Merge pull request #1 from abhinav-bohra/1036-fixes-visualbert-attention

[fix] VisualBERT returns attention tuple facebookresearch#1036

mmf/modules/hf_layers.py

@@ -280,11 +280,17 @@ def forward(
         attention_mask: Optional[Tensor],
         encoder_hidden_states: Optional[Tensor] = None,
         encoder_attention_mask: Optional[Tensor] = None,
-        output_attentions: bool = False,
-        output_hidden_states: bool = False,
+        output_attentions: bool = None,
+        output_hidden_states: bool = None,
         return_dict: bool = False,
         head_mask: Optional[Tensor] = None,
     ) -> Tuple[Tensor]:
+
+        if output_attentions is None:
+            output_attentions = self.output_attentions            
+        if output_hidden_states is None:
+            output_hidden_states = self.output_hidden_states
+
         all_hidden_states = ()
         all_attentions = ()
         for i, layer_module in enumerate(self.layer):