mirror of
https://github.com/gpt-omni/mini-omni
synced 2024-11-16 05:03:47 +00:00
642 lines
23 KiB
Python
642 lines
23 KiB
Python
# Copyright Lightning AI. Licensed under the Apache License 2.0, see LICENSE file.
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"""Utility functions for training and inference."""
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import inspect
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import math
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import os
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import pickle
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import shutil
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import sys
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from dataclasses import asdict, is_dataclass
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from io import BytesIO
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from pathlib import Path
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from typing import (
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TYPE_CHECKING,
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Any,
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Dict,
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Iterable,
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List,
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Literal,
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Mapping,
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Optional,
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TypeVar,
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Union,
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)
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import lightning as L
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import torch
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import torch.nn as nn
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import torch.utils._device
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import yaml
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from lightning.fabric.loggers import CSVLogger, TensorBoardLogger
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from lightning.fabric.strategies import FSDPStrategy
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from lightning.fabric.utilities.load import _lazy_load as lazy_load
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from lightning.pytorch.loggers import WandbLogger
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from lightning.pytorch.cli import instantiate_class
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from torch.serialization import normalize_storage_type
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from typing_extensions import Self
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if TYPE_CHECKING:
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from litgpt import GPT, Config
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def init_out_dir(out_dir: Path) -> Path:
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if not out_dir.is_absolute() and "LIGHTNING_ARTIFACTS_DIR" in os.environ:
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return Path(os.getenv("LIGHTNING_ARTIFACTS_DIR")) / out_dir
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return out_dir
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def find_resume_path(
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resume: Union[bool, Literal["auto"], Path], out_dir: Path
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) -> Optional[Path]:
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if not resume or isinstance(resume, Path):
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return resume
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resume_path = max(
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out_dir.rglob("step-*/*.pth"),
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key=(lambda p: int(p.parent.name.split("-")[1])),
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default=None,
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)
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if resume == "auto":
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return resume_path
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if resume is True and resume_path is None:
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raise FileNotFoundError(
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f"You passed `--resume=True`, but no checkpont file was found in `--out_dir={out_dir}`."
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)
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return resume_path
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def find_multiple(n: int, k: int) -> int:
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assert k > 0
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if n % k == 0:
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return n
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return n + k - (n % k)
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def num_parameters(module: nn.Module, requires_grad: Optional[bool] = None) -> int:
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total = 0
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for p in module.parameters():
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if requires_grad is None or p.requires_grad == requires_grad:
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if hasattr(p, "quant_state"):
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# bitsandbytes 4bit layer support
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total += math.prod(p.quant_state.shape)
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else:
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total += p.numel()
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return total
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def reset_parameters(module: nn.Module) -> None:
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"""Calls `reset_parameters` on the module and all its submodules."""
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for mod in module.modules():
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if callable(getattr(mod, "reset_parameters", None)):
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mod.reset_parameters()
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def check_valid_checkpoint_dir(
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checkpoint_dir: Path,
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model_filename: str = "lit_model.pth",
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verbose: bool = True,
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raise_error: bool = False,
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) -> None:
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files = {
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model_filename: (checkpoint_dir / model_filename).is_file(),
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"model_config.yaml": (checkpoint_dir / "model_config.yaml").is_file(),
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"tokenizer.json OR tokenizer.model": (
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checkpoint_dir / "tokenizer.json"
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).is_file()
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or (checkpoint_dir / "tokenizer.model").is_file(),
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"tokenizer_config.json": (checkpoint_dir / "tokenizer_config.json").is_file(),
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}
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if checkpoint_dir.is_dir():
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if all(files.values()):
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# we're good
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return
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problem = f" is missing the files: {[f for f, exists in files.items() if not exists]!r}"
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else:
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problem = " is not a checkpoint directory"
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# list locally available checkpoints
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available = list(Path("checkpoints").glob("*/*"))
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if available:
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options = "\n".join([""] + [repr(str(p.resolve())) for p in available])
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extra = f"\nYou have downloaded locally:{options}\n"
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else:
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extra = ""
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if verbose:
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error_message = (
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f"checkpoint_dir {str(checkpoint_dir.absolute())!r}{problem}."
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"\nFind download instructions at https://github.com/Lightning-AI/litgpt/blob/main/tutorials\n"
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f"{extra}\nSee all download options by running:\n litgpt download"
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)
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print(error_message, file=sys.stderr)
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if raise_error:
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raise FileNotFoundError(
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f"checkpoint_dir {str(checkpoint_dir.absolute())!r}{problem}."
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)
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else:
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raise SystemExit(1)
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class SavingProxyForStorage:
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def __init__(self, obj, saver, protocol_version=5):
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self.protocol_version = protocol_version
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self.saver = saver
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if not (isinstance(obj, torch.storage.TypedStorage) or torch.is_storage(obj)):
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raise TypeError(f"expected storage, not {type(obj)}")
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# this logic is taken from PyTorch 2.0+ torch/serialization.py
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if isinstance(obj, torch.storage.TypedStorage):
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# PT upstream wants to deprecate this eventually...
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storage = obj._untyped_storage
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storage_type_str = obj._pickle_storage_type()
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storage_type = getattr(torch, storage_type_str)
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storage_numel = obj._size()
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else:
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storage = obj
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storage_type = normalize_storage_type(type(obj))
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storage_numel = storage.nbytes()
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storage_key = saver._write_storage_and_return_key(storage)
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location = torch.serialization.location_tag(storage)
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self.storage_info = (
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"storage",
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storage_type,
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storage_key,
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location,
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storage_numel,
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)
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def __reduce_ex__(self, protocol_version):
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assert False, "this should be handled with out of band"
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class SavingProxyForTensor:
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def __init__(self, tensor, saver, protocol_version=5):
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self.protocol_version = protocol_version
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self.reduce_ret_fn, reduce_args = tensor.__reduce_ex__(protocol_version)
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if reduce_args[0] == torch._utils._rebuild_tensor_v2:
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# for Tensors with Python attributes
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(a0, a1, (storage, *a2_other), *other_reduce_args) = reduce_args
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assert isinstance(
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storage, torch.storage.TypedStorage
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), "Please check for updates"
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storage_proxy = SavingProxyForStorage(
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storage, saver, protocol_version=protocol_version
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)
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self.reduce_args = (a0, a1, (storage_proxy, *a2_other), *other_reduce_args)
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else:
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(storage, *other_reduce_args) = reduce_args
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assert isinstance(
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storage, torch.storage.TypedStorage
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), "Please check for updates"
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storage_proxy = SavingProxyForStorage(
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storage, saver, protocol_version=protocol_version
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)
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self.reduce_args = (storage_proxy, *other_reduce_args)
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def __reduce_ex__(self, protocol_version):
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if protocol_version != self.protocol_version:
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raise RuntimeError(
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f"Unexpected protocol version: expected {self.protocol_version}, got {protocol_version}"
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)
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return self.reduce_ret_fn, self.reduce_args
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class IncrementalPyTorchPickler(pickle.Pickler):
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def __init__(self, saver, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.storage_dtypes = {}
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self.saver = saver
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self.id_map = {}
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# this logic is taken from PyTorch 2.0+ torch/serialization.py
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def persistent_id(self, obj):
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# FIXME: the docs say that persistent_id should only return a string
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# but torch store returns tuples. This works only in the binary protocol
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# see
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# https://docs.python.org/2/library/pickle.html#pickling-and-unpickling-external-objects
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# https://github.com/python/cpython/blob/master/Lib/pickle.py#L527-L537
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if isinstance(obj, SavingProxyForStorage):
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return obj.storage_info
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if isinstance(obj, torch.storage.TypedStorage) or torch.is_storage(obj):
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if isinstance(obj, torch.storage.TypedStorage):
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# TODO: Once we decide to break serialization FC, this case
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# can be deleted
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storage = obj._untyped_storage
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storage_dtype = obj.dtype
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storage_type_str = obj._pickle_storage_type()
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storage_type = getattr(torch, storage_type_str)
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storage_numel = obj._size()
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else:
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storage = obj
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storage_dtype = torch.uint8
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storage_type = normalize_storage_type(type(obj))
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storage_numel = storage.nbytes()
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# If storage is allocated, ensure that any other saved storages
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# pointing to the same data all have the same dtype. If storage is
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# not allocated, don't perform this check
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if storage.data_ptr() != 0:
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if storage.data_ptr() in self.storage_dtypes:
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if storage_dtype != self.storage_dtypes[storage.data_ptr()]:
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raise RuntimeError(
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"Cannot save multiple tensors or storages that view the same data as different types"
