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[XNNPACK][Weights Cache] Use sha256 hash of bytes instead of tensor name #9333

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Merged
merged 3 commits into from
Mar 19, 2025
Merged

[XNNPACK][Weights Cache] Use sha256 hash of bytes instead of tensor name #9333

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a51fd69
[XNNPACK][Weights Cache] Use sha256 hash of bytes instead of tensor name
mcr229 Mar 17, 2025
606418d
Update on "[XNNPACK][Weights Cache] Use sha256 hash of bytes instead …
mcr229 Mar 17, 2025
d655e3a
Update on "[XNNPACK][Weights Cache] Use sha256 hash of bytes instead …
mcr229 Mar 18, 2025
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14 changes: 9 additions & 5 deletions backends/xnnpack/operators/node_visitor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
# LICENSE file in the root directory of this source tree.

import ctypes
import hashlib

from typing import cast, Dict, List, Optional, Tuple

Expand Down Expand Up @@ -34,7 +35,6 @@
check_or_raise,
get_input_node,
get_param_tensor,
get_tensor_name,
is_param_node,
PERM_NCHW_TO_NHWC,
)
Expand Down Expand Up @@ -576,15 +576,19 @@ def get_serialized_buffer_index(
if quant_params is not None and quant_params.is_qc4w:
const_val = self.convert_to_qc4w(const_val)

array_type = ctypes.c_char * const_val.untyped_storage().nbytes()
size = const_val.untyped_storage().nbytes()
array_type = ctypes.c_char * size
array = ctypes.cast(
const_val.untyped_storage().data_ptr(),
ctypes.POINTER(array_type),
).contents

named_key = get_tensor_name(self.exported_program, get_attr_node)
if named_key == "":
raise ValueError(f"Tensor from node: {get_attr_node} has no name")
check_or_raise(
size > 0,
f"Serializing constant data node {tensor} but tensor value has no bytes",
)
sha256_hash = hashlib.sha256(bytes(array))
named_key = sha256_hash.hexdigest()

size = const_val.untyped_storage().nbytes()
xnn_graph.constant_data.append(
Expand Down
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