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convert_hf : faster lazy safetensors

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This commit is contained in:
Francis Couture-Harpin 2024-07-14 18:27:36 -04:00
parent aaab2419ea
commit 7cda4dd7e9
2 changed files with 44 additions and 11 deletions
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37
convert_hf_to_gguf.py
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@ -148,7 +148,14 @@ class Model:
tensor_names_from_parts.update(model_part.keys())
for name in model_part.keys():
data = model_part.get_tensor(name) if self.is_safetensors else model_part[name]
if self.is_safetensors:
if self.lazy:
data = model_part.get_slice(name)
data = LazyTorchTensor.from_safetensors_slice(data)
else:
data = model_part.get_tensor(name)
else:
data = model_part[name]
if self.lazy:
data = LazyTorchTensor.from_eager(data)
yield name, data
@ -3435,6 +3442,27 @@ class LazyTorchTensor(gguf.LazyBase):
torch.float32: np.float32,
}
# used for safetensors slices
# ref: https://github.com/huggingface/safetensors/blob/079781fd0dc455ba0fe851e2b4507c33d0c0d407/bindings/python/src/lib.rs#L1046
# TODO: uncomment U64, U32, and U16, ref: https://github.com/pytorch/pytorch/issues/58734
_dtype_str_map: dict[str, torch.dtype] = {
"F64": torch.float64,
"F32": torch.float32,
"BF16": torch.bfloat16,
"F16": torch.float16,
# "U64": torch.uint64,
"I64": torch.int64,
# "U32": torch.uint32,
"I32": torch.int32,
# "U16": torch.uint16,
"I16": torch.int16,
"U8": torch.uint8,
"I8": torch.int8,
"BOOL": torch.bool,
"F8_E4M3": torch.float8_e4m3fn,
"F8_E5M2": torch.float8_e5m2,
}
def numpy(self) -> gguf.LazyNumpyTensor:
dtype = self._dtype_map[self.dtype]
return gguf.LazyNumpyTensor(
@ -3448,6 +3476,13 @@ class LazyTorchTensor(gguf.LazyBase):
def meta_with_dtype_and_shape(cls, dtype: torch.dtype, shape: torch.Size) -> Tensor:
return torch.empty(size=shape, dtype=dtype, device="meta")
@classmethod
def from_safetensors_slice(cls, st_slice: Any) -> Tensor:
dtype = cls._dtype_str_map[st_slice.get_dtype()]
shape = st_slice.get_shape()
lazy = cls(meta=cls.meta_with_dtype_and_shape(dtype, shape), args=(st_slice,), func=lambda s: s[0][:])
return cast(torch.Tensor, lazy)
@classmethod
def __torch_function__(cls, func, types, args=(), kwargs=None):
del types # unused

8
gguf-py/gguf/tensor_mapping.py
View File

@ -602,13 +602,11 @@ class TensorNameMap:
for tensor, keys in self.block_mappings_cfg.items():
if tensor not in MODEL_TENSORS[arch]:
continue
# TODO: make this configurable
n_experts = 160
for xid in range(n_experts):
tensor_name = TENSOR_NAMES[tensor].format(bid = bid, xid = xid)
tensor_name = TENSOR_NAMES[tensor].format(bid = bid)
self.mapping[tensor_name] = (tensor, tensor_name)
for key in keys:
key = key.format(bid = bid, xid = xid)
key = key.format(bid = bid)
self.mapping[key] = (tensor, tensor_name)
def get_type_and_name(self, key: str, try_suffixes: Sequence[str] = ()) -> tuple[MODEL_TENSOR, str] | None: