283 lines
9.8 KiB
Python
283 lines
9.8 KiB
Python
import threading
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from dataclasses import dataclass, field
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from pathlib import Path
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from typing import Any, Dict, Optional, Self
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import torch
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import torch.nn as nn
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from torch.utils.data import DataLoader, random_split
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from astrai.config.train_config import TrainConfig
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from astrai.dataset import RDSampler
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from astrai.inference.core.scheduler import InferenceScheduler
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from astrai.model.components.lora import inject_lora
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from astrai.parallel.executor import BaseExecutor, ExecutorFactory
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from astrai.parallel.setup import get_current_device, get_rank, get_world_size
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from astrai.protocols import OptimizerProtocol, SchedulerProtocol
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from astrai.serialization import Checkpoint, load_json
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from astrai.tokenize import AutoTokenizer
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from astrai.trainer.rollout import RolloutGenerator, RolloutRunner
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from astrai.trainer.strategy import BaseStrategy, StrategyFactory, create_ref_model
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@dataclass
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class TrainContext:
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model: nn.Module = field(default=None)
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strategy: BaseStrategy = field(default=None)
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dataloader: DataLoader = field(default=None)
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optimizer: OptimizerProtocol = field(default=None)
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scheduler: SchedulerProtocol = field(default=None)
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checkpoint: Checkpoint = field(default=None)
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config: TrainConfig = field(default=None)
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model_config: dict = field(default_factory=dict)
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executor: BaseExecutor = field(default=None)
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epoch: int = field(default=0)
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consumed_samples: int = field(default=0)
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loss: float = field(default=0.0)
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grad_norm: Optional[float] = field(default=None)
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val_dataloader: Optional[DataLoader] = field(default=None)
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val_loss: Optional[float] = field(default=None)
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world_size: int = field(default=1)
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rank: int = field(default=0)
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kwargs: Dict[str, Any] = field(default_factory=dict)
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_stop_event: threading.Event = field(default_factory=threading.Event)
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@property
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def stop_requested(self) -> bool:
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return self._stop_event.is_set()
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def request_stop(self) -> None:
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self._stop_event.set()
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@property
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def optimizer_step(self) -> int:
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return self.consumed_samples // (
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self.config.batch_per_device
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* self.world_size
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* self.config.grad_accum_steps
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)
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class TrainContextBuilder:
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def __init__(
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self,
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config: TrainConfig,
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):
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self.config = config
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self._param_path: Optional[str] = None
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self._resume: bool = False
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def with_param_path(self, param_path: Optional[str], resume: bool = False) -> Self:
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self._param_path = param_path
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self._resume = resume
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return self
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def build(self) -> TrainContext:
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cfg = self.config
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device = get_current_device()
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executor = ExecutorFactory.create(
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cfg.parallel_mode,
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grad_accum_steps=cfg.grad_accum_steps,
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**cfg.executor_kwargs,
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)
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model_config = {}
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if self._param_path:
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config_path = Path(self._param_path) / "config.json"
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if config_path.exists():
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model_config = load_json(config_path)
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preloaded_state_dict = None
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preloaded_epoch = cfg.start_epoch
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preloaded_consumed = cfg.start_samples * get_world_size()
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preloaded_checkpoint = None
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if self._param_path:
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checkpoint = Checkpoint.load_any(self._param_path)
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if checkpoint is not None:
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preloaded_state_dict = checkpoint.state_dict
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if checkpoint.config:
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model_config = checkpoint.config
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if self._resume:
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preloaded_epoch = checkpoint.epoch
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per_step = (
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cfg.batch_per_device * get_world_size() * cfg.grad_accum_steps
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)
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preloaded_consumed = (
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checkpoint.consumed_samples // per_step
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) * per_step
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preloaded_checkpoint = checkpoint
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if not model_config and hasattr(cfg.model_fn(), "config"):
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model_config = cfg.model_fn().config.to_dict()
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def _before_wrap(m):
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m = m.to(device=device)
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if cfg.lora is not None:
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inject_lora(
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m,
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r=cfg.lora.r,
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alpha=cfg.lora.alpha,
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target_modules=set(cfg.lora.target_modules),
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)
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if preloaded_state_dict is not None:
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m.load_state_dict(preloaded_state_dict, strict=False)
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return m
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context = TrainContext(
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world_size=get_world_size(),
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rank=get_rank(),
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config=cfg,
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model_config=model_config,
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executor=executor,
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epoch=preloaded_epoch,
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consumed_samples=preloaded_consumed,
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checkpoint=preloaded_checkpoint,
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)
