add extra_config keys into the default config of tacotron

examples/tacotron2/config.py

@@ -32,6 +32,7 @@ _C.data = CN(
 _C.model = CN(
     dict(
         vocab_size=37,  # set this according to the frontend's vocab size
+        n_tones=None, 
         reduction_factor=1,  # reduction factor
         d_encoder=512,  # embedding & encoder's internal size
         encoder_conv_layers=3,  # number of conv layer in tacotron2 encoder
@@ -54,6 +55,7 @@ _C.model = CN(
         p_decoder_dropout=
         0.1,  # droput probability of second rnn layer in decoder
         p_postnet_dropout=0.5,  # droput probability in decoder postnet
+        d_global_condition=None,
         use_stop_token=
         True,  # wherther to use binary classifier to predict when to stop
         use_guided_attention_loss=False,  # whether to use guided attention loss