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apex-master/examples/simple/distributed/README.md

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+**distributed_data_parallel.py** and **run.sh** show an example using Amp with
+[apex.parallel.DistributedDataParallel](https://nvidia.github.io/apex/parallel.html) or
+[torch.nn.parallel.DistributedDataParallel](https://pytorch.org/docs/stable/nn.html#distributeddataparallel)
+and the Pytorch multiprocess launcher script,
+[torch.distributed.launch](https://pytorch.org/docs/master/distributed.html#launch-utility).
+The use of `Amp` with DistributedDataParallel does not need to change from ordinary 
+single-process use.  The only gotcha is that wrapping your model with `DistributedDataParallel` must
+come after the call to `amp.initialize`.  Test via
+```bash
+bash run.sh
+```
+
+**This is intended purely as an instructional example, not a performance showcase.**