393 lines
9.9 KiB
Python
393 lines
9.9 KiB
Python
from torch import Tensor
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from typing import Any, Protocol
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Stats = dict[str, float]
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class TrainFeeder(Protocol):
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def __call__(
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self, *, engine: "Engine", batch: Any
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) -> None | tuple[Tensor, Stats]:
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...
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def default_feeder(engine, batch):
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if isinstance(batch, list):
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engine( *batch )
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elif isinstance(batch, dict):
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engine( **batch )
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else:
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engine( batch )
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losses = engine.gather_attribute("loss")
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loss = torch.stack([*losses.values()]).sum()
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stats = {}
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stats |= {k: v.item() for k, v in losses.items()}
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return loss, stats
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from ..config import cfg
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from ..utils import dispatch_attribute, flatten_dict, gather_attribute, do_gc, to_device
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from ..utils.distributed import init_distributed, distributed_initialized
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import logging
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import time
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import torch
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import torch.distributed
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import os
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from torch import Tensor
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from torch.distributed import all_reduce
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from typing import Any, Protocol
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from .base import TrainFeeder
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_logger = logging.getLogger(__name__)
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if not distributed_initialized() and cfg.trainer.backend == "local":
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init_distributed(torch.distributed.init_process_group)
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# A very naive engine implementation using barebones PyTorch
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class Engine():
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def __init__(self, *args, **kwargs):
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self.module = kwargs['model'].to(cfg.device).to(cfg.trainer.dtype)
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self.optimizer = kwargs['optimizer'] if 'optimizer' in kwargs else None
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self.lr_scheduler = kwargs['lr_scheduler'] if 'lr_scheduler' in kwargs else None
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self.global_steps = 0
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self.micro_steps = 0
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self.gradient_accumulation_steps = cfg.hyperparameters.gradient_accumulation_steps
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def freeze(self):
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for p in self.module.parameters():
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if p.requires_grad:
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p.requires_grad_(False)
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self._frozen_params.add(p)
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def unfreeze(self):
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for p in self._frozen_params:
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p.requires_grad_(True)
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self._frozen_params.clear()
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@property
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def global_step(self):
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return self.global_steps
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@property
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def micro_step(self):
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return self.micro_steps
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def train_batch_size(self):
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return cfg.hyperparameters.batch_size
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def gather_attribute(self, *args, **kwargs):
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return gather_attribute(self.module, *args, **kwargs)
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def dispatch_attribute(self, *args, **kwargs):
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return dispatch_attribute(self.module, *args, **kwargs)
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def save_checkpoint(self, save_dir, tag ):
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save_path = save_dir / tag / "state.pth"
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save_path.parent.mkdir(parents=True, exist_ok=True)
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torch.save({
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"global_step": self.global_step,
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"micro_step": self.micro_step,
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"module": self.module.state_dict(),
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"optimizer": self.optimizer.state_dict() if self.optimizer is not None else None,
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"lr_scheduler": self.lr_scheduler.state_dict() if self.lr_scheduler is not None else None,
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}, save_path)
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open(save_dir / "latest", 'w').write( tag )
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def load_checkpoint(self, load_dir, tag=None, load_module_strict=True, load_optimizer_states=True, load_lr_scheduler_states=True):
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if tag is None:
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tag_path = load_dir / "latest"
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if not tag_path.exists():
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return
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tag = open(tag_path).read()
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load_path = load_dir / tag / "state.pth"
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if not load_path.exists():
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return
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state = torch.load(load_path)
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self.global_steps = state['global_step']
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self.micro_steps = state['micro_step']
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self.module.load_state_dict(state['module'])
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load_optimizer_states = load_optimizer_states and self.optimizer is not None and 'optimizer' in state
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load_lr_scheduler_states = load_lr_scheduler_states and self.lr_scheduler is not None and 'lr_scheduler' in state
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if load_optimizer_states:
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self.optimizer.load_state_dict(state['optimizer'])
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if load_lr_scheduler_states:
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self.lr_scheduler.load_state_dict(state['lr_scheduler'])
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def eval(self):
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return self.module.eval()
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def train(self):
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return self.module.train()
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def to(self, *args, **kwargs):
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self.module = self.module.to(*args, **kwargs)
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return self.module
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def __call__(self, *args, **kwargs):
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return self.forward(*args, **kwargs)
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def forward(self, *args, **kwargs):
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return self.module.forward(*args, **kwargs)
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def backward(self, loss):
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return (loss / self.gradient_accumulation_steps).backward()
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def step(self):
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with torch.set_grad_enabled(self.gradient_accumulation_steps > 1):
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self.micro_steps += 1
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if (self.micro_steps + 1) % max(1, self.gradient_accumulation_steps) == 0:
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self.global_steps += 1
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self.optimizer.step()
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self.optimizer.zero_grad()
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def get_lr(self):
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lrs = []
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for param_group in self.optimizer.param_groups:
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if 'lr' in param_group:
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lrs.append(param_group['lr'])
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return lrs
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def set_lr(self, lr):
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for param_group in self.optimizer.param_groups:
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if 'lr' in param_group:
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param_group['lr'] = lr
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def get_global_grad_norm(self):
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return 0.0
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def traverse(self, *args, **kwargs):
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self.forward(*args, **kwargs)
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losses = self.gather_attribute("loss")
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loss = torch.stack([*losses.values()]).sum()
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stats = {}
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stats |= {k: v.item() for k, v in losses.items()}
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stats |= self.gather_attribute("scalar")
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self.backward(loss)
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self.step()
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return stats
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# and now to ignore everything from the above
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class Engines(dict[str, Engine]):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.setup()
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def setup(self):
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self._global_step = 0
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self._micro_step = 0
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@property
