Support axis equal to tensor rank in Flatten operator
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Unlike most operators with an `axis` attribute, the value here can be equal to the tensor rank because it is a count of dimensions. Per spec [^1]: > Indicate up to which input dimensions (exclusive) should be flattened to > the outer dimension of the output. The value for axis must be in the range > [-r, r], where r is the rank of the input tensor. [^1]: https://onnx.ai/onnx/operators/onnx__Flatten.html#attributes
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Unlike most operators with an
axisattribute, the value here can be equal to the tensor rank because it is a count of dimensions. Per spec 1:Footnotes
https://onnx.ai/onnx/operators/onnx__Flatten.html#attributes ↩