remove Variable from losses.py

layers/losses.py

@@ -1,6 +1,5 @@
 import torch
 from torch.nn import functional
-from torch.autograd import Variable
 from torch import nn
 
 
@@ -11,7 +10,6 @@ def _sequence_mask(sequence_length, max_len=None):
     batch_size = sequence_length.size(0)
     seq_range = torch.arange(0, max_len).long()
     seq_range_expand = seq_range.unsqueeze(0).expand(batch_size, max_len)
-    seq_range_expand = Variable(seq_range_expand)
     if sequence_length.is_cuda:
         seq_range_expand = seq_range_expand.cuda()
     seq_length_expand = (sequence_length.unsqueeze(1)