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def global_step(self):
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return self._global_step
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@property
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def micro_step(self):
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return self._micro_step
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def gather_attribute(self, *args, **kwargs):
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ret = {}
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for engine in self.values():
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ret |= engine.gather_attribute(*args, **kwargs)
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return ret
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def dispatch_attribute(self, *args, **kwargs):
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for engine in self.values():
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engine.dispatch_attribute(*args, **kwargs)
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def save_checkpoint(self, tag=None):
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if not tag:
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tag = cfg.trainer.save_tag
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tag = tag.lower()
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if tag[:2] == "it" or tag[:4] == "step":
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tag = f'{self.global_step}'
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cfg.ckpt_dir.mkdir(parents=True, exist_ok=True)
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for name, engine in self.items():
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engine.save_checkpoint(cfg.ckpt_dir / name, tag=tag)
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def load_checkpoint(self, tag=None):
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if not tag:
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tag = cfg.trainer.load_tag
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for name, engine in self.items():
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load_dir = cfg.ckpt_dir / name
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engine.load_checkpoint(
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tag=tag,
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load_dir=load_dir,
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load_module_strict=cfg.trainer.strict_loading,
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load_optimizer_states=cfg.trainer.load_states,
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load_lr_scheduler_states=cfg.trainer.load_states,
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)
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if cfg.trainer.restart_step_count:
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engine.global_steps = 0
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# update the LR because for some god awful reason it gets overwritten when loading from a checkpoint but only when it's not using a scheduler
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if cfg.hyperparameters.scheduler_type == "":
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self.set_lr(cfg.hyperparameters.learning_rate)
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self._update_global_step()
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self._update_micro_step()
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def set_lr(self, lr):
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for engine in self.values():
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engine.set_lr(lr)
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def _update_global_step(self):
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for engine in self.values():
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self._global_step = max(self._global_step, engine.global_step)
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def _update_micro_step(self):
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for engine in self.values():
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self._micro_step = max(self._micro_step, engine.micro_step)
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def train_batch_size(self):
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batch_size = 0
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for engine in self.values():
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batch_size = max(batch_size, engine.train_batch_size())
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def eval(self):
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for engine in self.values():
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engine.eval()
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def train(self):
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for engine in self.values():
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engine.train()
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def traverse(self):
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stats = {}
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for name, engine in self.items():
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stat = engine.traverse()
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stats.update(flatten_dict({ name.split("-")[0]: stat }))
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return stats
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def step(self, batch, feeder: TrainFeeder = default_feeder, device=torch.cuda.current_device()):
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total_elapsed_time = 0
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stats: Any = dict()
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if cfg.trainer.gc_mode == 'step':
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do_gc()
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batch = to_device(batch, device)
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for name, engine in self.items():
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#torch.cuda.synchronize()
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if cfg.trainer.gc_mode == 'substep':
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do_gc()
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start_time = time.time()
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tries = 4
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n_ooms = torch.zeros([], device=cfg.device)
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if cfg.trainer.aggressive_optimizations:
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batch = to_device(batch, device)
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if not cfg.trainer.check_for_oom:
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res = feeder( engine=engine, batch=batch )
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else:
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while tries >= 0:
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try:
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res = feeder( engine=engine, batch=batch )
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break
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except RuntimeError as e:
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print("Forward", str(e))
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if "out of memory" not in str(e):
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self.save_checkpoint()
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raise e
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# shrink batch size until it's happy
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for k in batch:
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batch[k] = batch[k][:-1]
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if tries <= 0:
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# trigger OOM
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n_ooms += 1
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else:
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# also do GC
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do_gc()
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continue
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all_reduce(n_ooms)
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if n_ooms.item() > 0:
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self.save_checkpoint()
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raise RuntimeError("Out of memory during forward pass!")
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if res is None:
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continue
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loss, engine_stats = res
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engine_stats |= self.gather_attribute("scalar")
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n_ooms = torch.zeros([], device=cfg.device)
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if cfg.trainer.aggressive_optimizations:
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batch = to_device(batch, 'cpu')
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if not cfg.trainer.check_for_oom:
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engine.backward(loss)
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else:
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try:
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engine.backward(loss)
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except RuntimeError as e:
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print("Backwards:", str(e))
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if "out of memory" not in str(e):
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self.save_checkpoint()
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raise e
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n_ooms += 1
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all_reduce(n_ooms)
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if n_ooms.item() > 0:
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self.save_checkpoint()
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raise RuntimeError("Out of memory during backwards pass!")
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engine.step()
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#torch.cuda.synchronize()
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elapsed_time = time.time() - start_time
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total_elapsed_time += elapsed_time
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stats.update(
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flatten_dict(
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{
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name.split("-")[0]: dict(
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loss=loss.item(),
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lr=engine.get_lr()[0],
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grad_norm=engine.get_global_grad_norm(), # This norm is delayed but global and avoids extra computation
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elapsed_time=elapsed_time,
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engine_step=engine.global_step,
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**engine_stats,
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)
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}
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),
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)
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self._update_global_step()
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self._update_micro_step()
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stats["batch_size"] = self.train_batch_size() # len(batch["text"])
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stats["elapsed_time"] = total_elapsed_time
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stats["wall_time"] = time.time()
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stats["global_step"] = self.global_step
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return stats
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