Fix conv padding for even kernel widths

fairseq/models/fconv.py

@@ -58,7 +58,7 @@ class FConvEncoder(FairseqEncoder):
         self.projections = nn.ModuleList()
         self.convolutions = nn.ModuleList()
         for (out_channels, kernel_size) in convolutions:
-            pad = (kernel_size - 1) // 2
+            pad = (kernel_size - 1) / 2
             self.projections.append(Linear(in_channels, out_channels)
                                     if in_channels != out_channels else None)
             self.convolutions.append(

fairseq/modules/conv_tbc.py

@@ -59,7 +59,7 @@ class ConvTBCFunction(Function):
         kernel_size = weight_size[0]
 
         output = input.new(
-            input_size[0] - kernel_size + 1 + pad * 2,
+            input_size[0] - kernel_size + 1 + int(pad * 2),
             input_size[1],
             weight_size[2])