[GitHub] formath commented on issue #7934: Bug of group2ctx? Wrong device placement?

2017-09-20 Thread git 
formath commented on issue #7934: Bug of group2ctx? Wrong device placement?
URL: 
https://github.com/apache/incubator-mxnet/issues/7934#issuecomment-330759033
 
 
   `exe = x.bind(mx.gpu(), {}, group2ctx={"a": mx.cpu(), "b": mx.gpu()})` The 
default context just indicate this executor run on this context, but not the 
`node` or `op` in symbol.
 

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[GitHub] formath commented on issue #7934: Bug of group2ctx? Wrong device placement?

2017-09-20 Thread git 
formath commented on issue #7934: Bug of group2ctx? Wrong device placement?
URL: 
https://github.com/apache/incubator-mxnet/issues/7934#issuecomment-330759033
 
 
   `exe = x.bind(mx.gpu(), {}, group2ctx={"a": mx.cpu(), "b": mx.gpu()})` The 
default context is just indicate this executor run on this context, but not the 
`node` or `op` in symbol.
 

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[GitHub] formath commented on issue #7934: Bug of group2ctx? Wrong device placement?

2017-09-19 Thread git 
formath commented on issue #7934: Bug of group2ctx? Wrong device placement?
URL: 
https://github.com/apache/incubator-mxnet/issues/7934#issuecomment-330749338
 
 
   Depends on the device id of its first control node or input node. Your op 
may not assigned by this.
 

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[GitHub] formath commented on issue #7934: Bug of group2ctx? Wrong device placement?

2017-09-19 Thread git 
formath commented on issue #7934: Bug of group2ctx? Wrong device placement?
URL: 
https://github.com/apache/incubator-mxnet/issues/7934#issuecomment-330742175
 
 
   During `PlaceDevice`, if an `op` can't be assigned a device id, its device 
id will be set `0`. And to assign a default context is done after 
`PlaceDevice`, so it will not works actually. `0` indicates which context 
depends on the `group2ctx`. More deeply, it is the index when traversing a map, 
so alphabetical. It is should be a bug. @tqchen @piiswrong
 

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