
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)
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logger = logging.getLogger(__name__)
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# ==================== 网格搜索空间定义 ====================
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GRID_PARAMS = {
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'dish': {
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's': [56.0, 60.0, 64.0, 68.0], # scale参数
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'm': [0.32, 0.35, 0.38, 0.40], # margin参数
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},
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'whole_ingredient': {
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's': [56.0, 60.0, 64.0, 68.0],
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'm': [0.32, 0.35, 0.38, 0.40],
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},
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'processed_ingredient': {
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's': [56.0, 60.0, 64.0, 68.0],
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'm': [0.30, 0.33, 0.36, 0.39],
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},
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}
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def evaluate_on_test(model: nn.Module, head: nn.Module, test_loader: DataLoader) -> Tuple[float, float]:
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"""在测试集上评估模型"""
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model.eval()
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head.eval()
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criterion = nn.CrossEntropyLoss()
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total_loss = 0.0
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total_samples = 0
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correct_samples = 0
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with torch.no_grad():
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for images, labels in tqdm(test_loader, desc='测试集评估', leave=False):
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images = images.to(device)
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labels = labels.to(device)
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feats = model(images)
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logits = head(feats) # 测试时不加margin
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loss = criterion(logits, labels)
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pred = logits.argmax(dim=1)
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correct = (pred == labels).sum().item()
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total_loss += loss.item() * labels.size(0)
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total_samples += labels.size(0)
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correct_samples += correct
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avg_loss = total_loss / max(total_samples, 1)
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avg_acc = 100.0 * correct_samples / max(total_samples, 1)
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return avg_acc, avg_loss
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def train_single_config(
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cfg,
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s: float,
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m: float,
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train_loader: DataLoader,
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val_loader: DataLoader,
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test_loader: DataLoader,
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num_classes: int,
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max_epochs: int = 100,
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patience: int = 10,
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min_epochs: int = 25,
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min_delta: float = 0.001
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) -> Tuple[nn.Module, nn.Module, Dict]:
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"""训练单个超参数配置"""
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logger.info(f'开始训练配置: s={s}, m={m}')
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# 创建模型
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model = create_resnet50_embedding(
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embedding_dim=cfg.embedding_dim,
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pretrained=True,
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use_internal_preprocess=False
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).to(device)
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head = CosFaceHead(
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in_features=cfg.embedding_dim,
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num_classes=num_classes,
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s=s,
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m=m
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).to(device)
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# 优化器和学习率调度
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criterion = nn.CrossEntropyLoss()
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optimizer = optim.AdamW(
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list(model.parameters()) + list(head.parameters()),
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lr=cfg.lr,
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weight_decay=1e-4
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)
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scheduler = optim.lr_scheduler.CosineAnnealingLR(optimizer, T_max=max_epochs)
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# 早停变量
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best_val_loss = float('inf')
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early_stop_counter = 0
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best_epoch = 0
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# 训练历史
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train_losses = []
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val_losses = []
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train_accs = []
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val_accs = []
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start_time = time.time()
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# 训练循环
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for epoch in range(max_epochs):
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# 训练一个epoch
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tr_loss, tr_acc = run_epoch(model, head, train_loader, criterion, optimizer, train=True)
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va_loss, va_acc = run_epoch(model, head, val_loader, criterion, optimizer=None, train=False)
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scheduler.step()
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train_losses.append(tr_loss)
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val_losses.append(va_loss)
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train_accs.append(tr_acc)
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val_accs.append(va_acc)
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logger.info(f'Epoch {epoch+1}/{max_epochs} | Train Loss: {tr_loss:.4f}, Acc: {tr_acc:.2f}% | Val Loss: {va_loss:.4f}, Acc: {va_acc:.2f}%')
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# 早停逻辑
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if va_loss < best_val_loss - min_delta:
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best_val_loss = va_loss
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early_stop_counter = 0
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best_epoch = epoch
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else:
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early_stop_counter += 1
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# 早停判断
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if epoch >= min_epochs and early_stop_counter >= patience:
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logger.info(f'早停触发于Epoch {epoch+1}, 最佳Epoch: {best_epoch+1}')
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break
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elapsed_time = time.time() - start_time
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actual_epochs = len(train_losses)
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# 测试集评估
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test_acc, test_loss = evaluate_on_test(model, head, test_loader)
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logger.info(f'✓ 训练完成 | 耗时: {elapsed_time/60:.1f}分钟 | 实际Epoch: {actual_epochs} | Val Acc={val_accs[-1]:.2f}% | Test Acc={test_acc:.2f}%')
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train_info = {
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's': s,
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'm': m,
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'actual_epochs': actual_epochs,
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'early_stopped': actual_epochs < max_epochs,
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'training_time_minutes': elapsed_time / 60,
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'best_val_loss': best_val_loss,
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'final_train_loss': train_losses[-1],
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'final_val_loss': val_losses[-1],
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'final_train_acc': train_accs[-1],
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'final_val_acc': val_accs[-1],
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'test_acc': test_acc,
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'test_loss': test_loss,
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}
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return model, head, train_info
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def save_results_csv(results: List[Dict], save_path: str):
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"""保存结果到CSV"""
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df = pd.DataFrame(results)
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df = df.sort_values('test_acc', ascending=False)
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df.to_csv(save_path, index=False, encoding='utf-8-sig')
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logger.info(f'✓ 结果CSV已保存: {save_path}')
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# 打印前5名
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logger.info('\n' + '='*60)
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logger.info('测试集准确率TOP5配置:')
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logger.info('='*60)
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top5 = df.head(5)
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for idx, row in top5.iterrows():
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logger.info(f'Rank {idx+1}: s={row["s"]}, m={row["m"]} | Test Acc={row["test_acc"]:.2f}% | '
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f'Val Acc={row["final_val_acc"]:.2f}% | Epochs={int(row["actual_epochs"])}')
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logger.info('='*60 + '\n')
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def visualize_heatmap(results: List[Dict], save_path: str):
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"""生成参数热力图"""
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df = pd.DataFrame(results)
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# 创建透视表
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pivot = df.pivot_table(values='test_acc', index='m', columns='s', aggfunc='mean')
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plt.figure(figsize=(10, 8))
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sns.heatmap(pivot, annot=True, fmt='.2f', cmap='YlGnBu', cbar_kws={'label': 'Test Accuracy (%)'})
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plt.title('CosFace超参数网格搜索热力图 (测试集准确率)', fontsize=14, fontweight='bold')
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plt.xlabel('Scale (s)', fontsize=12)
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plt.ylabel('Margin (m)', fontsize=12)
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plt.tight_layout()
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plt.savefig(save_path, dpi=300, bbox_inches='tight')
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plt.close()
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logger.info(f'✓ 热力图已保存: {save_path}')
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def grid_search_main(
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task_key: str = 'dish',
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max_configs: int = None,
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max_epochs: int = 100,
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patience: int = 10,
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min_epochs: int = 25
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):
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"""网格搜索主函数"""
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logger.info('='*80)
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logger.info(f'开始CosFace超参数网格搜索 - 任务: {task_key}')
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logger.info('='*80)
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cfg = TASKS[task_key]
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params = GRID_PARAMS[task_key]
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# 生成所有参数组合
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param_combinations = list(itertools.product(params['s'], params['m']))
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total_configs = len(param_combinations)
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if max_configs is not None and max_configs < total_configs:
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param_combinations = param_combinations[:max_configs]
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logger.info(f'⚠ 限制最大配置数为 {max_configs}')
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logger.info(f'任务配置: {cfg.name}')
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logger.info(f'搜索空间: s={params["s"]}, m={params["m"]}')
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logger.info(f'总配置数: {len(param_combinations)}')
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logger.info(f'早停参数: patience={patience}, min_epochs={min_epochs}')
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logger.info(f'评估指标: 测试集准确率 (test_acc)')
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logger.info('='*80 + '\n')
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# 创建保存目录
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timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
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save_dir = os.path.join(settings.BASE_DIR, 'model', cfg.name, f'grid_search_{timestamp}')
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os.makedirs(save_dir, exist_ok=True)
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# 准备数据
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transform_train, transform_val = build_transforms(cfg.aug_strength)
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train_ds = datasets.ImageFolder(cfg.train_dir, transform=transform_train)
