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how to reproduce such case in layer tests?
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this is rare case, when something went wrong with normalization in tracing, I think this is difficult to catch such behaviour in layer test and we can trust to torch aliasing system that torch.concatenate is alias for torch.cat
https://github.com/pytorch/pytorch/blob/dbed747aae223d53ca4e22fe45c24d1d9a8b4432/torch/csrc/jit/passes/normalize_ops.cpp#L131