[Unity][Relax] Support Dynamic Tensor as Index, torch frontend #15884
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Add support: allow one dynamic tensor as torch.tensor's index
In Stable Diffusion XL:
e.g.
output = input1 [input2.argmax(dim = -1), ]Before: we can only support int, slice, elipsis, None
Now: we can have one dynamic torch.tensor in index, which allows us to represent SD XL correctly.
Behaviors aligns with torch.tensor:
as shown in test cases
Future TODO: Support other "fancy indexing" methods in torch.tensor, (e.g. multiple tensors as index) which requires some new relax ops