[GitHub] [singa-doc] nudles commented on issue #14: rearrange contents in dist-train.md

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nudles commented on issue #14: rearrange contents in dist-train.md
URL: https://github.com/apache/singa-doc/pull/14#issuecomment-609033123
 
 
   Then would it be better to design the APIs in this way:
   1. For training with MPI
   ```python
    # in mnist_mpi.py
   if __name__  == '__main__':
     sgd = ...
     sgd = DistOpt(sgd)
     train_mnist(sgd, sparse, topK)
   ```
   
   2. For training via multiprocessing
   ```python
    # in mnist_multiprocessing.py
   if __name__  == '__main__':
     nccl_id = ...
     sgd = ...
     sgd = DistOpt(sgd, num_gpu, nccl_id)
     train_mnist(sgd, sparse, topK)
   ```
   
   Even if you use socket, multiprocessing can only run on a single node, hence 
num_gpu = gpu_per_node.
   

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