update
This commit is contained in:
412
train_dpp.py
412
train_dpp.py
@@ -1,20 +1,21 @@
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import torch
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import torch.nn as nn
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from torch.optim import Adam
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from torch.utils.data import DataLoader, DistributedSampler
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import torch.distributed as dist
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import torch.multiprocessing as mp
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from torch.nn.parallel import DistributedDataParallel as DDP
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import numpy as np
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# train.py (DDP-ready)
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import os
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import math
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import argparse
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import numpy as np
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import tqdm
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import matplotlib.pyplot as plt
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import os
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import time
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import torch
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import torch.nn as nn
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import torch.distributed as dist
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from torch.optim import Adam
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from torch.utils.data import DataLoader, DistributedSampler
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from models import TimeAwareGPT2, CombinedLoss
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from utils import PatientEventDataset
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# --- Configuration ---
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class TrainConfig:
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# Data parameters
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@@ -31,90 +32,120 @@ class TrainConfig:
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# Training parameters
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max_epoch = 200
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batch_size = 512 # 增大总批次大小
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batch_size = 128
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lr_initial = 6e-4
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lr_final = 6e-5
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warmup_epochs = 10
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early_stopping_patience = 5
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# Loss parameters
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# 0 = padding, 1 = "no event"
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ignored_token_ids = [0, 1]
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# Distributed training parameters
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world_size = torch.cuda.device_count()
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distributed = world_size > 1
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# System parameters (device 将在 main() 内按 local_rank 动态设置)
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device = 'cuda' if torch.cuda.is_available() else 'cpu'
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# --- Main Training Function ---
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def train_worker(local_rank, config):
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# Initialize distributed training
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if config.distributed:
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dist.init_process_group(
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backend='nccl',
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init_method='env://',
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rank=local_rank,
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world_size=config.world_size
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)
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def setup_distributed(backend: str = "nccl"):
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"""
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如果由 torchrun 启动且 WORLD_SIZE>1，则初始化分布式。
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返回 (is_distributed, world_size, rank, local_rank)
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"""
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world_size = int(os.environ.get("WORLD_SIZE", "1"))
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is_distributed = world_size > 1
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if is_distributed:
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if not dist.is_initialized():
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dist.init_process_group(backend=backend, init_method="env://")
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rank = dist.get_rank()
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local_rank = int(os.environ.get("LOCAL_RANK", "0"))
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torch.cuda.set_device(local_rank)
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device = torch.device('cuda', local_rank)
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print(f"Worker {local_rank} initialized on device {device}")
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else:
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device = torch.device('cuda' if torch.cuda.is_available() else 'cpu')
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rank = 0
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local_rank = 0
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return is_distributed, world_size, rank, local_rank
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def cleanup_distributed():
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if dist.is_available() and dist.is_initialized():
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dist.destroy_process_group()
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def all_reduce_mean(value: float, device, world_size: int):
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"""
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value 是 Python float（本进程的和/均值），返回所有进程平均后的 float。
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"""
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tensor = torch.tensor([value], dtype=torch.float32, device=device)
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dist.all_reduce(tensor, op=dist.ReduceOp.SUM)
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tensor /= world_size
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return float(tensor.item())
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def main():
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parser = argparse.ArgumentParser()
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parser.add_argument("--backend", type=str, default="nccl", choices=["nccl", "gloo", "mpi"])
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parser.add_argument("--seed", type=int, default=42)
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args = parser.parse_args()
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# 分布式初始化
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is_dist, world_size, rank, local_rank = setup_distributed(args.backend)
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# 基本环境
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torch.manual_seed(args.seed + rank)
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np.random.seed(args.seed + rank)
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torch.backends.cudnn.benchmark = True
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config = TrainConfig()
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device = torch.device(f"cuda:{local_rank}" if torch.cuda.is_available() else "cpu")
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config.device = device
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is_main = (rank == 0)
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# --- 1. Data Loading ---
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if local_rank == 0:
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if is_main:
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print(f"Loading data from {config.train_data_path} and {config.val_data_path}...")
