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203 lines
8.0 KiB
203 lines
8.0 KiB
import argparse
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import torch
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import torch.distributed as dist
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from coati.dataset import HhRlhfDataset, RmStaticDataset
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from coati.models import LogExpLoss, LogSigLoss
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from coati.models.bloom import BLOOMRM
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from coati.models.gpt import GPTRM
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from coati.models.llama import LlamaRM
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from coati.models.opt import OPTRM
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from coati.trainer import RewardModelTrainer
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from coati.trainer.strategies import DDPStrategy, GeminiStrategy, LowLevelZeroStrategy
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from datasets import load_dataset
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from torch.optim import Adam
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from torch.optim.lr_scheduler import CosineAnnealingLR
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from torch.utils.data import DataLoader
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from torch.utils.data.distributed import DistributedSampler
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from transformers import AutoTokenizer, BloomTokenizerFast, LlamaTokenizer
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from transformers.models.gpt2.tokenization_gpt2 import GPT2Tokenizer
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from colossalai.nn.optimizer import HybridAdam
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def train(args):
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# configure strategy
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if args.strategy == "ddp":
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strategy = DDPStrategy()
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elif args.strategy == "colossalai_gemini":
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strategy = GeminiStrategy(placement_policy="auto")
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elif args.strategy == "colossalai_zero2":
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strategy = LowLevelZeroStrategy(stage=2, placement_policy="cuda")
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else:
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raise ValueError(f'Unsupported strategy "{args.strategy}"')
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# configure model
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with strategy.model_init_context():
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if args.model == "bloom":
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model = BLOOMRM(pretrained=args.pretrain, lora_rank=args.lora_rank)
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elif args.model == "opt":
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model = OPTRM(pretrained=args.pretrain, lora_rank=args.lora_rank)
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elif args.model == "gpt2":
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model = GPTRM(pretrained=args.pretrain, lora_rank=args.lora_rank)
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elif args.model == "llama":
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model = LlamaRM(pretrained=args.pretrain, lora_rank=args.lora_rank)
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else:
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raise ValueError(f'Unsupported model "{args.model}"')
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model.to(torch.bfloat16).to(torch.cuda.current_device())
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if args.model_path is not None:
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state_dict = torch.load(args.model_path)
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model.load_state_dict(state_dict)
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# configure tokenizer
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if args.model == "gpt2":
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tokenizer = GPT2Tokenizer.from_pretrained("gpt2" if args.tokenizer is None else args.tokenizer)
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tokenizer.pad_token = tokenizer.eos_token
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elif args.model == "bloom":
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tokenizer = BloomTokenizerFast.from_pretrained(
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"bigscience/bloom-560m" if args.tokenizer is None else args.tokenizer
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)
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tokenizer.pad_token = tokenizer.eos_token
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elif args.model == "opt":
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tokenizer = AutoTokenizer.from_pretrained("facebook/opt-350m" if args.tokenizer is None else args.tokenizer)
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tokenizer.pad_token = tokenizer.eos_token
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elif args.model == "llama":
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tokenizer = LlamaTokenizer.from_pretrained(
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"hf-internal-testing/llama-tokenizer" if args.tokenizer is None else args.tokenizer
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)
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tokenizer.eos_token = "<\s>"
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tokenizer.pad_token = tokenizer.unk_token
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else:
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raise ValueError(f'Unsupported model "{args.model}"')
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# configure optimizer
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if args.strategy.startswith("colossalai"):
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optim = HybridAdam(model.parameters(), lr=args.lr)
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else:
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optim = Adam(model.parameters(), lr=args.lr)
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# configure loss function
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if args.loss_fn == "log_sig":
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loss_fn = LogSigLoss()
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elif args.loss_fn == "log_exp":
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loss_fn = LogExpLoss()
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else:
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raise ValueError(f'Unsupported loss function "{args.loss_fn}"')
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# prepare for data and dataset
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if args.subset is not None:
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data = load_dataset(args.dataset, data_dir=args.subset)
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else:
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data = load_dataset(args.dataset)
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train_data = data["train"].select(range(min(args.max_datasets_size, len(data["train"]))))
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eval_data = data["test"].select(range(min(args.max_datasets_size, len(data["test"]))))
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if args.dataset == "Dahoas/rm-static":
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train_dataset = RmStaticDataset(train_data, tokenizer, args.max_len)
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eval_dataset = RmStaticDataset(eval_data, tokenizer, args.max_len)
