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wasi_nn_tensorflowlite.cpp: fix get_output return size (#4390)

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it should be byte size, not the number of (fp32) values.

i'm ambivalent about how to deal with the compatibility for
the legacy wamr-specific "wasi_nn". for now, i avoided changing it.
(so that existing tests using the legacy abi, namely test_tensorflow.c
and test_tensorflow_quantized.c, passes as they are.)
if we have any users who still want to use the legacy abi,
i suppose they consider the compatibility is more important
than the consistency with other backends.

cf. https://github.com/bytecodealliance/wasm-micro-runtime/issues/4376
This commit is contained in:
YAMAMOTO Takashi 2025-06-24 21:38:19 +09:00 committed by GitHub
parent 70c39bae77
commit 8289452abb
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1 changed files with 57 additions and 16 deletions
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73
core/iwasm/libraries/wasi-nn/src/wasi_nn_tensorflowlite.cpp
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@ -389,23 +389,34 @@ get_output(void *tflite_ctx, graph_execution_context ctx, uint32_t index,
return too_large;
}
uint32_t model_tensor_size = 1;
for (int i = 0; i < (int)tensor->dims->size; ++i)
model_tensor_size *= (uint32_t)tensor->dims->data[i];
if (*output_tensor_size < model_tensor_size) {
NN_ERR_PRINTF("Insufficient memory to copy tensor %d", index);
return too_large;
}
if (tensor->quantization.type == kTfLiteNoQuantization) {
NN_DBG_PRINTF("No quantization information");
float *ot =
tfl_ctx->interpreters[ctx].interpreter->typed_output_tensor<float>(
index);
int size = model_tensor_size * sizeof(float);
bh_memcpy_s(output_tensor, size, ot, size);
#if WASM_ENABLE_WASI_EPHEMERAL_NN != 0
if (*output_tensor_size < tensor->bytes) {
NN_ERR_PRINTF("Insufficient memory to copy tensor %d", index);
return too_large;
}
#else
/*
* for now, maintain the bug-to-bug compatibility with the old abi,
* where the size here is the number of fp32, not bytes.
*/
if (*output_tensor_size < tensor->bytes / sizeof(float)) {
NN_ERR_PRINTF("Insufficient memory to copy tensor %d", index);
return too_large;
}
#endif
bh_memcpy_s(output_tensor, *output_tensor_size, tensor->data.data,
tensor->bytes);
#if WASM_ENABLE_WASI_EPHEMERAL_NN != 0
*output_tensor_size = tensor->bytes;
#else
/*
* for now, maintain the bug-to-bug compatibility with the old abi,
* where the size here is the number of fp32, not bytes.
*/
*output_tensor_size = tensor->bytes / sizeof(float);
#endif
}
else { // TODO: Assuming uint8 quantized networks.
TfLiteAffineQuantization *quant_info =
@ -414,6 +425,27 @@ get_output(void *tflite_ctx, graph_execution_context ctx, uint32_t index,
NN_ERR_PRINTF("Quantization per channel is not supported");
return runtime_error;
}
uint32_t model_tensor_size = 1;
for (int i = 0; i < (int)tensor->dims->size; ++i)
model_tensor_size *= (uint32_t)tensor->dims->data[i];
#if WASM_ENABLE_WASI_EPHEMERAL_NN != 0
if (*output_tensor_size / sizeof(float) < model_tensor_size) {
NN_ERR_PRINTF("Insufficient memory to copy tensor %d", index);
return too_large;
}
#else
/*
* for now, maintain the bug-to-bug compatibility with the old abi,
* where the size here is the number of fp32, not bytes.
*/
if (*output_tensor_size < model_tensor_size) {
NN_ERR_PRINTF("Insufficient memory to copy tensor %d", index);
return too_large;
}
#endif
uint8_t *ot = tfl_ctx->interpreters[ctx]
.interpreter->typed_output_tensor<uint8_t>(index);
@ -426,9 +458,18 @@ get_output(void *tflite_ctx, graph_execution_context ctx, uint32_t index,
for (uint32_t i = 0; i < model_tensor_size; ++i) {
output_tensor_f[i] = (ot[i] - zero_point) * scale;
}
#if WASM_ENABLE_WASI_EPHEMERAL_NN != 0
*output_tensor_size = model_tensor_size * sizeof(float);
#else
/*
* for now, maintain the bug-to-bug compatibility with the old abi,
* where the size here is the number of fp32, not bytes.
*/
*output_tensor_size = model_tensor_size;
#endif
}
*output_tensor_size = model_tensor_size;
return success;
}