Fix multi gpu training via Dataparallel #234
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When calling FARMReader.train() with multiple GPUs using DataParallel, we were running into an error because we apply DataParallel twice(!). Once when initializing the FARMReader (so that we can use Dataparallel for inference), and then again in train() when we call initialize_optimizer().
This is a quick fix, but we should fix it upstream in FARM (e.g. by adding a check in optimize_model() and avoid applying DataParallel there if it was already done before).
Fixing #224