asitstands commented on issue #11031: Use dtype=int for the indices returned by TopK URL: https://github.com/apache/incubator-mxnet/issues/11031#issuecomment-392075252 This could break existing code. Sometimes the resulting array of indices is subject to another operation. Then the result can become different if the dtype of the index array changes. Or it can make an error as some opertions can be applied to only floating point arrays. ```python nd.topk(nd.arange(10), k=2).mean() ``` Currently the result is `[8.5]`, but the result is `[8]` if the dtype is integer. ```python nd.linalg.gemm2(nd.topk(x, k=2), y) ``` Currently this is allowed, but it'll cause an error if the dtype changes to integer. `multinomial` has a similar but opposite issue. It returns an index array of integer type, but it would be convenient to have floating point array sometimes (PR #10970). I think that it would be better if we can make `multinomial` and `topk` consistent.
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