[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
axisin the Flip operator as an integer. Thus, It only parses the first element of theaxisand will give a wrong calculation result when the length ofaxisis more than one. According to the PyTorch documentation here, the type ofaxisis a list or tuple.This PR corrected the incorrect implementation of the algorithm of
torch.flipconverter and added a regression test.cc @echuraev @Hzfengsy @MasterJH5574