add comment

Author: JyotinderSingh

keras_remote/data/data.py

@@ -23,6 +23,8 @@ def _hash_single_file(fpath: str, relpath: str) -> bytes:
   h = hashlib.sha256()
   h.update(relpath.encode("utf-8"))
   h.update(b"\0")
+  # 64 KB: standard buffer size used by shutil.copyfileobj and
+  # hashlib.file_digest, aligns with NVMe page sizes.
   with open(fpath, "rb") as f:
     for chunk in iter(partial(f.read, 65536), b""):
       h.update(chunk)