remove tensorboardX; use torch.utils.tensorboard

logger.py

@@ -1,6 +1,6 @@
 import random
 import torch
-from tensorboardX import SummaryWriter
+from torch.utils.tensorboard import SummaryWriter
 from plotting_utils import plot_alignment_to_numpy, plot_spectrogram_to_numpy
 from plotting_utils import plot_gate_outputs_to_numpy
 

requirements.txt

@@ -4,6 +4,5 @@ numpy==1.13.3
 inflect==0.2.5
 librosa==0.6.0
 scipy==1.0.0
-tensorboardX==1.1
 Unidecode==1.0.22
 pillow