[ViT, BEiT, DeiT, DPT] Improve code

src/transformers/models/deit/modeling_deit.py

@@ -542,7 +542,8 @@ def forward(
         pooled_output = self.pooler(sequence_output) if self.pooler is not None else None
 
         if not return_dict:
-            return (sequence_output, pooled_output) + encoder_outputs[1:]
+            head_outputs = (sequence_output, pooled_output) if pooled_output is not None else (sequence_output,)
+            return head_outputs + encoder_outputs[1:]
 
         return BaseModelOutputWithPooling(
             last_hidden_state=sequence_output,
@@ -662,7 +663,7 @@ def forward(
             masked_im_loss = (reconstruction_loss * mask).sum() / (mask.sum() + 1e-5) / self.config.num_channels
 
         if not return_dict:
-            output = (reconstructed_pixel_values,) + outputs[2:]
+            output = (reconstructed_pixel_values,) + outputs[1:]
             return ((masked_im_loss,) + output) if masked_im_loss is not None else output
 
         return MaskedLMOutput(
@@ -775,7 +776,7 @@ def forward(
                 loss_fct = BCEWithLogitsLoss()
                 loss = loss_fct(logits, labels)
         if not return_dict:
-            output = (logits,) + outputs[2:]
+            output = (logits,) + outputs[1:]
             return ((loss,) + output) if loss is not None else output
 
         return ImageClassifierOutput(
@@ -882,7 +883,7 @@ def forward(
         logits = (cls_logits + distillation_logits) / 2
 
         if not return_dict:
-            output = (logits, cls_logits, distillation_logits) + outputs[2:]
+            output = (logits, cls_logits, distillation_logits) + outputs[1:]
             return output
 
         return DeiTForImageClassificationWithTeacherOutput(

src/transformers/models/dpt/modeling_dpt.py

@@ -750,7 +750,8 @@ def forward(
         pooled_output = self.pooler(sequence_output) if self.pooler is not None else None
 
         if not return_dict:
-            return (sequence_output, pooled_output) + encoder_outputs[1:]
+            head_outputs = (sequence_output, pooled_output) if pooled_output is not None else (sequence_output,)
+            return head_outputs + encoder_outputs[1:]
 
         return BaseModelOutputWithPooling(
             last_hidden_state=sequence_output,
@@ -938,7 +939,7 @@ def forward(
             return_dict=return_dict,
         )
 
-        hidden_states = outputs.hidden_states if return_dict else outputs[2]
+        hidden_states = outputs.hidden_states if return_dict else outputs[1]
 
         # only keep certain features based on config.backbone_out_indices
         # note that the hidden_states also include the initial embeddings
@@ -956,9 +957,9 @@ def forward(
 
         if not return_dict:
             if output_hidden_states:
-                output = (predicted_depth,) + outputs[2:]
+                output = (predicted_depth,) + outputs[1:]
             else:
-                output = (predicted_depth,) + outputs[3:]
+                output = (predicted_depth,) + outputs[2:]
             return ((loss,) + output) if loss is not None else output
 
         return DepthEstimatorOutput(
@@ -1083,7 +1084,7 @@ def forward(
             return_dict=return_dict,
         )
 
-        hidden_states = outputs.hidden_states if return_dict else outputs[2]
+        hidden_states = outputs.hidden_states if return_dict else outputs[1]
 
         # only keep certain features based on config.backbone_out_indices
         # note that the hidden_states also include the initial embeddings
@@ -1120,9 +1121,9 @@ def forward(
 
         if not return_dict:
             if output_hidden_states:
-                output = (logits,) + outputs[2:]
+                output = (logits,) + outputs[1:]
             else:
-                output = (logits,) + outputs[3:]
+                output = (logits,) + outputs[2:]
             return ((loss,) + output) if loss is not None else output
 
         return SemanticSegmenterOutput(

src/transformers/models/vit/modeling_vit.py

@@ -585,7 +585,8 @@ def forward(
         pooled_output = self.pooler(sequence_output) if self.pooler is not None else None
 
         if not return_dict:
-            return (sequence_output, pooled_output) + encoder_outputs[1:]
+            head_outputs = (sequence_output, pooled_output) if pooled_output is not None else (sequence_output,)
+            return head_outputs + encoder_outputs[1:]
 
         return BaseModelOutputWithPooling(
             last_hidden_state=sequence_output,
@@ -706,7 +707,7 @@ def forward(
             masked_im_loss = (reconstruction_loss * mask).sum() / (mask.sum() + 1e-5) / self.config.num_channels
 
         if not return_dict:
-            output = (reconstructed_pixel_values,) + outputs[2:]
+            output = (reconstructed_pixel_values,) + outputs[1:]
             return ((masked_im_loss,) + output) if masked_im_loss is not None else output
 
         return MaskedLMOutput(
@@ -798,8 +799,9 @@ def forward(
             elif self.config.problem_type == "multi_label_classification":
                 loss_fct = BCEWithLogitsLoss()
                 loss = loss_fct(logits, labels)
+
         if not return_dict:
-            output = (logits,) + outputs[2:]
+            output = (logits,) + outputs[1:]
             return ((loss,) + output) if loss is not None else output
 
         return ImageClassifierOutput(

tests/beit/test_modeling_beit.py

@@ -41,7 +41,7 @@
         BeitForSemanticSegmentation,
         BeitModel,
     )
-    from transformers.models.beit.modeling_beit import BEIT_PRETRAINED_MODEL_ARCHIVE_LIST, to_2tuple
+    from transformers.models.beit.modeling_beit import BEIT_PRETRAINED_MODEL_ARCHIVE_LIST
 
 
 if is_vision_available():
@@ -96,6 +96,10 @@ def __init__(
         self.out_indices = out_indices
         self.num_labels = num_labels
 
+        # in BeiT, the expected seq_len equals the number of patches + 1 (we add 1 for the [CLS] token)
+        num_patches = (image_size // patch_size) ** 2
+        self.expected_seq_length = num_patches + 1
+
     def prepare_config_and_inputs(self):
         pixel_values = floats_tensor([self.batch_size, self.num_channels, self.image_size, self.image_size])
 
@@ -132,22 +136,16 @@ def create_and_check_model(self, config, pixel_values, labels, pixel_labels):
         model.to(torch_device)
         model.eval()
         result = model(pixel_values)
-        # expected sequence length = num_patches + 1 (we add 1 for the [CLS] token)
-        image_size = to_2tuple(self.image_size)
-        patch_size = to_2tuple(self.patch_size)
-        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-        self.parent.assertEqual(result.last_hidden_state.shape, (self.batch_size, num_patches + 1, self.hidden_size))
+        self.parent.assertEqual(
+            result.last_hidden_state.shape, (self.batch_size, self.expected_seq_length, self.hidden_size)
+        )
 
     def create_and_check_for_masked_lm(self, config, pixel_values, labels, pixel_labels):
         model = BeitForMaskedImageModeling(config=config)
         model.to(torch_device)
         model.eval()
         result = model(pixel_values)
-        # expected sequence length = num_patches
-        image_size = to_2tuple(self.image_size)
-        patch_size = to_2tuple(self.patch_size)
-        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-        self.parent.assertEqual(result.logits.shape, (self.batch_size, num_patches, self.vocab_size))
+        self.parent.assertEqual(result.logits.shape, (self.batch_size, self.expected_seq_length - 1, self.vocab_size))
 
     def create_and_check_for_image_classification(self, config, pixel_values, labels, pixel_labels):
         config.num_labels = self.type_sequence_label_size
@@ -312,16 +310,8 @@ def test_attention_outputs(self):
         config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
         config.return_dict = True
 
-        # in BEiT, the seq_len equals the number of patches + 1 (we add 1 for the [CLS] token)
-        image_size = to_2tuple(self.model_tester.image_size)
-        patch_size = to_2tuple(self.model_tester.patch_size)
-        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-        seq_len = num_patches + 1
-        encoder_seq_length = getattr(self.model_tester, "encoder_seq_length", seq_len)
-        encoder_key_length = getattr(self.model_tester, "key_length", encoder_seq_length)
-        chunk_length = getattr(self.model_tester, "chunk_length", None)
-        if chunk_length is not None and hasattr(self.model_tester, "num_hashes"):
-            encoder_seq_length = encoder_seq_length * self.model_tester.num_hashes
+        # BEiT has a different seq_length
+        seq_len = self.model_tester.expected_seq_length
 
         for model_class in self.all_model_classes:
             inputs_dict["output_attentions"] = True
@@ -332,7 +322,7 @@ def test_attention_outputs(self):
             model.eval()
             with torch.no_grad():
                 outputs = model(**self._prepare_for_class(inputs_dict, model_class))
-            attentions = outputs.encoder_attentions if config.is_encoder_decoder else outputs.attentions
+            attentions = outputs.attentions
             self.assertEqual(len(attentions), self.model_tester.num_hidden_layers)
 
             # check that output_attentions also work using config
@@ -349,7 +339,7 @@ def test_attention_outputs(self):
 
             self.assertListEqual(
                 list(attentions[0].shape[-3:]),
-                [self.model_tester.num_attention_heads, encoder_seq_length, encoder_key_length],
+                [self.model_tester.num_attention_heads, seq_len, seq_len],
             )
             out_len = len(outputs)
 
