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Initial mixed-precision training (#196)
* Initial multi-precision training Adds fp16 support via apex.amp Also switches communication to apex.DistributedDataParallel * Add Apex install to dockerfile * Fixes from @fmassa review Added support to tools/test_net.py SOLVER.MIXED_PRECISION -> DTYPE \in {float32, float16} apex.amp not installed now raises ImportError * Remove extraneous apex DDP import * Move to new amp API
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