support sparse output for lookup table grad op #5145
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Add
is_sparseattribute for lookup table operator. And book04.word2vec can run in sparse update mode. But there is some memory error after some batches training. It can be generated stably after 21 batches. So, I will debug this to make sure sparse update is worked.Updated:
The bug has been found with the help of @reyoung . In Lookup Table Grad operator, there is a bug of array bounds.