harusametime commented on issue #10528: [MXNET-316] Remove empty buckets 
causing index errors
URL: https://github.com/apache/incubator-mxnet/pull/10528#issuecomment-381775912
   @ThomasDelteil I agree to your suggestion on making two buckets empty with 
`-1`. The previous test evaluates the accuracy by MSE and uses `assert` for 
guaranteeing high accuracy. However, the metric should be Perplexity for 
multiclass classification instead of MSE. Then it turns out the accuracy is not 
so good because this test requires RNN to forecast random sequence of words. We 
could not use `assert` for the accuracy. I will update my test with the 
comments soon.

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