wkcn commented on a change in pull request #16234: [MXNET-1426] Fix the wrong
result of sum, mean, argmin, argmax when inputs contain inf or nan
URL: https://github.com/apache/incubator-mxnet/pull/16234#discussion_r326923532
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File path: 3rdparty/mshadow/mshadow/extension/reduce_with_axis.h
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@@ -112,7 +112,7 @@ struct Plan<ReduceWithAxisExp<Reducer, SrcExp, DType,
dimsrc, mask, dimdst>, DTy
index_t z = (x*size_+k)*trailing_+y;
DType tmp = res;
Reducer::Reduce(res, src_.Eval(z/last_, z%last_));
- if (tmp != res) {
+ if (tmp != res && !isnan_typed::IsNan(tmp)) {
Review comment:
`NaN` is treated as greater/less than all other values in argmax/ argmin.
NaN is not equal to any number including NaN.
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