[image-to-text pipeline] Add conditional text support + GIT (#23362)

* First draft

* Remove print statements

* Add conditional generation

* Add more tests

* Remove scripts

* Remove BLIP specific linkes

* Add support for pix2struct

* Add fast test

* Address comment

* Fix style

src/transformers/models/auto/modeling_auto.py

@@ -529,6 +529,8 @@
     [
         ("blip", "BlipForConditionalGeneration"),
         ("blip-2", "Blip2ForConditionalGeneration"),
+        ("git", "GitForCausalLM"),
+        ("pix2struct", "Pix2StructForConditionalGeneration"),
         ("vision-encoder-decoder", "VisionEncoderDecoderModel"),
     ]
 )

src/transformers/pipelines/image_to_text.py

@@ -20,6 +20,8 @@
     from ..models.auto.modeling_tf_auto import TF_MODEL_FOR_VISION_2_SEQ_MAPPING
 
 if is_torch_available():
+    import torch
+
     from ..models.auto.modeling_auto import MODEL_FOR_VISION_2_SEQ_MAPPING
 
 logger = logging.get_logger(__name__)
@@ -56,8 +58,13 @@ def __init__(self, *args, **kwargs):
             TF_MODEL_FOR_VISION_2_SEQ_MAPPING if self.framework == "tf" else MODEL_FOR_VISION_2_SEQ_MAPPING
         )
 
-    def _sanitize_parameters(self, max_new_tokens=None, generate_kwargs=None):
+    def _sanitize_parameters(self, max_new_tokens=None, generate_kwargs=None, prompt=None):
         forward_kwargs = {}
+        preprocess_params = {}
+
+        if prompt is not None:
+            preprocess_params["prompt"] = prompt
+
         if generate_kwargs is not None:
             forward_kwargs["generate_kwargs"] = generate_kwargs
         if max_new_tokens is not None:
@@ -69,7 +76,7 @@ def _sanitize_parameters(self, max_new_tokens=None, generate_kwargs=None):
                     " please use only one"
                 )
             forward_kwargs["generate_kwargs"]["max_new_tokens"] = max_new_tokens
-        return {}, forward_kwargs, {}
+        return preprocess_params, forward_kwargs, {}
 
     def __call__(self, images: Union[str, List[str], "Image.Image", List["Image.Image"]], **kwargs):
         """
@@ -98,9 +105,43 @@ def __call__(self, images: Union[str, List[str], "Image.Image", List["Image.Imag
         """
         return super().__call__(images, **kwargs)
 
-    def preprocess(self, image):
+    def preprocess(self, image, prompt=None):
         image = load_image(image)
-        model_inputs = self.image_processor(images=image, return_tensors=self.framework)
+
+        if prompt is not None:
+            if not isinstance(prompt, str):
+                raise ValueError(
+                    f"Received an invalid text input, got - {type(prompt)} - but expected a single string. "
+                    "Note also that one single text can be provided for conditional image to text generation."
+                )
+
+            model_type = self.model.config.model_type
+
+            if model_type == "git":
+                model_inputs = self.image_processor(images=image, return_tensors=self.framework)
+                input_ids = self.tokenizer(text=prompt, add_special_tokens=False).input_ids
+                input_ids = [self.tokenizer.cls_token_id] + input_ids
+                input_ids = torch.tensor(input_ids).unsqueeze(0)
+                model_inputs.update({"input_ids": input_ids})
+
+            elif model_type == "pix2struct":
+                model_inputs = self.image_processor(images=image, header_text=prompt, return_tensors=self.framework)
+
+            elif model_type != "vision-encoder-decoder":
+                # vision-encoder-decoder does not support conditional generation
+                model_inputs = self.image_processor(images=image, return_tensors=self.framework)
+                text_inputs = self.tokenizer(prompt, return_tensors=self.framework)
+                model_inputs.update(text_inputs)
+
+            else:
+                raise ValueError(f"Model type {model_type} does not support conditional text generation")
+
+        else:
+            model_inputs = self.image_processor(images=image, return_tensors=self.framework)
+
+        if self.model.config.model_type == "git" and prompt is None:
+            model_inputs["input_ids"] = None
+
         return model_inputs
 
     def _forward(self, model_inputs, generate_kwargs=None):

tests/pipelines/test_pipelines_image_to_text.py

@@ -14,6 +14,8 @@
 
 import unittest
 
+import requests
+
 from transformers import MODEL_FOR_VISION_2_SEQ_MAPPING, TF_MODEL_FOR_VISION_2_SEQ_MAPPING, is_vision_available
 from transformers.pipelines import pipeline
 from transformers.testing_utils import is_pipeline_test, require_tf, require_torch, require_vision, slow
@@ -125,6 +127,15 @@ def test_small_model_pt(self):
             ],
         )
 
