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Mention --gpu option in the MNIST tutorial #85

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Jun 8, 2017
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Mention --gpu option in the MNIST tutorial #85

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70010ed
Added some texts
keisukefukuda Jun 8, 2017
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keisukefukuda Jun 8, 2017
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12 changes: 11 additions & 1 deletion docs/source/tutorial/step1_communicators_optimizers.rst
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Expand Up @@ -63,11 +63,21 @@ Run

With the above two changes, your script is ready for distributed
training. Invoke your script with ``mpiexec`` or ``mpirun`` (see your
MPI's manual for details). The following is an example to execute the
MPI's manual for details). The following is an example of executing the
training with four processes at localhost::

$ mpiexec -n 4 python train_mnist.py

In the non-GPU mode, you may see a warning like shown below,
but this message is harmless, and you can ignore it for now ::

Warning: using naive communicator because only naive supports CPU-only execution


If you have GPUs, you may also want to try::

$ mpiexec -n 4 python train_mnist.py --gpu
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I think that it is necessary to explain that the command requires 4 GPUs in a node.

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reflected the comment and fixed the text.



Multi-node execution
~~~~~~~~~~~~~~~~~~~~
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