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train_data_arr = np.memmap(config.train_data_path, dtype=np.uint32, mode='r').reshape(-1, 3)
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val_data_arr = np.memmap(config.val_data_path, dtype=np.uint32, mode='r').reshape(-1, 3)
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# Infer vocab_size from the data (max label + 1)
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vocab_size = int(max(train_data_arr[:, 2].max(), val_data_arr[:, 2].max())) + 1
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if local_rank == 0:
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if is_main:
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print(f"Inferred vocabulary size: {vocab_size}")
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print(f"Using {config.world_size} GPU(s) for training")
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train_dataset = PatientEventDataset(train_data_arr, config.block_length)
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val_dataset = PatientEventDataset(val_data_arr, config.block_length)
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# 计算每个GPU的批次大小
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per_gpu_batch_size = config.batch_size // config.world_size
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# 优化数据加载器参数
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if config.distributed:
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train_sampler = DistributedSampler(train_dataset, num_replicas=config.world_size, rank=local_rank, shuffle=True)
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val_sampler = DistributedSampler(val_dataset, num_replicas=config.world_size, rank=local_rank, shuffle=False)
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# 分布式采样器
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if is_dist:
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train_sampler = DistributedSampler(train_dataset, num_replicas=world_size, rank=rank, shuffle=True, drop_last=False)
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val_sampler = DistributedSampler(val_dataset, num_replicas=world_size, rank=rank, shuffle=False, drop_last=False)
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else:
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train_sampler = None
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val_sampler = None
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# 增加num_workers，使用persistent_workers减少进程创建开销
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train_loader = DataLoader(
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train_dataset,
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batch_size=per_gpu_batch_size, # 使用每个GPU的批次大小
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sampler=train_sampler,
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batch_size=config.batch_size,
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shuffle=(train_sampler is None),
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num_workers=8, # 增加worker数量
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sampler=train_sampler,
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num_workers=4,
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pin_memory=True,
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persistent_workers=True, # 保持worker进程
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prefetch_factor=2 # 预取批次
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drop_last=False,
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persistent_workers=True if 4 > 0 else False,
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)
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val_loader = DataLoader(
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val_dataset,
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batch_size=per_gpu_batch_size,
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sampler=val_sampler,
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batch_size=config.batch_size,
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shuffle=False,
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num_workers=8,
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sampler=val_sampler,
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num_workers=4,
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pin_memory=True,
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persistent_workers=True,
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prefetch_factor=2
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drop_last=False,
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persistent_workers=True if 4 > 0 else False,
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)
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# --- 2. Model, Optimizer, and Loss Initialization ---
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if local_rank == 0:
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print(f"Initializing model on {device}...")
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if is_main:
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print(f"Initializing model on {config.device}...")
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model = TimeAwareGPT2(
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vocab_size=vocab_size,
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n_embd=config.n_embd,
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@@ -124,36 +155,37 @@ def train_worker(local_rank, config):
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token_pdrop=config.token_pdrop
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).to(device)
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# 使用梯度累积来模拟更大的批次大小，减少通信频率
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if config.distributed:
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# 使用find_unused_parameters=False来加速
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model = DDP(model, device_ids=[local_rank], output_device=local_rank,
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find_unused_parameters=False)
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if local_rank == 0:
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if config.distributed:
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num_params = sum(p.numel() for p in model.module.parameters() if p.requires_grad)
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else:
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num_params = sum(p.numel() for p in model.parameters() if p.requires_grad)
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print(f"Model initialized with {num_params/1e6:.2f}M trainable parameters.")
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print(f"Per GPU batch size: {per_gpu_batch_size}")
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if is_main and hasattr(model, "get_num_params"):
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print(f"Model initialized with {model.get_num_params():.2f}M trainable parameters.")
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loss_fn = CombinedLoss(config.ignored_token_ids)
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optimizer = Adam(model.parameters(), lr=config.lr_initial)
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# DDP 包装
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if is_dist:
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model = nn.parallel.DistributedDataParallel(
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model,
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device_ids=[local_rank] if device.type == "cuda" else None,
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output_device=local_rank if device.type == "cuda" else None,
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find_unused_parameters=False,
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)
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# --- 3. Training Loop ---
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best_val_loss = float('inf')
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patience_counter = 0
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if local_rank == 0:
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train_losses_ce, train_losses_surv, train_losses_total = [], [], []
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val_losses_ce, val_losses_surv, val_losses_total = [], [], []
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# 只在主进程收集与画图
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train_losses_ce, train_losses_surv, train_losses_total = [], [], []
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val_losses_ce, val_losses_surv, val_losses_total = [], [], []
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if local_rank == 0:
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if is_main:
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print("Starting training...")
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stop_training = False
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for epoch in range(config.max_epoch):
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if config.distributed:
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# 设置 epoch 给分布式采样器，确保跨 epoch shuffle
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if is_dist:
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train_sampler.set_epoch(epoch)
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# --- Learning Rate Scheduling ---
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@@ -162,24 +194,23 @@ def train_worker(local_rank, config):
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else:
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progress = (epoch - config.warmup_epochs) / (config.max_epoch - config.warmup_epochs)
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lr = config.lr_final + 0.5 * (config.lr_initial - config.lr_final) * (1 + math.cos(math.pi * progress))
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for param_group in optimizer.param_groups:
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param_group['lr'] = lr
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# --- Training Phase ---
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if is_main:
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pbar = tqdm.tqdm(train_loader, desc=f"Epoch {epoch+1}/{config.max_epoch} [Train]")
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else:
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pbar = train_loader # 非主进程禁用 tqdm
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model.train()
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train_loss_ce_acc, train_loss_surv_acc = 0.0, 0.0
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train_steps = 0
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# 只在rank 0显示进度条
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if local_rank == 0:
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pbar = tqdm.tqdm(train_loader, desc=f"Epoch {epoch+1}/{config.max_epoch} [Train]")
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else:
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pbar = train_loader
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batch_start_time = time.time()
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for batch_idx, (event_seq, time_seq) in enumerate(pbar):
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event_seq, time_seq = event_seq.to(device, non_blocking=True), time_seq.to(device, non_blocking=True)
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for batch in pbar:
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event_seq, time_seq = batch
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event_seq = event_seq.to(device, non_blocking=True)
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time_seq = time_seq.to(device, non_blocking=True)
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# Prepare inputs and targets
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input_events = event_seq[:, :-1]
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@@ -193,52 +224,49 @@ def train_worker(local_rank, config):
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loss = loss_ce + loss_survival
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# Backward pass and optimization
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optimizer.zero_grad()
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optimizer.zero_grad(set_to_none=True)
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loss.backward()
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# 梯度同步在DDP中自动处理
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optimizer.step()
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# 异步记录损失，避免同步阻塞
