vbatts/llama.cpp
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gguf-dump: refactor GGUFReader for clarity

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brian khuu 2024-06-21 20:26:09 +10:00 • committed by Brian
parent 0fee5b6d56
commit c0e6537508
1 changed files with 23 additions and 4 deletions
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27
gguf-py/gguf/gguf_reader.py
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@ -89,9 +89,13 @@ class GGUFReader:
def __init__(self, path: os.PathLike[str] | str, mode: Literal['r'] | Literal['r+'] | Literal['c'] = 'r'):
self.data = np.memmap(path, mode = mode)
offs = 0
# Check for GGUF magic
if self._get(offs, np.uint32, override_order = '<')[0] != GGUF_MAGIC:
raise ValueError('GGUF magic invalid')
offs += 4
# Check GGUF version
temp_version = self._get(offs, np.uint32)
if temp_version[0] & 65535 == 0:
# If we get 0 here that means it's (probably) a GGUF file created for
@ -104,12 +108,16 @@ class GGUFReader:
self.fields: OrderedDict[str, ReaderField] = OrderedDict()
self.tensors: list[ReaderTensor] = []
offs += self._push_field(ReaderField(offs, 'GGUF.version', [temp_version], [0], [GGUFValueType.UINT32]))
# Check tensor count and kv count
temp_counts = self._get(offs, np.uint64, 2)
offs += self._push_field(ReaderField(offs, 'GGUF.tensor_count', [temp_counts[:1]], [0], [GGUFValueType.UINT64]))
offs += self._push_field(ReaderField(offs, 'GGUF.kv_count', [temp_counts[1:]], [0], [GGUFValueType.UINT64]))
tensor_count, kv_count = temp_counts
offs = self._build_fields(offs, kv_count)
offs, tensors_fields = self._build_tensors_fields(offs, tensor_count)
# Build Tensor Info Fields
offs, tensors_fields = self._build_tensors_info_fields(offs, tensor_count)
new_align = self.fields.get('general.alignment')
if new_align is not None:
if new_align.types != [GGUFValueType.UINT32]:
@ -195,18 +203,29 @@ class GGUFReader:
# We can't deal with this one.
raise ValueError('Unknown/unhandled field type {gtype}')
def _get_tensor(self, orig_offs: int) -> ReaderField:
def _get_tensor_info_field(self, orig_offs: int) -> ReaderField:
offs = orig_offs
# Tensor Info Name
name_len, name_data = self._get_str(offs)
offs += int(name_len.nbytes + name_data.nbytes)
# Tensor Info Dimensions Count
n_dims = self._get(offs, np.uint32)
offs += int(n_dims.nbytes)
# Tensor Info Dimension Array
dims = self._get(offs, np.uint64, n_dims[0])
offs += int(dims.nbytes)
# Tensor Info Tensor Type
raw_dtype = self._get(offs, np.uint32)
offs += int(raw_dtype.nbytes)
# Tensor Info Offset
offset_tensor = self._get(offs, np.uint64)
offs += int(offset_tensor.nbytes)
return ReaderField(
orig_offs,
str(bytes(name_data), encoding = 'utf-8'),
@ -235,10 +254,10 @@ class GGUFReader:
offs += field_size
return offs
def _build_tensors_fields(self, offs: int, count: int) -> tuple[int, list[ReaderField]]:
def _build_tensors_info_fields(self, offs: int, count: int) -> tuple[int, list[ReaderField]]:
tensor_fields = []
for _ in range(count):
field = self._get_tensor(offs)
field = self._get_tensor_info_field(offs)
offs += sum(int(part.nbytes) for part in field.parts)
tensor_fields.append(field)
return offs, tensor_fields