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Adding comments #107

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merged 3 commits into from
Aug 17, 2017
Merged

Adding comments #107

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189d447
Remove unnecessary comment
iwiwi Aug 15, 2017
de0ff50
Describe why we don't use MPI4py's scatter
iwiwi Aug 15, 2017
9730427
Describe why we delay the communicator initialization
iwiwi Aug 15, 2017
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Describe why we don't use MPI4py's scatter
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@iwiwi
iwiwi committed Aug 15, 2017
commit de0ff5027576e5df05ac100a16d177fc13b08e88
3 changes: 2 additions & 1 deletion chainermn/dataset.py
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Expand Up @@ -25,7 +25,8 @@ def scatter_dataset(dataset, comm):
assert hasattr(comm, 'send')
assert hasattr(comm, 'recv')

# TODO(akiba): write why we do not use mpi_comm.scatter
# We cannot use `mpi_comm.scatter`. This is due to MPI4py's bug.
# For large datasets, when using `mpi_comm.scatter`, it causes MemoryError.
if comm.rank == 0:
mine = None
n_total_samples = len(dataset)
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