!316 updata tacotron2 with modelarts compatibility

research/audio/tacotron2/README.md

research/audio/tacotron2/eval.py

research/audio/tacotron2/ljspeech_config.yaml

research/audio/tacotron2/model_utils/__init__.py

research/audio/tacotron2/model_utils/config.py

research/audio/tacotron2/model_utils/device_adapter.py

research/audio/tacotron2/model_utils/local_adapter.py

research/audio/tacotron2/model_utils/moxing_adapter.py

research/audio/tacotron2/requirements.txt

research/audio/tacotron2/scripts/run_distribute_train.sh

research/audio/tacotron2/scripts/run_eval.sh

research/audio/tacotron2/scripts/run_standalone_train.sh

research/audio/tacotron2/src/callback.py

research/audio/tacotron2/src/dataset.py

research/audio/tacotron2/src/hparams.py

research/audio/tacotron2/src/rnns.py

research/audio/tacotron2/src/tacotron2.py

research/audio/tacotron2/train.py