jackyblackme commented on issue #371: computing image mean
URL: https://github.com/apache/incubator-mxnet/issues/371#issuecomment-380034766
   Yeah, Put mean_img="path/to/mean.nd". If the file does not exist, 
ImageRecordIterator will first create this file and calculate mean value, store 
result in the file. And then start training. Detail can be seen in file 
"iter_image_recordio_2.cc", the new version of recordio data iterator under 
"mxnetRoot/src/io/iter_image_recordio_2.cc". Maybe from line 216, the Normalize 
init and the CreateMeanImg function.

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