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)
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else:
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self.storage_dtypes[storage.data_ptr()] = storage_dtype
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storage_key = self.id_map.get(storage._cdata)
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if storage_key is None:
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storage_key = self.saver._write_storage_and_return_key(storage)
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self.id_map[storage._cdata] = storage_key
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location = torch.serialization.location_tag(storage)
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return ("storage", storage_type, storage_key, location, storage_numel)
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return None
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class incremental_save:
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def __init__(self, name):
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self.name = name
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self.zipfile = torch._C.PyTorchFileWriter(str(name))
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self.has_saved = False
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self.next_key = 0
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def __enter__(self):
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return self
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def store_early(self, tensor):
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if isinstance(tensor, torch.Tensor):
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return SavingProxyForTensor(tensor, self)
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raise TypeError(f"can only store tensors early, not {type(tensor)}")
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def save(self, obj):
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if self.has_saved:
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raise RuntimeError("have already saved")
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# Write the pickle data for `obj`
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data_buf = BytesIO()
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pickler = IncrementalPyTorchPickler(self, data_buf, protocol=5)
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pickler.dump(obj)
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data_value = data_buf.getvalue()
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self.zipfile.write_record("data.pkl", data_value, len(data_value))
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self.has_saved = True
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def _write_storage_and_return_key(self, storage):
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if self.has_saved:
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raise RuntimeError("have already saved")
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key = self.next_key
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self.next_key += 1
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name = f"data/{key}"
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if storage.device.type != "cpu":
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storage = storage.cpu()
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num_bytes = storage.nbytes()
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self.zipfile.write_record(name, storage.data_ptr(), num_bytes)
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return key
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def __exit__(self, type, value, traceback):
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self.zipfile.write_end_of_file()
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T = TypeVar("T")
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def chunked_cross_entropy(
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logits: Union[torch.Tensor, List[torch.Tensor]],
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targets: torch.Tensor,
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chunk_size: int = 128,
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ignore_index: int = -100,
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) -> torch.Tensor:
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# with large max_sequence_lengths, the beginning of `backward` allocates a large memory chunk which can dominate
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# the memory usage in fine-tuning settings with low number of parameters.
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# as a workaround hack, the cross entropy computation is chunked to force it to deallocate on the go, reducing
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# the memory spike's magnitude
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# lm_head was chunked (we are fine-tuning)
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if isinstance(logits, list):
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# don't want to chunk cross entropy
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if chunk_size == 0:
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logits = torch.cat(logits, dim=1)
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logits = logits.reshape(-1, logits.size(-1))
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targets = targets.reshape(-1)
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return torch.nn.functional.cross_entropy(
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logits, targets, ignore_index=ignore_index
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)
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# chunk cross entropy
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logit_chunks = [
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logit_chunk.reshape(-1, logit_chunk.size(-1)) for logit_chunk in logits
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]
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target_chunks = [
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target_chunk.reshape(-1)
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for target_chunk in targets.split(logits[0].size(1), dim=1)
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]
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loss_chunks = [
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torch.nn.functional.cross_entropy(
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logit_chunk, target_chunk, ignore_index=ignore_index, reduction="none"
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)
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for logit_chunk, target_chunk in zip(logit_chunks, target_chunks)
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]
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non_masked_elems = (targets != ignore_index).sum()
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# See [non_masked_elems div note]
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return torch.cat(loss_chunks).sum() / non_masked_elems.maximum(
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torch.ones_like(non_masked_elems)
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)
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# no chunking at all
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logits = logits.reshape(-1, logits.size(-1))
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targets = targets.reshape(-1)
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if chunk_size == 0:
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return torch.nn.functional.cross_entropy(
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logits, targets, ignore_index=ignore_index
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)
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# lm_head wasn't chunked, chunk cross entropy
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logit_chunks = logits.split(chunk_size)
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target_chunks = targets.split(chunk_size)
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loss_chunks = [
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torch.nn.functional.cross_entropy(
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logit_chunk, target_chunk, ignore_index=ignore_index, reduction="none"
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)
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for logit_chunk, target_chunk in zip(logit_chunks, target_chunks)
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]
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non_masked_elems = (targets != ignore_index).sum()
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# [non_masked_elems div note]:
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# max(1, non_masked_elems) would be more ergonomic to avoid a division by zero. However that
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# results in a python int which is then passed back to torch division. By using the
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# `x.maximum(torch.ones_like(x))` pattern we avoid a cudaStreamSynchronize.
