mirror of
https://github.com/ggerganov/llama.cpp.git
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317 lines
12 KiB
Python
317 lines
12 KiB
Python
#
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# GGUF file reading/modification support. For API usage information,
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# please see the files scripts/ for some fairly simple examples.
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#
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from __future__ import annotations
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import logging
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import os
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from collections import OrderedDict
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from typing import Any, Literal, NamedTuple, TypeVar, Union
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import numpy as np
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import numpy.typing as npt
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from .quants import quant_shape_to_byte_shape
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if __name__ == "__main__":
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import sys
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from pathlib import Path
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# Allow running file in package as a script.
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sys.path.insert(0, str(Path(__file__).parent.parent))
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from gguf.constants import (
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GGML_QUANT_SIZES,
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GGUF_DEFAULT_ALIGNMENT,
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GGUF_MAGIC,
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GGUF_VERSION,
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GGMLQuantizationType,
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GGUFValueType,
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)
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logger = logging.getLogger(__name__)
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READER_SUPPORTED_VERSIONS = [2, GGUF_VERSION]
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class ReaderField(NamedTuple):
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# Offset to start of this field.
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offset: int
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# Name of the field (not necessarily from file data).
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name: str
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# Data parts. Some types have multiple components, such as strings
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# that consist of a length followed by the string data.
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parts: list[npt.NDArray[Any]] = []
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# Indexes into parts that we can call the actual data. For example
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# an array of strings will be populated with indexes to the actual
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# string data.
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data: list[int] = [-1]
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types: list[GGUFValueType] = []
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class ReaderTensor(NamedTuple):
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name: str
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tensor_type: GGMLQuantizationType
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shape: npt.NDArray[np.uint32]
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n_elements: int
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n_bytes: int
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data_offset: int
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data: npt.NDArray[Any]
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field: ReaderField
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class GGUFReader:
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# I - same as host, S - swapped
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byte_order: Literal['I', 'S'] = 'I'
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alignment: int = GGUF_DEFAULT_ALIGNMENT
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data_offset: int
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# Note: Internal helper, API may change.
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gguf_scalar_to_np: dict[GGUFValueType, type[np.generic]] = {
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GGUFValueType.UINT8: np.uint8,
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GGUFValueType.INT8: np.int8,
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GGUFValueType.UINT16: np.uint16,
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GGUFValueType.INT16: np.int16,
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GGUFValueType.UINT32: np.uint32,
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GGUFValueType.INT32: np.int32,
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GGUFValueType.FLOAT32: np.float32,
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GGUFValueType.UINT64: np.uint64,
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GGUFValueType.INT64: np.int64,
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GGUFValueType.FLOAT64: np.float64,
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GGUFValueType.BOOL: np.bool_,
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}
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def __init__(self, path: os.PathLike[str] | str, mode: Literal['r', 'r+', 'c'] = 'r'):
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self.data = np.memmap(path, mode = mode)
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offs = 0
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# Check for GGUF magic
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if self._get(offs, np.uint32, override_order = '<')[0] != GGUF_MAGIC:
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raise ValueError('GGUF magic invalid')
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offs += 4
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# Check GGUF version
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temp_version = self._get(offs, np.uint32)
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if temp_version[0] & 65535 == 0:
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# If we get 0 here that means it's (probably) a GGUF file created for
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# the opposite byte order of the machine this script is running on.
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self.byte_order = 'S'
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temp_version = temp_version.newbyteorder(self.byte_order)
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version = temp_version[0]
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if version not in READER_SUPPORTED_VERSIONS:
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raise ValueError(f'Sorry, file appears to be version {version} which we cannot handle')
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self.fields: OrderedDict[str, ReaderField] = OrderedDict()
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self.tensors: list[ReaderTensor] = []
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offs += self._push_field(ReaderField(offs, 'GGUF.version', [temp_version], [0], [GGUFValueType.UINT32]))
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# Check tensor count and kv count
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temp_counts = self._get(offs, np.uint64, 2)
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offs += self._push_field(ReaderField(offs, 'GGUF.tensor_count', [temp_counts[:1]], [0], [GGUFValueType.UINT64]))
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offs += self._push_field(ReaderField(offs, 'GGUF.kv_count', [temp_counts[1:]], [0], [GGUFValueType.UINT64]))
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tensor_count, kv_count = temp_counts
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offs = self._build_fields(offs, kv_count)
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# Build Tensor Info Fields
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offs, tensors_fields = self._build_tensor_info(offs, tensor_count)
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new_align = self.fields.get('general.alignment')
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if new_align is not None:
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if new_align.types != [GGUFValueType.UINT32]:
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raise ValueError('Bad type for general.alignment field')
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self.alignment = new_align.parts[-1][0]
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padding = offs % self.alignment
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if padding != 0:
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offs += self.alignment - padding
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self.data_offset = offs
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self._build_tensors(offs, tensors_fields)
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_DT = TypeVar('_DT', bound = npt.DTypeLike)
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# Fetch a key/value metadata field by key.