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train_loss_ce_acc += loss_ce.item()
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train_loss_surv_acc += loss_survival.item()
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train_loss_ce_acc += float(loss_ce.item())
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train_loss_surv_acc += float(loss_survival.item())
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train_steps += 1
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if local_rank == 0 and batch_idx % 10 == 0: # 每10个批次更新一次
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batch_time = time.time() - batch_start_time
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pbar.set_postfix({
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'loss_ce': f'{loss_ce.item():.4f}',
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'loss_surv': f'{loss_survival.item():.4f}',
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'lr': f'{lr:.2e}',
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'batch_time': f'{batch_time:.3f}s'
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})
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batch_start_time = time.time()
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if is_main and isinstance(pbar, tqdm.tqdm):
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pbar.set_postfix({'loss_ce': f'{loss_ce.item():.4f}', 'loss_surv': f'{loss_survival.item():.4f}', 'lr': f'{lr:.2e}'})
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# 只在epoch结束时同步一次损失，减少通信
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if config.distributed:
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# 使用all_reduce同步损失
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train_loss_ce_tensor = torch.tensor([train_loss_ce_acc], device=device)
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train_loss_surv_tensor = torch.tensor([train_loss_surv_acc], device=device)
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train_steps_tensor = torch.tensor([train_steps], device=device)
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# 进程内均值
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avg_train_loss_ce_local = train_loss_ce_acc / max(train_steps, 1)
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avg_train_loss_surv_local = train_loss_surv_acc / max(train_steps, 1)
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dist.all_reduce(train_loss_ce_tensor)
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dist.all_reduce(train_loss_surv_tensor)
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dist.all_reduce(train_steps_tensor)
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avg_train_loss_ce = (train_loss_ce_tensor.item() / train_steps_tensor.item())
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avg_train_loss_surv = (train_loss_surv_tensor.item() / train_steps_tensor.item())
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# 所有进程平均
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if is_dist:
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avg_train_loss_ce = all_reduce_mean(avg_train_loss_ce_local, device, world_size)
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avg_train_loss_surv = all_reduce_mean(avg_train_loss_surv_local, device, world_size)
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else:
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avg_train_loss_ce = train_loss_ce_acc / train_steps
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avg_train_loss_surv = train_loss_surv_acc / train_steps
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avg_train_loss_ce = avg_train_loss_ce_local
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avg_train_loss_surv = avg_train_loss_surv_local
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if is_main:
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train_losses_ce.append(avg_train_loss_ce)
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train_losses_surv.append(avg_train_loss_surv)
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train_losses_total.append(avg_train_loss_ce + avg_train_loss_surv)
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# --- Validation Phase ---
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if is_main:
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pbar_val = tqdm.tqdm(val_loader, desc=f"Epoch {epoch+1}/{config.max_epoch} [Val]")
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else:
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pbar_val = val_loader
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model.eval()
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val_loss_ce_acc, val_loss_surv_acc = 0.0, 0.0
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val_steps = 0
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with torch.no_grad():
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for event_seq, time_seq in val_loader:
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event_seq, time_seq = event_seq.to(device, non_blocking=True), time_seq.to(device, non_blocking=True)
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for batch in pbar_val:
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event_seq, time_seq = batch
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event_seq = event_seq.to(device, non_blocking=True)
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time_seq = time_seq.to(device, non_blocking=True)
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input_events = event_seq[:, :-1]
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input_times = time_seq[:, :-1]
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@@ -248,103 +276,125 @@ def train_worker(local_rank, config):
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logits = model(input_events, input_times)
