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Throw for scalar input to Shape. #18504

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Throw for scalar input to Shape. #18504

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2 changes: 2 additions & 0 deletions onnxruntime/core/providers/cpu/tensor/shape_op.h
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Expand Up @@ -36,6 +36,8 @@ class Shape final : public OpKernel {
const TensorShape& input_shape = input->Shape();

int64_t rank = gsl::narrow_cast<int64_t>(input_shape.NumDimensions());
// ONNX shape inferencing doesn't work with a scalar. Spec does not say it's unsupported.
ORT_ENFORCE(rank != 0, "Shape of a scalar is not supported");

if (!needs_slicing_) { // vanilla use of Shape (no slicing)
Tensor* output = context->Output(0, {rank});
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