[Grounding DINO] Add support for cross-attention in GroundingDinoMult…

…iHeadAttention (#30364)

* Added cross attention support

* Fixed dtypes

* Fixed assumption

* Moved to decoder

src/transformers/models/grounding_dino/modeling_grounding_dino.py

@@ -818,7 +818,7 @@ def forward(
             attention_masks = attention_masks[:, None, :, :]
             attention_masks = attention_masks.repeat(1, self.num_heads, 1, 1)
 
-            dtype = torch.float16
+            dtype = hidden_states.dtype
             attention_masks = attention_masks.to(dtype=dtype)  # fp16 compatibility
             attention_masks = (1.0 - attention_masks) * torch.finfo(dtype).min
 
@@ -1425,12 +1425,11 @@ def forward(
 
         # Cross-Attention Text
         queries = self.with_pos_embed(hidden_states, position_embeddings)
-
         hidden_states, text_cross_attn_weights = self.encoder_attn_text(
             queries=queries,
             keys=text_encoder_hidden_states,
             values=text_encoder_hidden_states,
-            # attention_mask=text_encoder_attention_mask, # TODO fix cross-attention mask here
+            attention_mask=text_encoder_attention_mask,
             output_attentions=True,
         )
 
@@ -1893,6 +1892,16 @@ def forward(
         intermediate = ()
         intermediate_reference_points = ()
 
+        if text_encoder_attention_mask is not None:
+            dtype = text_encoder_hidden_states.dtype
+
+            text_encoder_attention_mask = text_encoder_attention_mask[:, None, None, :]
+            text_encoder_attention_mask = text_encoder_attention_mask.repeat(
+                1, self.config.decoder_attention_heads, self.config.num_queries, 1
+            )
+            text_encoder_attention_mask = text_encoder_attention_mask.to(dtype=dtype)
+            text_encoder_attention_mask = text_encoder_attention_mask * torch.finfo(dtype).min
+
         for idx, decoder_layer in enumerate(self.layers):
             num_coordinates = reference_points.shape[-1]
             if num_coordinates == 4:

tests/models/grounding_dino/test_modeling_grounding_dino.py

@@ -687,3 +687,29 @@ def test_inference_object_detection_head_equivalence_cpu_gpu(self):
 
         self.assertTrue(torch.allclose(results_cpu["scores"], result_gpu["scores"].cpu(), atol=1e-3))
         self.assertTrue(torch.allclose(results_cpu["boxes"], result_gpu["boxes"].cpu(), atol=1e-3))
+
+    def test_cross_attention_mask(self):
+        model = GroundingDinoForObjectDetection.from_pretrained("IDEA-Research/grounding-dino-tiny").to(torch_device)
+
+        processor = self.default_processor
+        image = prepare_img()
+        text1 = "a cat."
+        text2 = "a remote control."
+        text_batched = [text1, text2]
+
+        encoding1 = processor(images=image, text=text1, return_tensors="pt").to(torch_device)
+        encoding2 = processor(images=image, text=text2, return_tensors="pt").to(torch_device)
+        # If we batch the text and cross attention masking is working the batched result should be equal to
+        # The singe text result
+        encoding_batched = processor(
+            images=[image] * len(text_batched), text=text_batched, padding="longest", return_tensors="pt"
+        ).to(torch_device)
+
+        with torch.no_grad():
+            outputs1 = model(**encoding1)
+            outputs2 = model(**encoding2)
+            outputs_batched = model(**encoding_batched)
+
+        self.assertTrue(torch.allclose(outputs1.logits, outputs_batched.logits[:1], atol=1e-3))
+        # For some reason 12 elements are > 1e-3, but the rest are fine
+        self.assertTrue(torch.allclose(outputs2.logits, outputs_batched.logits[1:], atol=1.8e-3))