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424 lines
14 KiB
424 lines
14 KiB
# coding=utf-8
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import re
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from pathlib import Path
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from typing import Iterator, List, Mapping, Optional, OrderedDict, Tuple
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import torch
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import torch.nn as nn
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from colossalai.tensor.d_tensor.d_tensor import DTensor
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SAFE_WEIGHTS_NAME = "model.safetensors"
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WEIGHTS_NAME = "pytorch_model.bin"
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SAFE_WEIGHTS_INDEX_NAME = "model.safetensors.index.json"
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WEIGHTS_INDEX_NAME = "pytorch_model.bin.index.json"
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# ======================================
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# General helper functions
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# ======================================
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def calculate_tensor_size(tensor: torch.Tensor) -> float:
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"""
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Calculate the size of a parameter in MB. Used to compute whether a group of params exceed the shard size.
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If so, a new shard should be created.
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Args:
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tensor (torch.Tensor): the tensor to calculate size for.
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Returns:
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float: size of the tensor in MB.
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"""
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return tensor.numel() * tensor.element_size() / 1024 / 1024
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def is_safetensors_available() -> bool:
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"""
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Check whether safetensors is available.
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Returns:
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bool: whether safetensors is available.
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"""
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try:
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import safetensors
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return True
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except ImportError:
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return False
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def is_dtensor_checkpoint(checkpoint_file_path: str) -> bool:
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"""
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Check whether the checkpoint file is a dtensor checkpoint.
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Args:
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checkpoint_file_path (str): path to the checkpoint file.
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Returns:
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bool: whether the checkpoint file is a dtensor checkpoint.
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"""
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if checkpoint_file_path.endswith('.*.safetensors') or checkpoint_file_path.endswith('.*.bin'):
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return True
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else:
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return False
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def is_safetensor_checkpoint(checkpoint_file_path: str) -> bool:
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"""
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Check whether the checkpoint file is a safetensor checkpoint.
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Args:
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checkpoint_file_path (str): path to the checkpoint file.
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Returns:
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bool: whether the checkpoint file is a safetensor checkpoint.
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"""
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if checkpoint_file_path.endswith('.safetensors'):
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return True
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else:
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return False
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# ======================================
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# Helper functions for saving shard file
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# ======================================
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def shard_checkpoint(state_dict: torch.Tensor, max_shard_size: int = 1024) -> Iterator[Tuple[OrderedDict, int]]:
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"""
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Splits a model state dictionary in sub-checkpoints so that the final size of each sub-checkpoint does not exceed a
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given size.
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"""
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current_block = {}
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current_block_size = 0
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for key, weight in state_dict.items():
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ret_block = None
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ret_block_size = 0
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if type(weight) != DTensor:
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weight_size = calculate_tensor_size(weight)
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# If this weight is going to tip up over the maximal size, we split.
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if current_block_size + weight_size > max_shard_size:
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ret_block = current_block
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ret_block_size = current_block_size
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current_block = {}
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current_block_size = 0
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current_block[key] = weight
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current_block_size += weight_size
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if ret_block != None:
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yield ret_block, ret_block_size
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yield current_block, current_block_size
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def load_shard_state_dict(checkpoint_file: Path, use_safetensors: bool = False):
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"""
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load shard state dict into model
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"""
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if use_safetensors and not checkpoint_file.suffix == ".safetensors":
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raise Exception("load the model using `safetensors`, but no file endwith .safetensors")
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if use_safetensors:
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from safetensors.torch import load_file as safe_load_file
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from safetensors.torch import safe_open
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with safe_open(checkpoint_file, framework="pt") as f:
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metadata = f.metadata()
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if metadata["format"] != "pt":
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raise NotImplementedError(
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f"Conversion from a {metadata['format']} safetensors archive to PyTorch is not implemented yet.")
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return safe_load_file(checkpoint_file)
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else:
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return torch.load(checkpoint_file)
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def load_state_dict_into_model(model: nn.Module,
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state_dict: torch.Tensor,
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missing_keys: List,
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strict: bool = False,
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load_sub_module: bool = True):
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r"""Copies parameters and buffers from :attr:`state_dict` into
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this module and its descendants.
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Args:
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state_dict (dict): a dict containing parameters and
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persistent buffers.
