Add Blip2 model in VQA pipeline (#25532)

* Add Blip2 model in VQA pipeline

* use require_torch_gpu for test_large_model_pt_blip2

* use can_generate in vqa pipeline

* test Blip2ForConditionalGeneration using float16

* remove custom can_generate from Blip2ForConditionalGeneration

src/transformers/models/auto/modeling_auto.py

@@ -839,6 +839,7 @@ MODEL_FOR_TABLE_QUESTION_ANSWERING_MAPPING_NAMES = OrderedDict(
 
 MODEL_FOR_VISUAL_QUESTION_ANSWERING_MAPPING_NAMES = OrderedDict(
     [
+        ("blip-2", "Blip2ForConditionalGeneration"),
         ("vilt", "ViltForQuestionAnswering"),
     ]
 )

src/transformers/pipelines/visual_question_answering.py

@@ -124,10 +124,19 @@ class VisualQuestionAnsweringPipeline(Pipeline):
         return model_inputs
 
     def _forward(self, model_inputs):
+        if self.model.can_generate():
+            model_outputs = self.model.generate(**model_inputs)
+        else:
             model_outputs = self.model(**model_inputs)
         return model_outputs
 
     def postprocess(self, model_outputs, top_k=5):
+        if self.model.can_generate():
+            return [
+                {"answer": self.tokenizer.decode(output_ids, skip_special_tokens=True).strip()}
+                for output_ids in model_outputs
+            ]
+        else:
             if top_k > self.model.config.num_labels:
                 top_k = self.model.config.num_labels
 

tests/pipelines/test_pipelines_visual_question_answering.py

@@ -18,9 +18,11 @@ from transformers import MODEL_FOR_VISUAL_QUESTION_ANSWERING_MAPPING, is_vision_
 from transformers.pipelines import pipeline
 from transformers.testing_utils import (
     is_pipeline_test,
+    is_torch_available,
     nested_simplify,
     require_tf,
     require_torch,
+    require_torch_gpu,
     require_vision,
     slow,
 )
@@ -28,6 +30,10 @@ from transformers.testing_utils import (
 from .test_pipelines_common import ANY
 
 
+if is_torch_available():
+    import torch
+
+
 if is_vision_available():
     from PIL import Image
 else:
@@ -84,6 +90,37 @@ class VisualQuestionAnsweringPipelineTests(unittest.TestCase):
             outputs, [{"score": ANY(float), "answer": ANY(str)}, {"score": ANY(float), "answer": ANY(str)}]
         )
 
+    @require_torch
+    @require_torch_gpu
+    def test_small_model_pt_blip2(self):
+        vqa_pipeline = pipeline(
+            "visual-question-answering", model="hf-internal-testing/tiny-random-Blip2ForConditionalGeneration"
+        )
+        image = "./tests/fixtures/tests_samples/COCO/000000039769.png"
+        question = "How many cats are there?"
+
+        outputs = vqa_pipeline(image=image, question=question)
+        self.assertEqual(outputs, [{"answer": ANY(str)}])
+
+        outputs = vqa_pipeline({"image": image, "question": question})
+        self.assertEqual(outputs, [{"answer": ANY(str)}])
+
+        outputs = vqa_pipeline([{"image": image, "question": question}, {"image": image, "question": question}])
+        self.assertEqual(outputs, [[{"answer": ANY(str)}]] * 2)
+
+        vqa_pipeline = pipeline(
+            "visual-question-answering",
+            model="hf-internal-testing/tiny-random-Blip2ForConditionalGeneration",
+            model_kwargs={"torch_dtype": torch.float16},
+            device=0,
+        )
+        self.assertEqual(vqa_pipeline.model.device, torch.device(0))
+        self.assertEqual(vqa_pipeline.model.language_model.dtype, torch.float16)
+        self.assertEqual(vqa_pipeline.model.vision_model.dtype, torch.float16)
+
+        outputs = vqa_pipeline(image=image, question=question)
+        self.assertEqual(outputs, [{"answer": ANY(str)}])
+
     @slow
     @require_torch
     def test_large_model_pt(self):
@@ -109,6 +146,31 @@ class VisualQuestionAnsweringPipelineTests(unittest.TestCase):
             [[{"score": 0.8799, "answer": "2"}, {"score": 0.296, "answer": "1"}]] * 2,
         )
 
+    @slow
+    @require_torch
+    @require_torch_gpu
+    def test_large_model_pt_blip2(self):
+        vqa_pipeline = pipeline(
+            "visual-question-answering",
+            model="Salesforce/blip2-opt-2.7b",
+            model_kwargs={"torch_dtype": torch.float16},
+            device=0,
+        )
+        self.assertEqual(vqa_pipeline.model.device, torch.device(0))
+        self.assertEqual(vqa_pipeline.model.language_model.dtype, torch.float16)
+
+        image = "./tests/fixtures/tests_samples/COCO/000000039769.png"
+        question = "Question: how many cats are there? Answer:"
+
+        outputs = vqa_pipeline(image=image, question=question)
+        self.assertEqual(outputs, [{"answer": "two"}])
+
+        outputs = vqa_pipeline({"image": image, "question": question})
+        self.assertEqual(outputs, [{"answer": "two"}])
+
+        outputs = vqa_pipeline([{"image": image, "question": question}, {"image": image, "question": question}])
+        self.assertEqual(outputs, [[{"answer": "two"}]] * 2)
+
     @require_tf
     @unittest.skip("Visual question answering not implemented in TF")
     def test_small_model_tf(self):