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def get_field(self, key: str) -> Union[ReaderField, None]:
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return self.fields.get(key, None)
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# Fetch a tensor from the list by index.
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def get_tensor(self, idx: int) -> ReaderTensor:
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return self.tensors[idx]
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def _get(
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self, offset: int, dtype: npt.DTypeLike, count: int = 1, override_order: None | Literal['I', 'S', '<'] = None,
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) -> npt.NDArray[Any]:
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count = int(count)
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itemsize = int(np.empty([], dtype = dtype).itemsize)
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end_offs = offset + itemsize * count
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arr = self.data[offset:end_offs].view(dtype=dtype)[:count]
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if override_order is None:
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return arr
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return arr.view(arr.dtype.newbyteorder(override_order))
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def _push_field(self, field: ReaderField, skip_sum: bool = False) -> int:
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if field.name in self.fields:
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# TODO: add option to generate error on duplicate keys
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# raise KeyError(f'Duplicate {field.name} already in list at offset {field.offset}')
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logger.warning(f'Duplicate key {field.name} at offset {field.offset}')
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self.fields[field.name + '_{}'.format(field.offset)] = field
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else:
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self.fields[field.name] = field
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return 0 if skip_sum else sum(int(part.nbytes) for part in field.parts)
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def _get_str(self, offset: int) -> tuple[npt.NDArray[np.uint64], npt.NDArray[np.uint8]]:
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slen = self._get(offset, np.uint64)
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return slen, self._get(offset + 8, np.uint8, slen[0])
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def _get_field_parts(
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self, orig_offs: int, raw_type: int,
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) -> tuple[int, list[npt.NDArray[Any]], list[int], list[GGUFValueType]]:
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offs = orig_offs
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types: list[GGUFValueType] = []
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gtype = GGUFValueType(raw_type)
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types.append(gtype)
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# Handle strings.
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if gtype == GGUFValueType.STRING:
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sparts: list[npt.NDArray[Any]] = list(self._get_str(offs))
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size = sum(int(part.nbytes) for part in sparts)
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return size, sparts, [1], types
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# Check if it's a simple scalar type.
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nptype = self.gguf_scalar_to_np.get(gtype)
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if nptype is not None:
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val = self._get(offs, nptype)
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return int(val.nbytes), [val], [0], types
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# Handle arrays.
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if gtype == GGUFValueType.ARRAY:
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raw_itype = self._get(offs, np.uint32)
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offs += int(raw_itype.nbytes)
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alen = self._get(offs, np.uint64)
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offs += int(alen.nbytes)
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aparts: list[npt.NDArray[Any]] = [raw_itype, alen]
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data_idxs: list[int] = []
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for idx in range(alen[0]):
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curr_size, curr_parts, curr_idxs, curr_types = self._get_field_parts(offs, raw_itype[0])
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if idx == 0:
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types += curr_types
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idxs_offs = len(aparts)
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aparts += curr_parts
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data_idxs += (idx + idxs_offs for idx in curr_idxs)
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offs += curr_size
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return offs - orig_offs, aparts, data_idxs, types
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# We can't deal with this one.