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loss_ce, loss_survival = loss_fn(logits, target_events, target_wait_times)
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val_loss_ce_acc += loss_ce.item()
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val_loss_surv_acc += loss_survival.item()
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val_loss_ce_acc += float(loss_ce.item())
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val_loss_surv_acc += float(loss_survival.item())
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val_steps += 1
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# 同步验证损失
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if config.distributed:
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val_loss_ce_tensor = torch.tensor([val_loss_ce_acc], device=device)
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val_loss_surv_tensor = torch.tensor([val_loss_surv_acc], device=device)
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val_steps_tensor = torch.tensor([val_steps], device=device)
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if is_main and isinstance(pbar_val, tqdm.tqdm):
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pbar_val.set_postfix({'loss_ce': f'{loss_ce.item():.4f}', 'loss_surv': f'{loss_survival.item():.4f}'})
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dist.all_reduce(val_loss_ce_tensor)
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dist.all_reduce(val_loss_surv_tensor)
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dist.all_reduce(val_steps_tensor)
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avg_val_loss_ce_local = val_loss_ce_acc / max(val_steps, 1)
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avg_val_loss_surv_local = val_loss_surv_acc / max(val_steps, 1)
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avg_val_loss_ce = (val_loss_ce_tensor.item() / val_steps_tensor.item())
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avg_val_loss_surv = (val_loss_surv_tensor.item() / val_steps_tensor.item())
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if is_dist:
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avg_val_loss_ce = all_reduce_mean(avg_val_loss_ce_local, device, world_size)
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avg_val_loss_surv = all_reduce_mean(avg_val_loss_surv_local, device, world_size)
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else:
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avg_val_loss_ce = val_loss_ce_acc / val_steps
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avg_val_loss_surv = val_loss_surv_acc / val_steps
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avg_val_loss_ce = avg_val_loss_ce_local
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avg_val_loss_surv = avg_val_loss_surv_local
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total_val_loss = avg_val_loss_ce + avg_val_loss_surv
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# 只在rank 0进行打印和保存
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if local_rank == 0:
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||||
train_losses_ce.append(avg_train_loss_ce)
|
||||
train_losses_surv.append(avg_train_loss_surv)
|
||||
train_losses_total.append(avg_train_loss_ce + avg_train_loss_surv)
|
||||
val_losses_ce.append(avg_val_loss_ce)
|
||||
val_losses_surv.append(avg_val_loss_surv)
|
||||
val_losses_total.append(total_val_loss)
|
||||
|
||||
# 主进程打印与记录
|
||||
if is_main:
|
||||
print(f"Epoch {epoch+1} Summary: \n"
|
||||
f" Train Loss: {avg_train_loss_ce + avg_train_loss_surv:.4f} (CE: {avg_train_loss_ce:.4f}, Surv: {avg_train_loss_surv:.4f})\n"
|
||||
f" Val Loss: {total_val_loss:.4f} (CE: {avg_val_loss_ce:.4f}, Surv: {avg_val_loss_surv:.4f})\n"
|
||||
f" Learning Rate: {lr:.6f}")
|
||||
val_losses_ce.append(avg_val_loss_ce)
|
||||
val_losses_surv.append(avg_val_loss_surv)
|
||||
val_losses_total.append(total_val_loss)
|
||||
|
||||
# Early stopping check
|
||||
# --- Early Stopping Check (基于聚合后的 total_val_loss) ---
|
||||
improved = False
|
||||
if is_main:
|
||||
if total_val_loss < best_val_loss:
|
||||
best_val_loss = total_val_loss
|
||||
patience_counter = 0
|
||||
improved = True
|
||||
print(f"Validation loss improved to {best_val_loss:.4f}. Saving checkpoint...")
|
||||
if config.distributed:
|
||||
torch.save(model.module.state_dict(), 'best_model_checkpoint.pt')
|
||||
else:
|
||||
torch.save(model.state_dict(), 'best_model_checkpoint.pt')
|
||||
# DDP: 保存 module.state_dict()
|
||||
state_dict = model.module.state_dict() if isinstance(model, nn.parallel.DistributedDataParallel) else model.state_dict()
|
||||
torch.save(state_dict, 'best_model_checkpoint.pt')
|
||||
else:
|
||||
if epoch >= config.warmup_epochs:
|
||||
patience_counter += 1
|
||||
print(f"Validation loss did not improve. Patience: {patience_counter}/{config.early_stopping_patience}")
|
||||
stop_training = patience_counter >= config.early_stopping_patience
|
||||
|
||||
if patience_counter >= config.early_stopping_patience:
|
||||
# 把 improved/stop 广播到所有进程，确保一致退出
|
||||
if is_dist:
|
||||
flag_tensor = torch.tensor([1 if stop_training else 0], device=device, dtype=torch.int32)
|
||||
dist.broadcast(flag_tensor, src=0)
|
||||
stop_training = bool(int(flag_tensor.item()))
|
||||
|
||||
if stop_training:
|
||||
if is_main:
|
||||
print("\nEarly stopping triggered due to no improvement in validation loss.")
|
||||
if config.distributed:
|
||||
stop_signal = torch.tensor(1, device=device)
|
||||
dist.broadcast(stop_signal, 0)
|
||||
break
|
||||
break
|
||||
|
||||
# --- Save Best Model at the End (只主进程) ---
|
||||
if is_main:
|
||||
if best_val_loss != float('inf'):
|
||||
print(f"\nTraining finished. Loading best model from checkpoint with validation loss {best_val_loss:.4f}.")
|
||||
# 为了易用，这里在主进程上重新构建单卡模型加载权重再保存
|
||||
model_single = TimeAwareGPT2(
|
||||
vocab_size=vocab_size,
|
||||
n_embd=config.n_embd,
|
||||
n_layer=config.n_layer,
|
||||
n_head=config.n_head,
|
||||
pdrop=config.pdrop,
|
||||
token_pdrop=config.token_pdrop
|
||||
).to('cpu')
|
||||
model_single.load_state_dict(torch.load('best_model_checkpoint.pt', map_location='cpu'))
|
||||
print("Saving final best model to best_model.pt")
|
||||
torch.save(model_single.state_dict(), 'best_model.pt')
|
||||
else:
|
||||
# 非rank 0进程检查停止信号
|
||||
if config.distributed:
|
||||
stop_signal = torch.tensor(0, device=device)
|
||||
dist.broadcast(stop_signal, 0)
|
||||
if stop_signal.item() == 1:
|
||||
break
|
||||
print("\nTraining finished. No best model to save as validation loss never improved.")
|
||||
|
||||
# 清理和保存
|
||||
if local_rank == 0 and best_val_loss != float('inf'):
|
||||
print(f"\nTraining finished. Loading best model from checkpoint with validation loss {best_val_loss:.4f}.")
|
||||
if config.distributed:
|
||||
model.module.load_state_dict(torch.load('best_model_checkpoint.pt'))
|
||||
torch.save(model.module.state_dict(), 'best_model.pt')
|
||||
else:
|
||||
model.load_state_dict(torch.load('best_model_checkpoint.pt'))
|
||||
torch.save(model.state_dict(), 'best_model.pt')
|
||||
print("Final best model saved to best_model.pt")
|
||||
# --- Plot and Save Loss Curves ---
|
||||
num_epochs = len(train_losses_total)
|
||||
if num_epochs > 0:
|
||||
epochs = range(1, num_epochs + 1)
|
||||
plt.figure(figsize=(18, 5))
|
||||
|
||||
if config.distributed:
|
||||
dist.destroy_process_group()
|
||||
# Plot CE Loss
|
||||
plt.subplot(1, 3, 1)
|
||||
plt.plot(epochs, train_losses_ce, label='Train CE')
|
||||
plt.plot(epochs, val_losses_ce, label='Val CE')
|
||||
plt.title('Cross-Entropy Loss')
|
||||
plt.xlabel('Epochs')
|
||||
plt.ylabel('Loss')
|
||||
plt.legend()
|
||||
plt.grid(True)
|
||||
|
||||
def main():
|
||||
config = TrainConfig()
|
||||
# Plot Survival Loss
|
||||
plt.subplot(1, 3, 2)
|
||||
plt.plot(epochs, train_losses_surv, label='Train Survival')
|
||||
plt.plot(epochs, val_losses_surv, label='Val Survival')
|
||||
plt.title('Survival Loss')
|
||||
plt.xlabel('Epochs')
|
||||
plt.ylabel('Loss')
|
||||
plt.legend()
|
||||
plt.grid(True)
|
||||
|
||||
# 设置环境变量优化
|
||||
os.environ['CUDA_LAUNCH_BLOCKING'] = '0' # 减少同步
|
||||
os.environ['NCCL_DEBUG'] = 'WARN' # 减少NCCL日志
|
||||
os.environ['NCCL_SOCKET_IFNAME'] = '^lo,docker' # 选择正确的网络接口
|
||||
# Plot Total Loss
|
||||
plt.subplot(1, 3, 3)
|
||||
plt.plot(epochs, train_losses_total, label='Train Total')
|
||||
plt.plot(epochs, val_losses_total, label='Val Total')
|
||||
plt.title('Total Loss')
|
||||
plt.xlabel('Epochs')
|
||||
plt.ylabel('Loss')
|
||||
plt.legend()
|
||||
plt.grid(True)
|
||||
|
||||
plt.tight_layout()
|
||||
plt.savefig('loss_curves.png')
|
||||
print("\nLoss curves saved to loss_curves.png")
|
||||
|
||||
# 清理分布式
|
||||
cleanup_distributed()
|
||||
|
||||
if config.distributed:
|
||||
print(f"Starting distributed training with {config.world_size} GPUs")
|
||||
mp.spawn(
|
||||
train_worker,
|
||||
args=(config,),
|
||||
nprocs=config.world_size,
|
||||
join=True
|
||||
)
|
||||
else:
|
||||
print("Starting single GPU training")
|
||||
train_worker(0, config)
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Reference in New Issue
Block a user