[Fix] Fix the bug when input mask is not '0-1-tensor' in masked_conv (#2423)

mmcv/ops/masked_conv.py

@@ -58,6 +58,8 @@ class MaskedConv2dFunction(Function):
             if mask.size()[1:] != output.size()[2:]:
                 raise ValueError(
                     'The mask is inconsistent with the shape of output_conv.')
+            mask = mask > 0
+            mask = mask.type(output.dtype)
             output = output * mask
             return output