pdmengmeng opened a new issue #7408: How to do a sobel operation in symbol layer
URL: https://github.com/apache/incubator-mxnet/issues/7408
    there is a symbol layer , its size is ( 1 ,1 ,300 ,300 ) .How to use it to 
do a sobel operation.
   I kown that  we need to use symbol.broadcast_add/broadcast_sub......
   But how to select the specif area, Symbol can be used as numpy ?  
   Symbol[ : ,: , 1:W, 1: H] - Symbol [:,:,0:W-1,  0: H-1]  this is right?
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