[TorchToStableHLO] fix: NLLLoss conversion error #4442
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Pytorch NLLLoss had a conversion error issue to StableHLO.
The conversion was blocked by error:
Assertion isa<To>(Val) && "cast<Ty>() argument of incompatible type!"'failed. because torch-mlir's NllLoss decomposition createstorch.prim.NumToTensor.Scalar %int0 : !torch.int -> !torch.vtensor<*,si64>.This is problematic because StableHLO lowering doesn't know how to handle a tensor
!torch.vtensor<*,si64>of empty shape.Fixed by modifying the code to produce
!torch.vtensor<[1],si64>.