将整个nltk_data下载下来放到指定目录下，不会出现下面这个错误了：
[nltk_data] Error loading averaged_perceptron_tagger: <urlopen error [nltk_data] [Errno 99] Cannot assign requested address> [nltk_data] Error loading cmudict: <urlopen error [Errno 99] Cannot [nltk_data] assign requested address>但训练时，还是有这个错误：
Traceback (most recent call last): File "examples/tacotron2/train_tacotron2.py", line 488, in <module> main() File "examples/tacotron2/train_tacotron2.py", line 436, in main tacotron2 = TFTacotron2(config=tacotron_config, training=True, name="tacotron2") File "/root/anaconda3/envs/tts/lib/python3.6/site-packages/tensorflow_tts/models/tacotron2.py", line 746, in __init__ super().__init__(self, **kwargs) File "/root/anaconda3/envs/tts/lib/python3.6/site-packages/tensorflow/python/training/tracking/base.py", line 457, in _method_wrapper result = method(self, *args, **kwargs) File "/root/anaconda3/envs/tts/lib/python3.6/site-packages/tensorflow/python/keras/engine/training.py", line 262, in __init__ 'name', 'autocast'}) File "/root/anaconda3/envs/tts/lib/python3.6/site-packages/tensorflow/python/keras/utils/generic_utils.py", line 778, in validate_kwargs raise TypeError(error_message, kwarg) TypeError: ('Keyword argument not understood:', 'training')