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return torch.cat(loss_chunks).sum() / non_masked_elems.maximum(
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torch.ones_like(non_masked_elems)
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)
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def map_old_state_dict_weights(state_dict: Dict, mapping: Mapping, prefix: str) -> Dict:
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for checkpoint_name, attribute_name in mapping.items():
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full_checkpoint_name = prefix + checkpoint_name
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if full_checkpoint_name in state_dict:
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full_attribute_name = prefix + attribute_name
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state_dict[full_attribute_name] = state_dict.pop(full_checkpoint_name)
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return state_dict
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def get_default_supported_precision(training: bool) -> str:
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"""Return default precision that is supported by the hardware: either `bf16` or `16`.
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Args:
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training: `-mixed` or `-true` version of the precision to use
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Returns:
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default precision that is suitable for the task and is supported by the hardware
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"""
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from lightning.fabric.accelerators import MPSAccelerator
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if MPSAccelerator.is_available() or (
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torch.cuda.is_available() and not torch.cuda.is_bf16_supported()
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):
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return "16-mixed" if training else "16-true"
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return "bf16-mixed" if training else "bf16-true"
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def load_checkpoint(
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fabric: L.Fabric, model: nn.Module, checkpoint_path: Path, strict: bool = True
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) -> None:
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if isinstance(fabric.strategy, FSDPStrategy):
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fabric.load_raw(checkpoint_path, model, strict=strict)
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else:
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state_dict = lazy_load(checkpoint_path)
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state_dict = state_dict.get("model", state_dict)
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model.load_state_dict(state_dict, strict=strict)
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def flops_per_param(
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max_seq_length: int, n_layer: int, n_embd: int, n_params: int
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) -> int:
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flops_per_token = (
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2 * n_params
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) # each parameter is used for a MAC (2 FLOPS) per network operation
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# this assumes that all samples have a fixed length equal to the block size
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# which is most likely false during finetuning
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flops_per_seq = flops_per_token * max_seq_length
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attn_flops_per_seq = n_layer * 2 * 2 * (n_embd * (max_seq_length**2))
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return flops_per_seq + attn_flops_per_seq
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def estimate_flops(model: "GPT", training: bool) -> int:
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"""Measures estimated FLOPs for MFU.
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Refs:
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* https://ar5iv.labs.arxiv.org/html/2205.05198#A1
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* https://ar5iv.labs.arxiv.org/html/2204.02311#A2
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"""
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# using all parameters for this is a naive over estimation because not all model parameters actually contribute to
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# this FLOP computation (e.g. embedding, norm). For this reason, the result will be higher by a fixed percentage
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# (~10%) compared to the measured FLOPs, making those lower but more realistic.
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# For a proper estimate, this needs a more fine-grained calculation as in Appendix A of the paper.
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n_trainable_params = num_parameters(model, requires_grad=True)
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trainable_flops = flops_per_param(
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model.max_seq_length,
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model.config.n_layer,
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model.config.n_embd,
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n_trainable_params,
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)
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# forward + backward + gradients (assumes no gradient accumulation)
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ops_per_step = 3 if training else 1
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n_frozen_params = num_parameters(model, requires_grad=False)
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frozen_flops = flops_per_param(
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model.max_seq_length, model.config.n_layer, model.config.n_embd, n_frozen_params
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)
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# forward + backward
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frozen_ops_per_step = 2 if training else 1
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return ops_per_step * trainable_flops + frozen_ops_per_step * frozen_flops
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class CycleIterator:
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"""An iterator that cycles through an iterable indefinitely.
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Example:
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>>> iterator = CycleIterator([1, 2, 3])
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>>> [next(iterator) for _ in range(5)]
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[1, 2, 3, 1, 2]
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Note:
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Unlike ``itertools.cycle``, this iterator does not cache the values of the iterable.
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"""
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def __init__(self, iterable: Iterable) -> None:
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self.iterable = iterable
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self.epoch = 0
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self._iterator = None
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def __next__(self) -> Any:
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if self._iterator is None:
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self._iterator = iter(self.iterable)
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try:
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return next(self._iterator)
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except StopIteration:
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self._iterator = iter(self.iterable)
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self.epoch += 1
|
|
return next(self._iterator)
|
|
|
|
def __iter__(self) -> Self:
|
|
return self
|
|
|
|
|
|
def copy_config_files(source_dir: Path, out_dir: Path) -> None:
|
|
"""Copies the specified configuration and tokenizer files into the output directory."""
|
|
|
|
config_files = ["config.json", "generation_config.json", "model_config.yaml"]
|
|
tokenizer_files = ["tokenizer.json", "tokenizer.model", "tokenizer_config.json"]
|
|
|
|
for file_name in config_files + tokenizer_files:
|
|
src_path = source_dir / file_name
|
|
if src_path.exists():
|
|
shutil.copy(src_path, out_dir)
|
|
|
|
|
|
def CLI(*args: Any, **kwargs: Any) -> Any:
|
|
from jsonargparse import CLI, set_config_read_mode, set_docstring_parse_options
|
|
|
|
set_docstring_parse_options(attribute_docstrings=True)
|
|
set_config_read_mode(urls_enabled=True)
|
|
|
|
return CLI(*args, **kwargs)
|
|
|
|
|
|
def capture_hparams() -> Dict[str, Any]:
|
|
"""Captures the local variables ('hyperparameters') from where this function gets called."""
|
|
caller_frame = inspect.currentframe().f_back
|
|
locals_of_caller = caller_frame.f_locals
|
|
hparams = {}
|
|
for name, value in locals_of_caller.items():
|
|
if value is None or isinstance(value, (int, float, str, bool, Path)):
|
|
hparams[name] = value
|
|
elif is_dataclass(value):
|
|
hparams[name] = asdict(value)
|
|
else:
|
|
hparams[name] = str(value)
|
|
return hparams
|
|
|
|
|
|
def save_hyperparameters(function: callable, checkpoint_dir: Path) -> None:
|
|
"""Captures the CLI parameters passed to `function` without running `function` and saves them to the checkpoint."""
