[Relay][Bugfix] fix the wrong calculate logic of operator flip in PyTorch frontend #15752
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The original implementation of Flip in PyTorch converter mistaken the type of attribute
axis
in the Flip operator as an integer. Thus, It only parses the first element of theaxis
and will give a wrong calculation result when the length ofaxis
is more than one. According to the PyTorch documentation here, the type ofaxis
is a list or tuple.This PR corrected the incorrect implementation of the algorithm of
torch.flip
converter and added a regression test.cc @echuraev @Hzfengsy @MasterJH5574