x10000year opened a new issue #7934: Bug of group2ctx? Wrong device placement?
URL: https://github.com/apache/incubator-mxnet/issues/7934
 
 
   For the following code:
   
   x = mx.symbol.MyOp()
   exe = x.bind(mx.gpu(), {}, group2ctx={"a": mx.cpu(), "b": mx.gpu()})
   exe.forward()
   
   where MyOp is a custom operator written in c++, which prints "CPU" if it is 
run in cpu context, or prints "GPU" if run in gpu context.
   
   I don't use mx.AttrScope to specify the group of x, so default context 
should be used for x. However, the above code prints "CPU", which means that x 
is run in cpu context. Why?
   
   If I set group2ctx={"b": mx.cpu(), "a": mx.gpu()}. Then it prints "GPU".
   
   Basically, I found that the group that has the alphabetically smaller name 
is chosen for x. Very strange.
   
   Is this a bug?
 
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