Deepspeed integration

allennlp/training/__init__.py

@@ -1,6 +1,7 @@
 from allennlp.training.checkpointer import Checkpointer
 from allennlp.training.tensorboard_writer import TensorboardWriter
 from allennlp.training.no_op_trainer import NoOpTrainer
+from allennlp.training.deepspeed_trainer import DeepspeedTrainer
 from allennlp.training.trainer import (
     Trainer,
     GradientDescentTrainer,