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257 lines
11 KiB
257 lines
11 KiB
from collections import OrderedDict
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from itertools import chain
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import torch
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import torch.distributed as dist
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from colossalai.communication.collective import scatter_object_list
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from colossalai.context.parallel_mode import ParallelMode
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from colossalai.core import global_context as gpc
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try:
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from torch.nn.modules.module import _EXTRA_STATE_KEY_SUFFIX
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except ImportError:
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_EXTRA_STATE_KEY_SUFFIX = '_extra_state'
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from .common import is_using_pp
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__all__ = ["save_checkpoint", "load_checkpoint"]
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def broadcast_state_dict(state_dict, parallel_mode):
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state_dict = [state_dict.copy() if isinstance(state_dict, dict) else state_dict]
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src_rank = gpc.get_ranks_in_group(parallel_mode)[0]
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dist.broadcast_object_list(state_dict, src=src_rank, group=gpc.get_cpu_group(parallel_mode))
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return state_dict[0]
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def partition_tensor_parallel_state_dict(state_dict: OrderedDict,
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parallel_mode: ParallelMode,
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dims: dict = dict(),
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partition_states: dict = dict()):
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src_rank = gpc.get_ranks_in_group(parallel_mode)[0]
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depth = gpc.get_world_size(parallel_mode)
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group = gpc.get_cpu_group(parallel_mode)
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is_rank0 = gpc.get_local_rank(parallel_mode) == 0
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partition_info = [None]
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if is_rank0:
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partition_info_dict = OrderedDict()
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for key, param in state_dict.items():
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dim = dims[key]
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is_partitioned = partition_states[key]
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shape = list(param.shape)
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if is_partitioned:
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shape[dim] = shape[dim] // depth
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partition_info_dict[key] = (is_partitioned, param.dtype, shape, dim)
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partition_info[0] = partition_info_dict
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dist.broadcast_object_list(partition_info, src_rank, group=group)
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partitioned_state = OrderedDict()
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for key, (is_partitioned, dtype, shape, dim) in partition_info[0].items():
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if is_partitioned:
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output = torch.empty(shape, dtype=dtype)
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if is_rank0:
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scatter_list = [t.contiguous() for t in state_dict[key].chunk(depth, dim)]
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else:
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scatter_list = None
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dist.scatter(output, scatter_list, src_rank, group=group)
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else:
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if is_rank0:
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output = state_dict[key]
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else:
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output = torch.empty(shape, dtype=dtype)
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dist.broadcast(output, src_rank, group=group)
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partitioned_state[key] = output
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return partitioned_state
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def gather_tensor_parallel_state_dict(
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state_dict: OrderedDict,
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parallel_mode: ParallelMode,
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dims: dict = dict(),
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partition_states: dict = dict(),
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keep_vars: bool = False,
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):
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dst_rank = gpc.get_ranks_in_group(parallel_mode)[0]
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depth = gpc.get_world_size(parallel_mode)
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for key in list(state_dict.keys()):
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param = state_dict.pop(key)
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param = param if keep_vars else param.detach()
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dim = dims.get(key, 0)
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do_partition = partition_states.get(key, True)
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if do_partition:
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temp = param.transpose(0, dim).contiguous()
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gather_list = None
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if gpc.get_local_rank(parallel_mode) == 0:
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shape = list(param.shape)
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shape[0], shape[dim] = shape[dim], shape[0]
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shape[0] *= depth
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param = torch.empty(shape, dtype=param.dtype, device=param.device)
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gather_list = list(torch.chunk(param, depth, dim=0))
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dist.gather(temp, gather_list, dst=dst_rank, group=gpc.get_cpu_group(parallel_mode))
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param = torch.transpose(param, 0, dim)
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# update params in state_dict only on local rank 0
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if gpc.get_local_rank(parallel_mode) == 0:
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state_dict[key] = param
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return state_dict
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def _send_state_dict(state_dict, dst, parallel_mode):
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state_tensor, state_size = dist.distributed_c10d._object_to_tensor(state_dict)
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dist.send(state_size, dst, group=gpc.get_cpu_group(parallel_mode))
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dist.send(state_tensor, dst, group=gpc.get_cpu_group(parallel_mode))
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def _recv_state_dict(src, parallel_mode):
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state_size = torch.tensor([0], dtype=torch.long)
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dist.recv(state_size, src, group=gpc.get_cpu_group(parallel_mode))
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state_tensor = torch.empty(state_size.item(), dtype=torch.uint8)
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dist.recv(state_tensor, src, group=gpc.get_cpu_group(parallel_mode))
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state_dict = dist.distributed_c10d._tensor_to_object(state_tensor, state_size)
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return state_dict
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def partition_pipeline_parallel_state_dict(model, state_dict):
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pipeline_state = OrderedDict()
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if gpc.get_local_rank(ParallelMode.TENSOR) == 0:
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# receive all states from prev stage
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if not gpc.is_first_rank(ParallelMode.PIPELINE):
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state_dict = _recv_state_dict(gpc.get_prev_global_rank(ParallelMode.PIPELINE), ParallelMode.PIPELINE)
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# move states to output
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for name, _ in model.named_parameters(recurse=True):
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if name in state_dict:
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pipeline_state[name] = state_dict.pop(name)
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for name, _ in model.named_buffers(recurse=True):
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if name in state_dict:
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pipeline_state[name] = state_dict.pop(name)
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for name, _ in model.named_modules():
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extra_state_key = name + "." + _EXTRA_STATE_KEY_SUFFIX
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if extra_state_key in state_dict:
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pipeline_state[extra_state_key] = state_dict.pop(extra_state_key)
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# send rest states to next stage
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if not gpc.is_last_rank(ParallelMode.PIPELINE):
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_send_state_dict(state_dict, gpc.get_next_global_rank(ParallelMode.PIPELINE), ParallelMode.PIPELINE)
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return pipeline_state
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def gather_pipeline_parallel_state_dict(state_dict):
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gathered_states = ([None for _ in range(gpc.get_world_size(ParallelMode.PIPELINE))]
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if gpc.get_local_rank(ParallelMode.PIPELINE) == 0 else None)
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dist.gather_object(
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state_dict,
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gathered_states,
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dst=gpc.get_ranks_in_group(ParallelMode.PIPELINE)[0],
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group=gpc.get_cpu_group(ParallelMode.PIPELINE),
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)
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state_dict = (OrderedDict(chain.from_iterable(state.items() for state in gathered_states))
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if gpc.get_local_rank(ParallelMode.PIPELINE) == 0 else OrderedDict())
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return state_dict
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def save_checkpoint(file,
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epoch: int,
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model: torch.nn.Module,
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optimizer: torch.optim.Optimizer = None,
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lr_scheduler: torch.optim.lr_scheduler._LRScheduler = None,
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**kwargs):
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"""Stores the checkpoint to disk. Saves all the training components' parameters or buffers, such as model, optimizer,
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lr_scheduler etc. into a checkpoint dictionary.
