onnxruntime

040ae1f5 - [Kernel] Fix bug in Einsum implementation when a lone operand had a reduction operation (#27225)

[Kernel] Fix bug in Einsum implementation when a lone operand had a reduction operation (#27225) ### Description When the lone operand had a reduction operation in Einsum, there was a mis-management in the shape which led to a mis-match in terms of the subscript indices in the output as deciphered from the Einsum equation and the rank of the candidate output being produced after the reduction operation which caused issues while finalizing the output of the Einsum op. This change fixes the bug and adds a test ### Motivation and Context Resolve https://github.com/microsoft/onnxruntime/issues/18654 --------- Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>