anirudh2290 commented on issue #9912: No training happening when CSVIter() is 
used.
URL: 
https://github.com/apache/incubator-mxnet/issues/9912#issuecomment-378840196
 
 
   This doesnt seem like a bug. The reason that you see all those Nans is 
because you have already iterated through your dataset before the call to 
evaluate_accuracy. Your first example in mxnet-csviter where you dont see this 
issue is because evaluate_accuracy doesn't iterate through your dataset. I 
think the gluon documentation about DataLoader probably was confusing : 
http://gluon.mxnet.io/chapter04_convolutional-neural-networks/cnn-gluon.html. 
Maybe it should be called out in the book how to replace DataLoader with 
non-gluon iterators.

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