修复CRF中seq_len_to_byte_mask的bug

fastNLP/modules/decoder/CRF.py

@@ -15,7 +15,7 @@ def seq_len_to_byte_mask(seq_lens):
     # return value: ByteTensor, batch_size x max_len
     batch_size = seq_lens.size(0)
     max_len = seq_lens.max()
-    broadcast_arange = torch.arange(max_len).view(1, -1).repeat(batch_size, 1)
+    broadcast_arange = torch.arange(max_len).view(1, -1).repeat(batch_size, 1).to(seq_lens.device)
     mask = broadcast_arange.lt(seq_lens.float().view(-1, 1))
     return mask