LayerNormalization broadcast (limited support for axis=2) #23297
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Description
Spec of LayerNormalization supports unidirectional broadcasting (tensors Scale and B should be unidirectional broadcastable to tensor X).
https://onnx.ai/onnx/operators/onnx__LayerNormalization.html
Here we add limited support: axis=2; scale/bias has same shape; scale/bias/X have same number of dimensions.
Motivation and Context