Recent changes in mxnet master introduced a bug into the topk operator. Below code example will output [ 274232. 179574. 274233. 274231.] with mxnet-cu90==1.3.0b20180810 but [ 274232. 179574. 274232. 274232.] with mxnet-cu90==1.3.0b20180814. Likely #12085 is at fault.
See https://github.com/apache/incubator-mxnet/issues/12197 for more info. I think this should be considered a release blocker for the 1.3 release. Note this breaks some parts of the KDD 18 MXNet / Gluon tutorial which is scheduled for next Tuesday http://www.kdd.org/kdd2018/hands-on-tutorials/view/mxnet-with-a-focus-on-nlp . (We can work around by asking people to install the 0810 version though.)
