vbatts/llama.cpp
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convert-hf : support q8_0 conversion

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Francis Couture-Harpin 2024-05-10 14:47:28 -04:00
parent 5a419926b0
commit d7e199e444
5 changed files with 157 additions and 57 deletions
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66
convert-hf-to-gguf.py
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@ -240,23 +240,6 @@ class Model:
return False
def write_tensors(self):
# same as ggml_compute_fp32_to_bf16 in ggml-impl.h
def np_fp32_to_bf16(n: np.ndarray):
# force nan to quiet
n = np.where((n & 0x7fffffff) > 0x7f800000, (n & 0xffff0000) | (64 << 16), n)
# flush subnormals to zero
n = np.where((n & 0x7f800000) == 0, n & 0x80000000, n)
# round to nearest even
n = (n + (0x7fff + ((n >> 16) & 1))) >> 16
return n.astype(np.int16)
# Doing this row-wise is much, much faster than element-wise, hence the signature
v_fp32_to_bf16 = np.vectorize(np_fp32_to_bf16, otypes=[np.int16], signature="(n)->(n)")
if self.lazy:
# TODO: find a way to implicitly wrap np.vectorize functions
# NOTE: the type is changed to reflect otypes passed to np.vectorize above
v_fp32_to_bf16 = gguf.LazyNumpyTensor._wrap_fn(v_fp32_to_bf16, meta_noop=np.int16)
max_name_len = max(len(s) for _, s in self.tensor_map.mapping.values()) + len(".weight,")
for name, data_torch in self.get_tensors():
@ -309,27 +292,31 @@ class Model:
))
if self.ftype != gguf.LlamaFileType.ALL_F32 and extra_f16 and not extra_f32:
if self.ftype == gguf.LlamaFileType.MOSTLY_F16:
if self.ftype == gguf.LlamaFileType.MOSTLY_BF16:
data = gguf.quantize_bf16(data)
assert data.dtype == np.int16
data_qtype = gguf.GGMLQuantizationType.BF16
elif self.ftype == gguf.LlamaFileType.MOSTLY_Q8_0 and gguf.can_quantize_to_q8_0(data):
data = gguf.quantize_q8_0(data)
assert data.dtype == np.uint8
data_qtype = gguf.GGMLQuantizationType.Q8_0
else: # default to float16 for quantized tensors
if data_dtype != np.float16:
data = data.astype(np.float16)
data_qtype = gguf.GGMLQuantizationType.F16
elif self.ftype == gguf.LlamaFileType.MOSTLY_BF16:
if data_dtype != np.float32:
data = data.astype(np.float32)
data = v_fp32_to_bf16(data.view(np.int32))
assert data.dtype == np.int16
data_qtype = gguf.GGMLQuantizationType.BF16
else: # by default, convert to float32
if data_qtype is None: # by default, convert to float32
if data_dtype != np.float32:
data = data.astype(np.float32)
data_qtype = gguf.GGMLQuantizationType.F32
assert data_qtype is not None
block_size, type_size = gguf.GGML_QUANT_SIZES[data_qtype]
# reverse shape to make it similar to the internal ggml dimension order
shape_str = f"{{{', '.join(str(n) for n in reversed(data.shape))}}}"
shape_str = f"""{{{', '.join(str(n) for n in reversed(
(*data.shape[:-1], data.shape[-1] * data.dtype.itemsize // type_size * block_size))
)}}}"""
# n_dims is implicit in the shape
logger.info(f"{f'%-{max_name_len}s' % f'{new_name},'} {old_dtype} --> {data_qtype.name}, shape = {shape_str}")
@ -2415,25 +2402,15 @@ class LazyTorchTensor(gguf.LazyBase):
def numpy(self) -> gguf.LazyNumpyTensor:
dtype = self._dtype_map[self.dtype]
return gguf.LazyNumpyTensor(
meta=np.lib.stride_tricks.as_strided(np.zeros(1, dtype), self.shape, (0 for _ in self.shape)),
meta=gguf.LazyNumpyTensor.meta_with_dtype_and_shape(dtype, self.shape),
lazy=self._lazy,
args=(self,),
func=(lambda s: s[0].numpy())
)
@classmethod
def eager_to_meta(cls, t: Tensor) -> Tensor:
if t.is_meta:
return t
return t.detach().to("meta")
@classmethod
def meta_with_dtype(cls, m: Tensor, dtype: torch.dtype) -> Tensor:
m = m.detach()
if not m.is_meta:
m = m.to("meta")
m.dtype = dtype
return m
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 __torch_function__(cls, func, types, args=(), kwargs=None):
@ -2464,8 +2441,8 @@ def parse_args() -> argparse.Namespace:
help="path to write to; default: based on input. {ftype} will be replaced by the outtype.",
)
parser.add_argument(
"--outtype", type=str, choices=["f32", "f16", "bf16", "auto"], default="f16",
help="output format - use f32 for float32, f16 for float16, bf16 for bfloat16, auto for the highest-fidelity 16-bit float type depending on the first loaded tensor type",
"--outtype", type=str, choices=["f32", "f16", "bf16", "q8_0", "auto"], default="f16",
help="output format - use f32 for float32, f16 for float16, bf16 for bfloat16, q8_0 for Q8_0, auto for the highest-fidelity 16-bit float type depending on the first loaded tensor type",
)
parser.add_argument(
"--bigendian", action="store_true",
@ -2523,6 +2500,7 @@ def main() -> None:
"f32": gguf.LlamaFileType.ALL_F32,
"f16": gguf.LlamaFileType.MOSTLY_F16,
"bf16": gguf.LlamaFileType.MOSTLY_BF16,
"q8_0": gguf.LlamaFileType.MOSTLY_Q8_0,
"auto": gguf.LlamaFileType.GUESSED,
}