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val_ds = datasets.ImageFolder(cfg.val_dir, transform=transform_val)
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test_ds = datasets.ImageFolder(cfg.test_dir, transform=transform_val)
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train_loader = DataLoader(train_ds, batch_size=cfg.batch_size, shuffle=True, num_workers=0, drop_last=True)
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val_loader = DataLoader(val_ds, batch_size=cfg.batch_size, shuffle=False, num_workers=0)
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test_loader = DataLoader(test_ds, batch_size=cfg.batch_size, shuffle=False, num_workers=0)
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num_classes = len(train_ds.classes)
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logger.info(f'数据集: 训练={len(train_ds)}, 验证={len(val_ds)}, 测试={len(test_ds)}, 类别数={num_classes}\n')
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# 网格搜索
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results = []
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total_start = time.time()
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for i, (s, m) in enumerate(param_combinations, 1):
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logger.info(f'\n[配置 {i}/{len(param_combinations)}] s={s}, m={m}')
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logger.info('-'*80)
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try:
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model, head, train_info = train_single_config(
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cfg, s, m,
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train_loader, val_loader, test_loader,
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num_classes,
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max_epochs=max_epochs,
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patience=patience,
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min_epochs=min_epochs
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)
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results.append(train_info)
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# 保存模型
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model_path = os.path.join(save_dir, f'model_s{s}_m{m}.pth')
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torch.save({
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'backbone_state_dict': model.state_dict(),
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'head_state_dict': head.state_dict(),
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's': s,
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'm': m,
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'test_acc': train_info['test_acc'],
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'class_names': train_ds.classes,
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}, model_path)
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except Exception as e:
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logger.error(f'配置 s={s}, m={m} 训练失败: {str(e)}')
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continue
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total_elapsed = time.time() - total_start
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# 保存结果
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csv_path = os.path.join(save_dir, 'grid_search_results.csv')
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save_results_csv(results, csv_path)
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heatmap_path = os.path.join(save_dir, 'heatmap.png')
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visualize_heatmap(results, heatmap_path)
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# 找到最佳配置
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best_result = max(results, key=lambda x: x['test_acc'])
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# 保存总结报告
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summary_path = os.path.join(save_dir, 'summary.txt')
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with open(summary_path, 'w', encoding='utf-8') as f:
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f.write('='*80 + '\n')
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f.write(f'CosFace超参数网格搜索总结 - {cfg.name}\n')
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f.write('='*80 + '\n\n')
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f.write(f'总耗时: {total_elapsed/3600:.2f} 小时\n')
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f.write(f'搜索配置数: {len(results)}/{len(param_combinations)}\n')
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f.write(f'评估指标: 测试集准确率\n\n')
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f.write('最佳配置:\n')
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f.write(f' s (scale) = {best_result["s"]}\n')
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f.write(f' m (margin) = {best_result["m"]}\n')
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f.write(f' 测试集准确率 = {best_result["test_acc"]:.2f}%\n')
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f.write(f' 验证集准确率 = {best_result["final_val_acc"]:.2f}%\n')
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f.write(f' 训练轮数 = {best_result["actual_epochs"]}\n')
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f.write(f' 训练时间 = {best_result["training_time_minutes"]:.1f} 分钟\n\n')
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f.write('使用建议:\n')
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f.write(f'在 train/train_cosface_embedding.py 的 TASKS["{task_key}"] 中更新:\n')
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f.write(f' cosface_s={best_result["s"]}\n')
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f.write(f' cosface_m={best_result["m"]}\n')
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logger.info(f'\n✓ 网格搜索完成! 总耗时: {total_elapsed/3600:.2f} 小时')
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logger.info(f'✓ 最佳配置: s={best_result["s"]}, m={best_result["m"]}, Test Acc={best_result["test_acc"]:.2f}%')
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logger.info(f'✓ 结果已保存到: {save_dir}')
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if __name__ == '__main__':
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import argparse
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parser = argparse.ArgumentParser(description='CosFace超参数网格搜索')
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parser.add_argument('--task', choices=list(TASKS.keys()), default='dish', help='任务名称')
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# parser.add_argument('--task', choices=list(TASKS.keys()), default='whole_ingredient', help='任务名称')
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parser.add_argument('--max_configs', type=int, default=None, help='最大配置数（用于测试）')
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parser.add_argument('--epochs', type=int, default=100, help='每个配置的最大训练轮数')
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parser.add_argument('--patience', type=int, default=10, help='早停容忍轮数')
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parser.add_argument('--min_epochs', type=int, default=25, help='最小训练轮数')
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args = parser.parse_args()
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grid_search_main(
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task_key=args.task,
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max_configs=args.max_configs,
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max_epochs=args.epochs,
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patience=args.patience,
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min_epochs=args.min_epochs
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)
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