Adding mixed precision training support #390
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This PR makes use of APEX (https://github.com/NVIDIA/apex) to provide automatic mixed precision training.
Automatic mixed precision training makes use of both FP32 and FP16 precisions where appropriate. FP16 operations can leverage the Tensor cores on NVIDIA GPUs (Volta, Turing or newer architectures) for much improved throughput.
Automatic mixed precision training can be enabled via an appropriate flag passed to the train script: