Use 0D tensors for scalar inputs in testcases #3583
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Description
Testcases of OneHot, SequenceInsert, and NonMaxSuppression were using 1D tensor as scalar inputs but their documents say they accept scalars.
Motivation and Context
These tests look inconsistent with the document and I could not find any document which mentions 1D tensor with a single element can be treated as a scalar. Especially, the document of SequenceInsert clearly states
position
should be "tensor of empty shape".I felt the second input of TopK op should be also a scalar, but the document says it takes 1D tensor with a single element.