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raise ValueError('Unknown/unhandled field type {gtype}')
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def _get_tensor_info_field(self, orig_offs: int) -> ReaderField:
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offs = orig_offs
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# Get Tensor Name
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name_len, name_data = self._get_str(offs)
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offs += int(name_len.nbytes + name_data.nbytes)
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# Get Tensor Dimensions Count
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n_dims = self._get(offs, np.uint32)
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offs += int(n_dims.nbytes)
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# Get Tensor Dimension Array
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dims = self._get(offs, np.uint64, n_dims[0])
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offs += int(dims.nbytes)
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# Get Tensor Encoding Scheme Type
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raw_dtype = self._get(offs, np.uint32)
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offs += int(raw_dtype.nbytes)
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# Get Tensor Offset
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offset_tensor = self._get(offs, np.uint64)
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offs += int(offset_tensor.nbytes)
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return ReaderField(
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orig_offs,
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str(bytes(name_data), encoding = 'utf-8'),
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[name_len, name_data, n_dims, dims, raw_dtype, offset_tensor],
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[1, 3, 4, 5],
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)
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def _build_fields(self, offs: int, count: int) -> int:
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for _ in range(count):
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orig_offs = offs
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kv_klen, kv_kdata = self._get_str(offs)
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offs += int(kv_klen.nbytes + kv_kdata.nbytes)
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raw_kv_type = self._get(offs, np.uint32)
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offs += int(raw_kv_type.nbytes)
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parts: list[npt.NDArray[Any]] = [kv_klen, kv_kdata, raw_kv_type]
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idxs_offs = len(parts)
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field_size, field_parts, field_idxs, field_types = self._get_field_parts(offs, raw_kv_type[0])
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parts += field_parts
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self._push_field(ReaderField(
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orig_offs,
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str(bytes(kv_kdata), encoding = 'utf-8'),
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parts,
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[idx + idxs_offs for idx in field_idxs],
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field_types,
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), skip_sum = True)
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offs += field_size
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return offs
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def _build_tensor_info(self, offs: int, count: int) -> tuple[int, list[ReaderField]]:
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tensor_fields = []
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for _ in range(count):
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field = self._get_tensor_info_field(offs)
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offs += sum(int(part.nbytes) for part in field.parts)
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tensor_fields.append(field)
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return offs, tensor_fields
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def _build_tensors(self, start_offs: int, fields: list[ReaderField]) -> None:
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tensors = []
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tensor_names = set() # keep track of name to prevent duplicated tensors
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for field in fields:
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_name_len, name_data, _n_dims, dims, raw_dtype, offset_tensor = field.parts
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# check if there's any tensor having same name already in the list
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tensor_name = str(bytes(name_data), encoding = 'utf-8')
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if tensor_name in tensor_names:
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raise ValueError(f'Found duplicated tensor with name {tensor_name}')
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tensor_names.add(tensor_name)
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ggml_type = GGMLQuantizationType(raw_dtype[0])
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n_elems = int(np.prod(dims))
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np_dims = tuple(reversed(dims.tolist()))
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block_size, type_size = GGML_QUANT_SIZES[ggml_type]
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n_bytes = n_elems * type_size // block_size
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data_offs = int(start_offs + offset_tensor[0])
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item_type: npt.DTypeLike
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if ggml_type == GGMLQuantizationType.F16:
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item_count = n_elems
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item_type = np.float16
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elif ggml_type == GGMLQuantizationType.F32:
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item_count = n_elems
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item_type = np.float32
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elif ggml_type == GGMLQuantizationType.F64:
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item_count = n_elems
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item_type = np.float64
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elif ggml_type == GGMLQuantizationType.I8:
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item_count = n_elems
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item_type = np.int8
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elif ggml_type == GGMLQuantizationType.I16:
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item_count = n_elems
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item_type = np.int16
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elif ggml_type == GGMLQuantizationType.I32:
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item_count = n_elems
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item_type = np.int32
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elif ggml_type == GGMLQuantizationType.I64:
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item_count = n_elems
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item_type = np.int64
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else:
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item_count = n_bytes
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item_type = np.uint8
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np_dims = quant_shape_to_byte_shape(np_dims, ggml_type)
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tensors.append(ReaderTensor(
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name = tensor_name,
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tensor_type = ggml_type,
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shape = dims,
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n_elements = n_elems,
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n_bytes = n_bytes,
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data_offset = data_offs,
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data = self._get(data_offs, item_type, item_count).reshape(np_dims),
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field = field,
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))
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self.tensors = tensors
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