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elif args.dataset == "Anthropic/hh-rlhf":
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train_dataset = HhRlhfDataset(train_data, tokenizer, args.max_len)
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eval_dataset = HhRlhfDataset(eval_data, tokenizer, args.max_len)
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else:
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raise ValueError(f'Unsupported dataset "{args.dataset}"')
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if dist.is_initialized() and dist.get_world_size() > 1:
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train_sampler = DistributedSampler(
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train_dataset,
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shuffle=True,
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seed=42,
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drop_last=True,
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rank=dist.get_rank(),
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num_replicas=dist.get_world_size(),
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)
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eval_sampler = DistributedSampler(
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eval_dataset,
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shuffle=True,
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seed=42,
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drop_last=True,
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rank=dist.get_rank(),
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num_replicas=dist.get_world_size(),
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)
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else:
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train_sampler = None
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eval_sampler = None
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train_dataloader = DataLoader(
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train_dataset,
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shuffle=(train_sampler is None),
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sampler=train_sampler,
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batch_size=args.batch_size,
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pin_memory=True,
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)
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eval_dataloader = DataLoader(
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eval_dataset, shuffle=(eval_sampler is None), sampler=eval_sampler, batch_size=args.batch_size, pin_memory=True
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)
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lr_scheduler = CosineAnnealingLR(optim, train_dataloader.__len__() // 100)
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strategy_dict = strategy.prepare(dict(model=model, optimizer=optim, lr_scheduler=lr_scheduler))
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model = strategy_dict["model"]
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optim = strategy_dict["optimizer"]
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lr_scheduler = strategy_dict["lr_scheduler"]
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trainer = RewardModelTrainer(
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model=model,
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strategy=strategy,
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optim=optim,
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lr_scheduler=lr_scheduler,
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loss_fn=loss_fn,
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max_epochs=args.max_epochs,
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)
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trainer.fit(
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train_dataloader=train_dataloader,
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eval_dataloader=eval_dataloader,
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log_dir=args.log_dir,
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use_wandb=args.use_wandb,
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)
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if args.lora_rank > 0 and args.merge_lora_weights:
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from coati.models.lora import LORA_MANAGER
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# NOTE: set model to eval to merge LoRA weights
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LORA_MANAGER.merge_weights = True
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model.eval()
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# save model checkpoint after fitting on only rank0
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strategy.save_model(model, args.save_path, only_rank0=True)
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# save optimizer checkpoint on all ranks
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if args.need_optim_ckpt:
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strategy.save_optimizer(
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trainer.optimizer, "rm_optim_checkpoint_%d.pt" % (torch.cuda.current_device()), only_rank0=False
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)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument(
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"--strategy", choices=["ddp", "colossalai_gemini", "colossalai_zero2"], default="colossalai_zero2"
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)
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parser.add_argument("--model", choices=["gpt2", "bloom", "opt", "llama"], default="bloom")
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parser.add_argument("--tokenizer", type=str, default=None)
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parser.add_argument("--pretrain", type=str, default=None)
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parser.add_argument("--model_path", type=str, default=None)
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parser.add_argument("--need_optim_ckpt", type=bool, default=False)
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parser.add_argument(
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"--dataset", type=str, choices=["Anthropic/hh-rlhf", "Dahoas/rm-static"], default="Dahoas/rm-static"
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)
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parser.add_argument("--subset", type=lambda x: None if x == "None" else x, default=None)
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parser.add_argument("--max_datasets_size", type=int, default=1000000)
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parser.add_argument("--save_path", type=str, default="rm_ckpt")
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parser.add_argument("--max_epochs", type=int, default=1)
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parser.add_argument("--batch_size", type=int, default=1)
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parser.add_argument("--max_len", type=int, default=512)
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parser.add_argument("--lora_rank", type=int, default=0, help="low-rank adaptation matrices rank")
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parser.add_argument("--merge_lora_weights", type=bool, default=True)
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parser.add_argument("--lr", type=float, default=9e-6)
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parser.add_argument("--loss_fn", type=str, default="log_sig", choices=["log_sig", "log_exp"])
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parser.add_argument("--log_dir", default="logs", type=str)
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parser.add_argument("--use_wandb", default=False, action="store_true")
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args = parser.parse_args()
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train(args)
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