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context.model, context.optimizer, context.scheduler = executor.prepare(
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cfg.model_fn,
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cfg.optimizer_fn,
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cfg.scheduler_fn,
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before_wrap=_before_wrap,
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)
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train_dataset = cfg.dataset
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val_dataset = cfg.val_dataset
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if val_dataset is None and cfg.val_split is not None:
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n_total = len(cfg.dataset)
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n_val = max(1, int(n_total * cfg.val_split))
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n_train = n_total - n_val
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generator = torch.Generator().manual_seed(cfg.random_seed)
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train_dataset, val_dataset = random_split(
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cfg.dataset, [n_train, n_val], generator=generator
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)
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sampler_offset = context.consumed_samples // context.world_size
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if self._resume and sampler_offset > 0:
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offset = context.world_size - 1
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num_samples_per_replica = (
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len(train_dataset) + offset
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) // context.world_size
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if num_samples_per_replica > 0:
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context.epoch = sampler_offset // num_samples_per_replica
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sampler = RDSampler(
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data_source=train_dataset,
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start_epoch=context.epoch,
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start_iter=sampler_offset,
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seed=cfg.random_seed,
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)
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context.dataloader = DataLoader(
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train_dataset,
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batch_size=cfg.batch_per_device,
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sampler=sampler,
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num_workers=cfg.num_workers,
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pin_memory=cfg.pin_memory,
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prefetch_factor=cfg.prefetch_factor,
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collate_fn=cfg.collate_fn,
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)
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if val_dataset is not None:
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val_sampler = RDSampler(
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data_source=val_dataset,
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start_epoch=0,
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start_iter=0,
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seed=cfg.random_seed,
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shuffle=False,
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)
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context.val_dataloader = DataLoader(
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val_dataset,
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batch_size=cfg.batch_per_device,
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sampler=val_sampler,
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num_workers=cfg.num_workers,
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pin_memory=cfg.pin_memory,
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prefetch_factor=cfg.prefetch_factor,
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collate_fn=cfg.collate_fn,
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)
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if context.checkpoint and context.checkpoint.extra:
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extra = context.checkpoint.extra
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for name in ("optimizer", "scheduler"):
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if name in extra:
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obj = getattr(context, name, None)
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if obj is not None:
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obj.load_state_dict(extra[name])
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strategy_kwargs = dict(cfg.extra_kwargs)
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needs_ref = cfg.strategy in (
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"dpo",
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"grpo",
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"online_grpo",
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"online_dpo",
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)
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needs_old = cfg.strategy in ("grpo", "online_grpo")
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if needs_ref:
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ref_model = create_ref_model(
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cfg.model_fn, executor.unwrap_model(context.model)
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).to(device=device)
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strategy_kwargs["ref_model"] = ref_model
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old_model = None
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if needs_old:
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old_model = create_ref_model(
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cfg.model_fn, executor.unwrap_model(context.model)
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).to(device=device)
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strategy_kwargs["old_model"] = old_model
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context.strategy = StrategyFactory.create(
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cfg.strategy,
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model=context.model,
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device=device,
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executor=executor,
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**strategy_kwargs,
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)
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# Enable online rollout when the train_type is an ``online_*`` variant.
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is_online = cfg.strategy.startswith("online_")
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if is_online:
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if not context.strategy.supports_online():
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raise ValueError(
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f"Strategy '{cfg.strategy}' does not support online rollout"
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)
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if cfg.reward_model_fn is None:
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raise ValueError("reward_model_fn is required for online RL strategies")
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tokenizer = AutoTokenizer.from_pretrained(self._param_path)
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reward_model = cfg.reward_model_fn()
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group_size = strategy_kwargs.get("group_size", 1)
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rollout_batch_size = group_size * max(1, cfg.batch_per_device)
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max_seq_len = getattr(context.model.config, "max_position_embeddings", None)
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scheduler = InferenceScheduler(
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model=context.model,
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tokenizer=tokenizer,
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max_batch_size=rollout_batch_size,
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max_seq_len=max_seq_len,
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)
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generator = RolloutGenerator(
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scheduler=scheduler,
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tokenizer=tokenizer,
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max_tokens=cfg.rollout_max_tokens,
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group_size=group_size,
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temperature=cfg.rollout_temperature,
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top_k=cfg.rollout_top_k,
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top_p=cfg.rollout_top_p,
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)
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runner = RolloutRunner(
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generator=generator,
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reward_model=reward_model,
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rollout_interval=cfg.rollout_interval,
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)
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context.strategy.set_rollout_runner(runner)
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return context
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