add return type

Author: mshr-h

python/tvm/relax/frontend/torch/fx_translator.py

@@ -749,7 +749,7 @@ def _conv1d_impl(
         padding: Optional[Tuple],
         dilation: Optional[Tuple],
         groups: Optional[Tuple],
-    ):
+    ) -> relax.Var:
         conv1d = self.block_builder.emit(
             relax.op.nn.conv1d(
                 x,