py: add_array() will not add to kv store if value is an empty array (#8774)

* gguf_writer.py: add_array() should not add to kv store if empty

* Apply suggestions from code review

I was wondering if there was a specific reason for `if val` but good to hear we can safely use `len(val == 0`

Co-authored-by: compilade <git@compilade.net>

---------

Co-authored-by: compilade <git@compilade.net>
This commit is contained in:
Brian 2024-07-31 00:57:03 +10:00 committed by GitHub
parent 7c27a19b2e
commit 7e72aa74fd
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@ -312,6 +312,8 @@ class GGUFWriter:
self.add_key_value(key, val, GGUFValueType.STRING)
def add_array(self, key: str, val: Sequence[Any]) -> None:
if len(val) == 0:
return
self.add_key_value(key, val, GGUFValueType.ARRAY)
@staticmethod
@ -845,7 +847,14 @@ class GGUFWriter:
encoded_val = val.encode("utf-8") if isinstance(val, str) else val
kv_data += self._pack("Q", len(encoded_val))
kv_data += encoded_val
elif vtype == GGUFValueType.ARRAY and isinstance(val, Sequence) and val:
elif vtype == GGUFValueType.ARRAY:
if not isinstance(val, Sequence):
raise ValueError("Invalid GGUF metadata array, expecting sequence")
if len(val) == 0:
raise ValueError("Invalid GGUF metadata array. Empty array")
if isinstance(val, bytes):
ltype = GGUFValueType.UINT8
else: