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convert.py: Fix loading safetensors and ggml format on Windows #991

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merged 1 commit into from
Apr 15, 2023
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convert.py: Fix loading safetensors and ggml format on Windows #991

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6 changes: 4 additions & 2 deletions convert.py
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Original file line number Diff line number Diff line change
Expand Up @@ -735,7 +735,7 @@ def lazy_load_safetensors_file(fp: IO[bytes], path: Path) -> ModelPlus:
header: Dict[str, Dict[str, Any]] = json.loads(fp.read(header_size))
# Use mmap for the actual data to avoid race conditions with the file offset.
mapped = memoryview(mmap.mmap(fp.fileno(), 0, access=mmap.ACCESS_READ))
byte_buf = mapped[fp.tell():]
byte_buf = mapped[8 + header_size:]

def convert(info: Dict[str, Any]) -> LazyTensor:
data_type = SAFETENSORS_DATA_TYPES[info['dtype']]
Expand All @@ -761,7 +761,7 @@ def must_read(fp: IO[bytes], length: int) -> bytes:
return ret


def lazy_load_ggml_file(fp: IO[bytes], path: Path) -> ModelPlus:
def lazy_load_ggml_file(fp: io.BufferedReader, path: Path) -> ModelPlus:
magic = must_read(fp, 4)[::-1]
if magic in (b'ggmf', b'ggjt'):
version, = struct.unpack("i", must_read(fp, 4))
Expand Down Expand Up @@ -795,7 +795,9 @@ def lazy_load_ggml_file(fp: IO[bytes], path: Path) -> ModelPlus:

model: LazyModel = {}
# Use mmap for the actual data to avoid race conditions with the file offset.
off = fp.raw.tell()
mapped = memoryview(mmap.mmap(fp.fileno(), 0, access=mmap.ACCESS_READ))
fp.raw.seek(off) # needed on Windows

def read_tensor() -> None: # this is a function so that variables captured in `load` don't change
shape_len, name_len, ftype = struct.unpack("iii", must_read(fp, 12))
Expand Down