|
|
from jsonargparse import capture_parser
|
|
|
|
# TODO: Make this more robust
|
|
# This hack strips away the subcommands from the top-level CLI
|
|
# to parse the file as if it was called as a script
|
|
known_commands = [
|
|
("finetune_full",), # For subcommands, use `("finetune", "full")` etc
|
|
("finetune_lora",),
|
|
("finetune_adapter",),
|
|
("finetune_adapter_v2",),
|
|
("finetune",),
|
|
("pretrain",),
|
|
]
|
|
for known_command in known_commands:
|
|
unwanted = slice(1, 1 + len(known_command))
|
|
if tuple(sys.argv[unwanted]) == known_command:
|
|
sys.argv[unwanted] = []
|
|
|
|
parser = capture_parser(lambda: CLI(function))
|
|
config = parser.parse_args()
|
|
parser.save(config, checkpoint_dir / "hyperparameters.yaml", overwrite=True)
|
|
|
|
|
|
def save_config(config: "Config", checkpoint_dir: Path) -> None:
|
|
config_dict = asdict(config)
|
|
with open(checkpoint_dir / "model_config.yaml", "w", encoding="utf-8") as fp:
|
|
yaml.dump(config_dict, fp)
|
|
|
|
|
|
def parse_devices(devices: Union[str, int]) -> int:
|
|
if devices in (-1, "auto"):
|
|
return torch.cuda.device_count() or 1
|
|
if isinstance(devices, int) and devices > 0:
|
|
return devices
|
|
raise ValueError(f"Devices must be 'auto' or a positive integer, got: {devices!r}")
|
|
|
|
|
|
def choose_logger(
|
|
logger_name: Literal["csv", "tensorboard", "wandb"],
|
|
out_dir: Path,
|
|
name: str,
|
|
log_interval: int = 1,
|
|
resume: Optional[bool] = None,
|
|
**kwargs: Any,
|
|
):
|
|
if logger_name == "csv":
|
|
return CSVLogger(
|
|
root_dir=(out_dir / "logs"),
|
|
name="csv",
|
|
flush_logs_every_n_steps=log_interval,
|
|
**kwargs,
|
|
)
|
|
if logger_name == "tensorboard":
|
|
return TensorBoardLogger(
|
|
root_dir=(out_dir / "logs"), name="tensorboard", **kwargs
|
|
)
|
|
if logger_name == "wandb":
|
|
return WandbLogger(project=name, resume=resume, **kwargs)
|
|
raise ValueError(
|
|
f"`--logger_name={logger_name}` is not a valid option. Choose from 'csv', 'tensorboard', 'wandb'."
|
|
)
|
|
|
|
|
|
def get_argument_names(cls):
|
|
sig = inspect.signature(cls.__init__)
|
|
return {
|
|
name
|
|
for name, param in sig.parameters.items()
|
|
if param.kind
|
|
in [inspect.Parameter.POSITIONAL_OR_KEYWORD, inspect.Parameter.KEYWORD_ONLY]
|
|
}
|
|
|
|
|
|
def instantiate_bnb_optimizer(optimizer, model_parameters):
|
|
if (isinstance(optimizer, str) and "AdamW" not in optimizer) or (
|
|
isinstance(optimizer, dict) and "AdamW" not in optimizer.get("class_path", "")
|
|
):
|
|
raise ValueError(
|
|
"The chosen quantization format only supports the AdamW optimizer."
|
|
)
|
|
|
|
import bitsandbytes as bnb
|
|
|
|
if isinstance(optimizer, str):
|
|
optimizer = bnb.optim.PagedAdamW(model_parameters)
|
|
else:
|
|
optim_args = get_argument_names(bnb.optim.PagedAdamW)
|
|
allowed_kwargs = {
|
|
key: optimizer["init_args"][key]
|
|
for key in optim_args & optimizer["init_args"].keys()
|
|
}
|
|
optimizer = bnb.optim.PagedAdamW(model_parameters, **allowed_kwargs)
|
|
return optimizer
|
|
|
|
|
|
def instantiate_torch_optimizer(optimizer, model_parameters, **kwargs):
|
|
if isinstance(optimizer, str):
|
|
optimizer_cls = getattr(torch.optim, optimizer)
|
|
optimizer = optimizer_cls(model_parameters, **kwargs)
|
|
else:
|
|
optimizer = dict(optimizer) # copy
|
|
optimizer["init_args"].update(kwargs)
|
|
optimizer = instantiate_class(model_parameters, optimizer)
|
|
return optimizer
|
|
|
|
|
|
def extend_checkpoint_dir(checkpoint_dir: Path) -> Path:
|
|
new_checkpoint_dir = "checkpoints" / checkpoint_dir
|
|
should_return_new_dir = (
|
|
not checkpoint_dir.is_dir()
|
|
and checkpoint_dir.parts[0] != "checkpoints"
|
|
and not checkpoint_dir.is_absolute()
|
|
and new_checkpoint_dir.exists()
|
|
)
|
|
return new_checkpoint_dir if should_return_new_dir else checkpoint_dir
|