[GitHub] leezu opened a new pull request #10772: Fix row_sparse_pull with single gpu

[GitBox <gi...@apache.org>]

leezu opened a new pull request #10772: Fix row_sparse_pull with single gpu
URL: https://github.com/apache/incubator-mxnet/pull/10772
 
 
   ## Description ##
   When using the kvstore on a single device, so copy of the source array would be created when pushing to the kvstore:
   
       // avoid extra copy for single device, but it may bring problems for
       // abnormal usage of kvstore
       if (src.size() == 1) {
         return src[0];
       }
       
   When row sparse pulling from the kvstore, this would lead to a deadlock as both source and target arrays were identical. This PR makes sure they are not identical.
   
   Thanks @eric-haibin-lin for helping to find the cause.

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