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Diffstat (limited to 'train_debiasing.py')
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diff --git a/train_debiasing.py b/train_debiasing.py new file mode 100644 index 0000000..8bbb8b0 --- /dev/null +++ b/train_debiasing.py @@ -0,0 +1,273 @@ +#!/usr/bin/env python3 +""" +纯偏见减少训练脚本 +目标：只最小化男女间熵差，不进行整体熵最小化 +""" +import argparse +import os +import torch +import torch.nn.functional as F +from torch.optim import AdamW +import pandas as pd +import numpy as np +from pathlib import Path + +import wandb +from accelerate import Accelerator, DeepSpeedPlugin +from accelerate.utils import set_seed +from transformers import AutoConfig, AutoTokenizer, AutoModelForCausalLM + +# 导入自定义模块 +import sys +sys.path.append('.') +from dataset.gee_processor import GEEProcessor +from losses.debiasing_loss import DebiasingLoss, gender_to_label +from smart_balanced_dataloader import create_smart_balanced_dataloader + +os.environ.setdefault("NCCL_TIMEOUT", "2700") +os.environ.setdefault("TORCH_NCCL_HEARTBEAT_TIMEOUT_SEC", "2700") + +def parse_args(): + parser = argparse.ArgumentParser() + # Debiasing相关参数 + parser.add_argument('--scale_factor', type=float, default=1.0, help='Debiasing loss scale factor') + parser.add_argument('--use_l1', action='store_true', help='Use L1 loss instead of L2') + parser.add_argument('--target_gap', type=float, default=0.01, help='Target entropy gap for early stopping') + + # 模型参数 + parser.add_argument('--model_name', type=str, default='Qwen2.5-Math-1.5B-Instruct', help='Model name') + parser.add_argument('--model_path', type=str, required=True, help='Model path') + parser.add_argument('--effective_batch', type=int, default=4, help='Global batch size') + parser.add_argument('--micro_batch_size', type=int, default=2, help='Micro batch size (must >=2 for balance)') + parser.add_argument('--learning_rate', type=float, default=1e-5, help='Learning rate (lower for debiasing)') + parser.add_argument('--max_steps', type=int, default=20, help='Maximum training steps') + parser.add_argument('--sample_temp', type=float, default=0.7, help='Generation temperature') + + # 运行参数 + parser.add_argument('--run_name', type=str, default='pure_debiasing', help='Run name') + parser.add_argument('--wandb_project', type=str, default='debiasing-only', help='W&B project name') + parser.add_argument('--use_test_data', action='store_true', help='Use synthetic test data') + parser.add_argument('--seed', type=int, default=42, help='Random seed') + parser.add_argument('--log_steps', type=int, default=1, help='Logging frequency') + parser.add_argument('--save_steps', type=int, default=10, help='Save frequency') + + return parser.parse_args() + +def main(): + args = parse_args() + set_seed(args.seed) + + # 强制检查batch_size + if args.micro_batch_size < 2: + print("❌ 错误: micro_batch_size必须>=2才能保证性别平衡！") + print("请使用: --micro_batch_size 2 或更大") + return + + # DeepSpeed配置 + ds_config = { + "train_micro_batch_size_per_gpu": args.micro_batch_size, + "train_batch_size": args.effective_batch, + "gradient_accumulation_steps": max(1, args.effective_batch // args.micro_batch_size), + "bf16": {"enabled": True}, + "zero_optimization": { + "stage": 2, + "offload_optimizer": {"device": "cpu"}, + "offload_param": {"device": "none"} + }, + "gradient_clipping": 1.0, + } + + accelerator = Accelerator( + mixed_precision="bf16", + gradient_accumulation_steps=max(1, args.effective_batch // args.micro_batch_size), + deepspeed_plugin=DeepSpeedPlugin(hf_ds_config=ds_config) + ) + + print = accelerator.print + print(f"🎯 开始纯偏见减少训练 - {args.run_name}") + print(f"📊 配置信息:") + print(f" 批次大小: micro={args.micro_batch_size}, effective={args.effective_batch}") + print(f" 缩放因子: {args.scale_factor}") + print(f" 目标熵差: {args.target_gap}") + print(f" 学习率: {args.learning_rate}") + print(f" ⚠️ 注意: 只进行偏见减少，不进行熵最小化") + + # 加载模型 + model_path = args.model_path + config = AutoConfig.from_pretrained(model_path, trust_remote_code=True) + config.use_cache = False + model = AutoModelForCausalLM.from_pretrained(model_path, config=config, trust_remote_code=True) + model.gradient_checkpointing_enable() + + tokenizer = AutoTokenizer.from_pretrained(model_path, trust_remote_code=True) + if tokenizer.pad_token is None: + tokenizer.pad_token = tokenizer.eos_token + + # 初始化纯偏见减少损失函数 + gee_processor = GEEProcessor(tokenizer) + debiasing_loss_fn = DebiasingLoss(use_l1=args.use_l1, scale_factor=args.scale_factor) + + if accelerator.is_main_process: + wandb.init(project=args.wandb_project, name=args.run_name, config=vars(args)) + + # 准备数据 + if args.use_test_data: + print("📊 使用合成测试数据...") + train_data = gee_processor.create_test_data(num_samples=100) + + # 检查数据平衡性 + male_count = sum(1 for item in train_data if item['gender'] == 'male') + female_count = sum(1 for item in train_data if item['gender'] == 'female') + print(f"原始数据: male={male_count}, female={female_count}") + + # 创建智能平衡的数据加载器 + train_loader = create_smart_balanced_dataloader( + train_data, + batch_size=args.micro_batch_size, + num_batches=args.max_steps + 5 + ) + else: + print("❌ 请使用 --use_test_data 进行测试") + return + + optimizer = AdamW(model.parameters(), lr=args.learning_rate) + model, optimizer = accelerator.prepare(model, optimizer) + + print(f"🎯 开始训练...") + print(f" 目标: 最小化 |H_female - H_male|") + print(f" 理想结果: entropy_gap → {args.target_gap}") + + # 开始训练 + model.train() + best_gap = float('inf') + converged_steps = 0 + + for step, batch in enumerate(train_loader, start=1): + if step > args.max_steps: + print(f"🛑 达到最大步数 {args.max_steps}，训练结束") + break + + with accelerator.accumulate(model): + try: + # 验证批次平衡性 + male_count = sum(1 for g in batch["gender"] if g == 'male') + female_count = sum(1 for g in batch["gender"] if g == 'female') + + if male_count == 0 or female_count == 0: + print(f"💥 Step {step}: 批次不平衡！male={male_count}, female={female_count}") + continue + + # 准备输入 + inputs = tokenizer( + batch["input"], + return_tensors="pt", + padding="longest", + truncation=True, + max_length=1024 + ).to(accelerator.device) + + # 生成回答 + with torch.no_grad(): + gen_ids = accelerator.unwrap_model(model).generate( + **inputs, + max_new_tokens=128, + do_sample=True, + top_p=0.95, + temperature=args.sample_temp, + synced_gpus=True, + repetition_penalty=1.15, + pad_token_id=tokenizer.pad_token_id, + use_cache=False + ) + + # 准备完整序列 + seq = torch.cat([inputs.input_ids, gen_ids[:, inputs.input_ids.shape[1]:]], dim=1) + pad_mask = seq.ne(tokenizer.pad_token_id) + prompt_lengths = pad_mask[:, :inputs.input_ids.shape[1]].sum(-1) + + # 计算logits和熵 + logits = model(seq, attention_mask=pad_mask).logits + H_tok = debiasing_loss_fn.compute_token_entropy(logits, pad_mask) + H_i = debiasing_loss_fn.compute_sample_entropy(H_tok, prompt_lengths) + + # 准备性别标签 + gender_labels = torch.tensor([ + gender_to_label(g) for g in batch["gender"] + ], device=accelerator.device) + + # 计算纯偏见减少损失 + loss, metrics = debiasing_loss_fn.compute_debiasing_loss(H_i, gender_labels) + + # 反向传播 + accelerator.backward(loss) + accelerator.clip_grad_norm_(model.parameters(), 1.0) + optimizer.step() + optimizer.zero_grad() + + # 检查收敛 + current_gap = metrics['entropy_gap'] + if current_gap < best_gap: + best_gap = current_gap + converged_steps = 0 + else: + converged_steps += 1 + + # 早停检查 + if current_gap <= args.target_gap: + print(f"🎉 达到目标熵差 {args.target_gap}！当前: {current_gap:.6f}") + print(f"在第 {step} 步实现目标") + break + + # 日志记录 + if accelerator.is_main_process: + if step % args.log_steps == 0: + gap_direction = "📉" if current_gap <= best_gap else "📈" + print(f"{gap_direction} Step {step} | loss={loss.item():.6f} | " + f"gap={current_gap:.6f} | " + f"H_male={metrics['H_male']:.6f} | " + f"H_female={metrics['H_female']:.6f} | " + f"批次[{male_count}M,{female_count}F]") + + # 添加进度指标 + progress = max(0, min(1, (0.1 - current_gap) / 0.1)) * 100 # 假设从0.1开始 + metrics['progress_percent'] = progress + metrics['best_gap'] = best_gap + + wandb.log({"step": step, **metrics}) + + # 保存检查点 + if accelerator.is_main_process and step % args.save_steps == 0: + ckpt = Path(f"checkpoints/{args.model_name}/{args.run_name}") / f"step_{step}" + ckpt.mkdir(parents=True, exist_ok=True) + accelerator.unwrap_model(model).save_pretrained(ckpt, safe_serialization=True) + tokenizer.save_pretrained(ckpt) + print(f"💾 检查点已保存: {ckpt}") + + except Exception as e: + print(f"❌ 训练步骤 {step} 出错: {e}") + continue + + if accelerator.is_main_process: + print(f"\n🎉 纯偏见减少训练完成!") + print(f"📊 最终结果:") + print(f" 最佳熵差: {best_gap:.6f}") + print(f" 目标熵差: {args.target_gap}") + + if best_gap <= args.target_gap: + print("✅ 成功达到偏见减少目标！") + elif best_gap <= 0.05: + print("⚠️ 偏见显著减少，接近目标") + else: + print("❌ 偏见减少效果有限，可能需要更多训练步数或调整参数") + + # 保存最终模型 + final = Path(f"checkpoints/{args.model_name}/{args.run_name}") / "final" + final.mkdir(parents=True, exist_ok=True) + accelerator.unwrap_model(model).save_pretrained(final, safe_serialization=True) + tokenizer.save_pretrained(final) + print(f"💾 最终模型已保存: {final}") + + wandb.finish() + +if __name__ == "__main__": + main()
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