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Args:
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file: a file-like object (has to implement write and flush) or a string or os.PathLike object containing a
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file name.
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epoch (int): Epoch number (indicates how many epochs have you trained this model).
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model (:class:`torch.nn.Module`): Model to be saved.
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optimizer (Union[:class:`torch.optim.Optimizer`, :class:`colossalai.nn.optimizer`]): Optimizer to be saved.
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lr_scheduler (Union[:class:`torch.optim.lr_scheduler`, :class:`colossalai.nn.lr_scheduler`], optional):
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lr_scheduler to be saved, defaults to None.
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pickle_module: module used for pickling metadata and objects
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pickle_protocol: can be specified to override the default protocol
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"""
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# ckpt container
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checkpoint = {"epoch": epoch}
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model_state = model.state_dict()
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if is_using_pp() and gpc.get_local_rank(ParallelMode.TENSOR) == 0:
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model_state = gather_pipeline_parallel_state_dict(model_state)
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if gpc.get_global_rank() == 0:
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checkpoint["model"] = model_state
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# if optimizer is not None:
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# checkpoint['optimizer'] = optimizer.state_dict()
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# if lr_scheduler is not None:
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# checkpoint['lr_scheduler'] = lr_scheduler.state_dict()
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torch.save(checkpoint, file, **kwargs)
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def load_checkpoint(
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file,
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model: torch.nn.Module,
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optimizer: torch.optim.Optimizer = None,
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lr_scheduler: torch.optim.lr_scheduler._LRScheduler = None,
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strict: bool = True,
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):
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"""Loads training states from a checkpoint file.
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Args:
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file: a file-like object (has to implement read(), readline(), tell(), and seek()), or a string or os.PathLike
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object containing a file name.
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model (:class:`torch.nn.Module`): Model to load saved weights and buffers.
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optimizer (Union[:class:`torch.optim.Optimizer`, :class:`colossalai.nn.optimizer`]): Optimizer to recuperate.
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lr_scheduler (:class:`torch.optim.lr_scheduler._LRScheduler`, optional):
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lr_scheduler to recuperate, defaults to None.
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strict (bool, optional): Whether to strictly enforce that the keys in :attr:`state_dict`
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of the checkpoint match the names of parameters and buffers in model, defaults to True.
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Returns:
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int: The saved epoch number.
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Raises:
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RuntimeError: Raise error if the model/optimizer cannot successfully be recuperated
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"""
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state_dict = (torch.load(file, map_location=torch.device("cpu"))
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if gpc.get_local_rank(ParallelMode.MODEL) == 0 else None)
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# model states
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model_state = state_dict.pop("model") if state_dict is not None else dict()
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# pipeline
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if is_using_pp():
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model_state = partition_pipeline_parallel_state_dict(model, model_state)
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try:
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model.load_state_dict(model_state, strict=strict)
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except RuntimeError as e:
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error_msgs = str(e)
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if error_msgs.startswith("Error(s) in loading state_dict for "):
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error_msgs = error_msgs.split("\n\t")[1:]
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dst_rank = gpc.get_ranks_in_group(ParallelMode.MODEL)[0]
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all_error_msgs = [None for _ in range(gpc.get_world_size(ParallelMode.MODEL))]
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dist.gather_object(error_msgs, all_error_msgs, dst=dst_rank, group=gpc.get_cpu_group(ParallelMode.MODEL))
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if gpc.get_global_rank() == 0:
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all_error_msgs = list(chain.from_iterable(all_error_msgs))
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raise RuntimeError("Error(s) in loading state_dict for {}:\n\t{}".format(
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model.__class__.__name__, "\n\t".join(all_error_msgs)))
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else:
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raise e
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# broadcast the rest states
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state_dict = broadcast_state_dict(state_dict, ParallelMode.MODEL)
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# # optimizer states
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# if optimizer is not None and 'optimizer' in state_dict:
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# optimizer.load_state_dict(state_dict['optimizer'])
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# # lr scheduler states
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# if lr_scheduler is not None and 'lr_scheduler' in state_dict:
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# lr_scheduler.load_state_dict(state_dict['lr_scheduler'])
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# last epoch
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last_epoch = state_dict.pop("epoch", -1)
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return last_epoch
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