szha commented on issue #7802: how can i do a image mean substraction operation 
in symbol?
URL: 
https://github.com/apache/incubator-mxnet/issues/7802#issuecomment-327978781
 
 
   It's probably easier if you do the subtraction in the data iterator. There 
are a number of solutions readily available:
   https://mxnet.apache.org/api/python/io.html#mxnet.io.ImageRecordIter
   https://mxnet.apache.org/api/python/image.html#overview
 
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