@@ -369,7 +359,7 @@ def test_attention_outputs(self):
             self.assertEqual(len(self_attentions), self.model_tester.num_hidden_layers)
             self.assertListEqual(
                 list(self_attentions[0].shape[-3:]),
-                [self.model_tester.num_attention_heads, encoder_seq_length, encoder_key_length],
+                [self.model_tester.num_attention_heads, seq_len, seq_len],
             )
 
     def test_hidden_states_output(self):
@@ -381,18 +371,15 @@ def check_hidden_states_output(inputs_dict, config, model_class):
             with torch.no_grad():
                 outputs = model(**self._prepare_for_class(inputs_dict, model_class))
 
-            hidden_states = outputs.encoder_hidden_states if config.is_encoder_decoder else outputs.hidden_states
+            hidden_states = outputs.hidden_states
 
             expected_num_layers = getattr(
                 self.model_tester, "expected_num_hidden_layers", self.model_tester.num_hidden_layers + 1
             )
             self.assertEqual(len(hidden_states), expected_num_layers)
 
             # BEiT has a different seq_length
-            image_size = to_2tuple(self.model_tester.image_size)
-            patch_size = to_2tuple(self.model_tester.patch_size)
-            num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-            seq_length = num_patches + 1
+            seq_length = self.model_tester.expected_seq_length
 
             self.assertListEqual(
                 list(hidden_states[0].shape[-2:]),

tests/beit/test_modeling_flax_beit.py

@@ -75,6 +75,10 @@ def __init__(
         self.type_sequence_label_size = type_sequence_label_size
         self.initializer_range = initializer_range
 
+        # in BeiT, the expected seq_len equals the number of patches + 1 (we add 1 for the [CLS] token)
+        num_patches = (image_size // patch_size) ** 2
+        self.expected_seq_length = num_patches + 1
+
     def prepare_config_and_inputs(self):
         pixel_values = floats_tensor([self.batch_size, self.num_channels, self.image_size, self.image_size])
 
@@ -104,20 +108,14 @@ def create_and_check_model(self, config, pixel_values, labels):
 
         model = FlaxBeitModel(config=config)
         result = model(pixel_values)
-        # expected sequence length = num_patches + 1 (we add 1 for the [CLS] token)
-        image_size = (self.image_size, self.image_size)
-        patch_size = (self.patch_size, self.patch_size)
-        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-        self.parent.assertEqual(result.last_hidden_state.shape, (self.batch_size, num_patches + 1, self.hidden_size))
+        self.parent.assertEqual(
+            result.last_hidden_state.shape, (self.batch_size, self.expected_seq_length, self.hidden_size)
+        )
 
     def create_and_check_for_masked_lm(self, config, pixel_values, labels):
         model = FlaxBeitForMaskedImageModeling(config=config)
         result = model(pixel_values)
-        # expected sequence length = num_patches
-        image_size = (self.image_size, self.image_size)
-        patch_size = (self.patch_size, self.patch_size)
-        num_patches = (image_size[1] // patch_size[1]) * (image_size[0] // patch_size[0])
-        self.parent.assertEqual(result.logits.shape, (self.batch_size, num_patches, self.vocab_size))
+        self.parent.assertEqual(result.logits.shape, (self.batch_size, self.expected_seq_length - 1, self.vocab_size))
 
     def create_and_check_for_image_classification(self, config, pixel_values, labels):
         config.num_labels = self.type_sequence_label_size
@@ -151,13 +149,11 @@ def test_config(self):
         self.config_tester.run_common_tests()
 
     # We need to override this test because in Beit, the seq_len equals the number of patches + 1
-    # we compute that here
     def test_attention_outputs(self):
         config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
         config.return_dict = True
 
-        num_patches = (config.image_size // config.patch_size) ** 2
-        seq_length = num_patches + 1
+        seq_length = self.model_tester.expected_seq_length
 
         for model_class in self.all_model_classes:
             inputs_dict["output_attentions"] = True
@@ -209,7 +205,7 @@ def test_forward_signature(self):
             expected_arg_names = ["pixel_values"]
             self.assertListEqual(arg_names[:1], expected_arg_names)
 
-    # We neeed to override this test because Beit expects pixel_values instead of input_ids
+    # We need to override this test because Beit expects pixel_values instead of input_ids
     def test_jit_compilation(self):
         config, inputs_dict = self.model_tester.prepare_config_and_inputs_for_common()
 
@@ -234,12 +230,10 @@ def model_jitted(pixel_values, **kwargs):
                     self.assertEqual(jitted_output.shape, output.shape)
 
     # We need to override this test because in Beit, the seq_len equals the number of patches + 1
-    # we compute that here
     def test_hidden_states_output(self):
         def check_hidden_states_output(inputs_dict, config, model_class):
             model = model_class(config)
-            num_patches = (config.image_size // config.patch_size) ** 2
-            seq_length = num_patches + 1  # we add 1 for the [CLS] token
+            seq_length = self.model_tester.expected_seq_length
 
             outputs = model(**self._prepare_for_class(inputs_dict, model_class))
             hidden_states = outputs.hidden_states