+    @require_torch
+    def test_small_model_pt_conditional(self):
+        pipe = pipeline("image-to-text", model="hf-internal-testing/tiny-random-BlipForConditionalGeneration")
+        image = "./tests/fixtures/tests_samples/COCO/000000039769.png"
+        prompt = "a photo of"
+
+        outputs = pipe(image, prompt=prompt)
+        self.assertTrue(outputs[0]["generated_text"].startswith(prompt))
+
     @slow
     @require_torch
     def test_large_model_pt(self):
@@ -143,6 +154,71 @@ def test_large_model_pt(self):
             ],
         )
 
+    @slow
+    @require_torch
+    def test_generation_pt_blip(self):
+        pipe = pipeline("image-to-text", model="Salesforce/blip-image-captioning-base")
+        url = "https://huggingface.co/datasets/sayakpaul/sample-datasets/resolve/main/pokemon.png"
+        image = Image.open(requests.get(url, stream=True).raw)
+
+        outputs = pipe(image)
+        self.assertEqual(outputs, [{"generated_text": "a pink pokemon pokemon with a blue shirt and a blue shirt"}])
+
+    @slow
+    @require_torch
+    def test_generation_pt_git(self):
+        pipe = pipeline("image-to-text", model="microsoft/git-base-coco")
+        url = "https://huggingface.co/datasets/sayakpaul/sample-datasets/resolve/main/pokemon.png"
+        image = Image.open(requests.get(url, stream=True).raw)
+
+        outputs = pipe(image)
+        self.assertEqual(outputs, [{"generated_text": "a cartoon of a purple character."}])
+
+    @slow
+    @require_torch
+    def test_conditional_generation_pt_blip(self):
+        pipe = pipeline("image-to-text", model="Salesforce/blip-image-captioning-base")
+        url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/ai2d-demo.jpg"
+        image = Image.open(requests.get(url, stream=True).raw)
+
+        prompt = "a photography of"
+
+        outputs = pipe(image, prompt=prompt)
+        self.assertEqual(outputs, [{"generated_text": "a photography of a volcano"}])
+
+        with self.assertRaises(ValueError):
+            outputs = pipe([image, image], prompt=[prompt, prompt])
+
+    @slow
+    @require_torch
+    def test_conditional_generation_pt_git(self):
+        pipe = pipeline("image-to-text", model="microsoft/git-base-coco")
+        url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/ai2d-demo.jpg"
+        image = Image.open(requests.get(url, stream=True).raw)
+
+        prompt = "a photo of a"
+
+        outputs = pipe(image, prompt=prompt)
+        self.assertEqual(outputs, [{"generated_text": "a photo of a tent with a tent and a tent in the background."}])
+
+        with self.assertRaises(ValueError):
+            outputs = pipe([image, image], prompt=[prompt, prompt])
+
+    @slow
+    @require_torch
+    def test_conditional_generation_pt_pix2struct(self):
+        pipe = pipeline("image-to-text", model="google/pix2struct-ai2d-base")
+        url = "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/tasks/ai2d-demo.jpg"
+        image = Image.open(requests.get(url, stream=True).raw)
+
+        prompt = "What does the label 15 represent? (1) lava (2) core (3) tunnel (4) ash cloud"
+
+        outputs = pipe(image, prompt=prompt)
+        self.assertEqual(outputs, [{"generated_text": "ash cloud"}])
+
+        with self.assertRaises(ValueError):
+            outputs = pipe([image, image], prompt=[prompt, prompt])
+
     @slow
     @require_tf
     def test_large_model_tf(self):