97 lines
3.1 KiB
Python
97 lines
3.1 KiB
Python
from dataclasses import dataclass, field
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from typing import Optional, Self
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import torch.nn as nn
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from torch.optim import Optimizer
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from torch.optim.lr_scheduler import LRScheduler
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from torch.utils.data import DataLoader
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from astrai.config.train_config import TrainConfig
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from astrai.dataset import ResumableDistributedSampler
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from astrai.parallel.setup import get_current_device, get_rank, get_world_size
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from astrai.serialization import Checkpoint
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from astrai.trainer.strategy import BaseStrategy, StrategyFactory
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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: Optimizer = field(default=None)
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scheduler: LRScheduler = field(default=None)
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checkpoint: Checkpoint = field(default=None)
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epoch: int = field(default=0)
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iteration: int = field(default=0)
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loss: float = field(default=0.0)
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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 = field(default_factory=dict)
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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._checkpoint: Optional[Checkpoint] = None
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def with_checkpoint(self, checkpoint: Optional[Checkpoint]) -> Self:
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self._checkpoint = checkpoint
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return self
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def build(self) -> TrainContext:
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context = TrainContext(
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model=self.config.model,
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world_size=get_world_size(),
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rank=get_rank(),
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)
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device = get_current_device()
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context.model = context.model.to(device=device)
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if self.config.nprocs > 1 and self.config.parallel_wrapper:
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context.model = self.config.parallel_wrapper(context.model)
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if self._checkpoint is not None:
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context.epoch = max(self._checkpoint.epoch, self.config.start_epoch)
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context.iteration = max(self._checkpoint.iteration, self.config.start_batch)
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context.model.load_state_dict(self._checkpoint.state_dict)
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context.checkpoint = self._checkpoint
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else:
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context.checkpoint = Checkpoint(
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state_dict=context.model.state_dict(),
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)
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context.optimizer = self.config.optimizer_fn(context.model)
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context.scheduler = self.config.scheduler_fn(context.optimizer)
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cfg = self.config
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sampler_offset = context.iteration * cfg.batch_per_device
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sampler = ResumableDistributedSampler(
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data_source=cfg.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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cfg.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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)
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context.strategy = StrategyFactory.create(
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model=context.model,
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train_type=self.config.strategy,
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device=device,
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**self.config.extra_kwargs,
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)
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return context
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