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"""
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if not isinstance(state_dict, Mapping):
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raise TypeError("Expected state_dict to be dict-like, got {}.".format(type(state_dict)))
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unexpected_keys: List[str] = []
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sub_missing_keys: List[str] = []
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error_msgs: List[str] = []
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# copy state_dict so _load_from_state_dict can modify it
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metadata = getattr(state_dict, '_metadata', None)
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state_dict = OrderedDict(state_dict)
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if metadata is not None:
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state_dict._metadata = metadata
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def load(module: nn.Module, state_dict, prefix="", load_sub_module: bool = True):
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local_metadata = {} if metadata is None else metadata.get(prefix[:-1], {})
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args = (state_dict, prefix, local_metadata, True, sub_missing_keys, [], error_msgs)
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# Parameters of module and children will start with prefix. We can exit early if there are none in this
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# state_dict
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if len([key for key in state_dict if key.startswith(prefix)]) > 0:
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module._load_from_state_dict(*args)
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if load_sub_module:
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for name, child in module._modules.items():
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if child is not None:
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load(child, state_dict, prefix + name + ".")
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load(model, state_dict, "", load_sub_module)
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del load
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missing_keys = missing_keys.append(sub_missing_keys)
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if strict:
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if len(unexpected_keys) > 0:
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error_msgs = 'Unexpected key(s) in state_dict: {}. '.format(', '.join(
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'"{}"'.format(k) for k in unexpected_keys))
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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(error_msgs)))
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# ======================================
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# Helper functions for saving state dict
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# ======================================
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def save_state_dict(state_dict: dict, checkpoint_file_path: str, use_safetensors: bool) -> None:
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"""
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Save state dict to checkpoint.
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Args:
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state_dict (dict): state dict.
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checkpoint_file_path (str): path to the checkpoint file.
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use_safetensors (bool): whether to use safetensors to save the checkpoint.
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"""
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if use_safetensors:
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assert is_safetensors_available(), "safetensors is not available."
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assert checkpoint_file_path.endswith('.safetensors'), \
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"safetensors only supports .safetensors suffix for checkpoint file."
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from safetensors.torch import save_file as safe_save_file
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safe_save_file(state_dict, checkpoint_file_path, metadata={"format": "pt"})
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else:
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torch.save(state_dict, checkpoint_file_path)
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def save_dtensor(name: str, tensor: torch.Tensor, index_file: "CheckpointIndexFile", use_safetensors: bool) -> None:
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"""
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Save distributed tensor to checkpoint. This checkpoint will be a dictionary which contains
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only one tensor.
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Args:
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tensor (Tensor): tensor to be saved.
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index_file (CheckpointIndexFile): path to the checkpoint file.
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size_per_shard (int): size per shard in MB.
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"""
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root_path = index_file.root_path
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output_root_path = root_path.joinpath('dtensor')
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# create directory
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output_root_path.mkdir(exist_ok=True)
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# save tensor to this directory
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# TODO(YuliangLiu): get index of the tensor shard
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# e.g. index =
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index = 0
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# save tensor to file
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ckpt_file_name = generate_dtensor_file_name(name, index, use_safetensors)
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ckpt_file_path = output_root_path.joinpath(ckpt_file_name)
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# dtensor ckpt file always contains only one tensor
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state_dict = {name: tensor}
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save_state_dict(state_dict, str(ckpt_file_path), use_safetensors)
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# update the weight map
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# * means all shards
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ckpt_file_name_in_weight_map = 'dtensor/' + generate_dtensor_file_name(name, '*', use_safetensors)
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index_file.append_weight_map(name, ckpt_file_name_in_weight_map)
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def get_checkpoint_file_suffix(use_safetensors: bool) -> str:
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"""
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Get checkpoint file suffix.
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Args:
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use_safetensors (bool): whether to use safetensors to save the checkpoint.
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Returns:
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str: checkpoint file suffix.
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"""
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if use_safetensors:
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return '.safetensors'
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else:
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return '.bin'
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def generate_checkpoint_shard_file_name(index: int,
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total_number: int,
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use_safetensors: bool,
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prefix: str = None) -> str:
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"""
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Generate checkpoint shard file name.
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Args:
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index (int): index of the shard.
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total_number (int): total number of shards.
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use_safetensors (bool): whether to use safetensors to save the checkpoint.
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prefix (str): prefix of the shard file name. Default: None.
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Returns:
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str: checkpoint shard file name.
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"""
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suffix = get_checkpoint_file_suffix(use_safetensors)
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if prefix is None:
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return f"{index:05d}-of-{total_number:05d}.{suffix}"
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else:
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return f"{prefix}-{index:05d}-of-{total_number:05d}.{suffix}"
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def generate_dtensor_file_name(param_name: str, index: int, use_safetensors: bool) -> str:
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"""
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Generate dtensor file name.
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Args:
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param_name (str): name of the distributed parameter.
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index (int): index of the shard.
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use_safetensors (bool): whether to use safetensors to save the checkpoint.
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Returns:
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str: dtensor file name.
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"""
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suffix = get_checkpoint_file_suffix(use_safetensors)
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return f'{param_name}.{index}.{suffix}'
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def save_state_dict_as_shard(
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state_dict: dict,
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checkpoint_path: str,
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index: int,
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total_number: int,
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use_safetensors: bool,
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prefix: str = None,
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) -> None:
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"""
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Save state dict as shard.
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Args:
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state_dict (dict): state dict.
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checkpoint_path (str): path to the checkpoint file.
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index (int): index of the shard.
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total_number (int): total number of shards.
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prefix (str): prefix of the shard file name.
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use_safetensors (bool): whether to use safetensors to save the checkpoint.
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"""
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# generate the shard name
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shard_file_name = generate_checkpoint_shard_file_name(index, total_number, use_safetensors, prefix)
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shard_file_path = Path(checkpoint_path).joinpath(shard_file_name).absolute()
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# save the shard
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save_state_dict(state_dict, str(shard_file_path), use_safetensors)
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# ========================================
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# Helper functions for loading state dict
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# ========================================
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def has_index_file(checkpoint_path: str) -> Tuple[bool, Optional[Path]]:
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"""
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Check whether the checkpoint has an index file.
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Args:
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checkpoint_path (str): path to the checkpoint.
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Returns:
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Tuple[bool, Optional[Path]]: a tuple of (has_index_file, index_file_path)
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"""
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checkpoint_path = Path(checkpoint_path)
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if checkpoint_path.is_file():
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# check if it is .index.json
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reg = re.compile("(.*?).index((\..*)?).json")
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if reg.fullmatch(checkpoint_path.name) is not None:
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return True, checkpoint_path
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else:
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return False, None
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elif checkpoint_path.is_dir():
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# check if there is only one a file ending with .index.json in this directory
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index_files = list(checkpoint_path.glob('*.index.*json'))
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# if we found a .index.json file, make sure there is only one
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if len(index_files) > 0:
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assert len(
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index_files
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) == 1, f'Expected to find one .index.json file in {checkpoint_path}, but found {len(index_files)}'
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if len(index_files) == 1:
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return True, index_files[0]
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else:
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return False, None
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else:
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raise RuntimeError(f'Invalid checkpoint path {checkpoint_path}. Expected a file or a directory.')
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def load_state_dict(checkpoint_file_path: Path):
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"""
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Load state dict from checkpoint.
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Args:
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checkpoint_file_path (Path): path to the checkpoint file.
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Returns:
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dict: state dict.
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"""
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assert not is_dtensor_checkpoint(checkpoint_file_path), \
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f'Cannot load state dict from dtensor checkpoint {checkpoint_file_path}, you should convert the distributed tensors to gathered tensors with our CLI offline.'
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if is_safetensor_checkpoint(checkpoint_file_path):
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assert is_safetensors_available(), \
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f'Cannot load state dict from safetensor checkpoint {checkpoint_file_path}, because safetensors is not available. Please install safetensors first with pip install safetensors.'
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# load with safetensors
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from safetensors import safe_open
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state_dict = {}
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with safe_open(checkpoint_file_path, framework="pt", device="cpu") as f:
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for k in f.keys():
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state_dict[k] = f.get_tensor(k)
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return state_dict
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else:
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# load with torch
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return torch.load(checkpoint_file_path)
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def add_variant(weights_name: str, variant: Optional[str] = None) -> str:
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if variant is not None and len(variant) > 0:
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splits = weights_name.split(".")
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splits = splits[:-1] + [variant] + splits[-1:]
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weights_name = ".".join(splits)
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return weights_name
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def get_base_filenames(variant: str = None, use_safetensors: bool = False):
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"""
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generate base weight filenames
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"""
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weights_name = SAFE_WEIGHTS_NAME if use_safetensors else WEIGHTS_NAME
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weights_name = add_variant(weights_name, variant)
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save_index_file = SAFE_WEIGHTS_INDEX_NAME if use_safetensors else WEIGHTS_INDEX_NAME
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save_index_file = add_variant(save_index_file, variant)
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return weights_name, save_index_file
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def get_shard_filename(weights_name: str, idx: int):
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"""
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get shard file name
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"""
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shard_file = weights_name.replace(".bin", f"-{idx+1:05d}.bin")
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shard_file = shard_file.replace(".safetensors", f"-{idx + 1:05d}.safetensors")
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return shard_file
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