[GitHub] [incubator-mxnet] jens-maus commented on issue #5296: KVStore error with certain optimizer settings - R-package

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jens-maus commented on issue #5296: KVStore error with certain optimizer settings - R-package
URL: https://github.com/apache/incubator-mxnet/issues/5296#issuecomment-491798252
 
 
   @jeremiedb I just encountered the same issue here with using the R package and multiple GPU training: The training broke with:
   
   ```
   Batch size: 100 
   Auto-select kvstore type = local_update_cpu
   Start training with 2 devices
   Error in kvstore$set.optimizer(optimizer) : 
     kvstore.cc:124: RCheck failed: names.size() == 2 && names[0] == "create.state" && names[1] == "update" Invalid optimizer
   Calls: unetDelineation ... <Anonymous> -> mx.model.train2 -> <Anonymous> -> .External
   Execution halted
   ```
   
   However, forcing the kvstore to `local_allreduce_device` seem to have resolved the issue. Is there anything that I should be concerned of or does the R-package still lack some fixes to work with the default `local_update_cpu`?

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