[Model] Add support for Jina Embeddings V4

examples/offline_inference/embed_jina_embeddings_v4.py

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+"""
+Example of offline inference with Jina Embeddings V4 multimodal model.
+
+This example demonstrates:
+1. Text-only embeddings
+2. Image-only embeddings
+3. Cross-modal embeddings (text-to-image similarity)
+
+The model supports both text and vision inputs through a unified architecture.
+"""
+
+import torch
+
+from vllm import LLM
+from vllm.config import PoolerConfig
+from vllm.inputs.data import TextPrompt
+from vllm.multimodal.utils import fetch_image
+
+
+def get_embeddings(outputs):
+    """Extract and normalize embeddings from model outputs."""
+    VISION_START_TOKEN_ID, VISION_END_TOKEN_ID = 151652, 151653
+
+    embeddings = []
+    for output in outputs:
+        if VISION_START_TOKEN_ID in output.prompt_token_ids:
+            # For vision inputs, extract only vision token embeddings
+            img_start_pos = output.prompt_token_ids.index(VISION_START_TOKEN_ID)
+            img_end_pos = output.prompt_token_ids.index(VISION_END_TOKEN_ID)
+            embeddings_tensor = output.outputs.data.detach().clone()[
+                img_start_pos : img_end_pos + 1
+            ]
+        else:
+            # For text-only inputs, use all token embeddings
+            embeddings_tensor = output.outputs.data.detach().clone()
+
+        # Pool and normalize embeddings
+        pooled_output = embeddings_tensor.mean(dim=0, dtype=torch.float32)
+        embeddings.append(torch.nn.functional.normalize(pooled_output, dim=-1))
+    return embeddings
+
+
+def main():
+    # Initialize the model
+    model = LLM(
+        model="jinaai/jina-embeddings-v4-vllm-retrieval",
+        task="embed",
+        override_pooler_config=PoolerConfig(pooling_type="ALL", normalize=False),
+        dtype="float16",
+    )
+
+    # Example 1: Text-only embeddings
+    print("=== Text Embeddings ===")
+    query = "Overview of climate change impacts on coastal cities"
+    query_prompt = TextPrompt(prompt=f"Query: {query}")
+
+    passage = """The impacts of climate change on coastal cities are significant
+    and multifaceted. Rising sea levels threaten infrastructure, while increased
+    storm intensity poses risks to populations and economies."""
+    passage_prompt = TextPrompt(prompt=f"Passage: {passage}")
+
+    # Generate embeddings
+    text_outputs = model.encode([query_prompt, passage_prompt])
+    text_embeddings = get_embeddings(text_outputs)
+
+    # Calculate similarity
+    similarity = torch.dot(text_embeddings[0], text_embeddings[1]).item()
+    print(f"Query: {query[:50]}...")
+    print(f"Passage: {passage[:50]}...")
+    print(f"Similarity: {similarity:.4f}\n")
+
+    # Example 2: Image embeddings
+    print("=== Image Embeddings ===")
+    # Fetch sample images
+    image1_url = "https://raw.githubusercontent.com/jina-ai/multimodal-reranker-test/main/handelsblatt-preview.png"
+    image2_url = "https://raw.githubusercontent.com/jina-ai/multimodal-reranker-test/main/paper-11.png"
+
+    image1 = fetch_image(image1_url)
+    image2 = fetch_image(image2_url)
+
+    # Create image prompts with the required format
+    image1_prompt = TextPrompt(
+        prompt="<|im_start|>user\n<|vision_start|><|image_pad|>"
+        "<|vision_end|>Describe the image.<|im_end|>\n",
+        multi_modal_data={"image": image1},
+    )
+
+    image2_prompt = TextPrompt(
+        prompt="<|im_start|>user\n<|vision_start|><|image_pad|>"
+        "<|vision_end|>Describe the image.<|im_end|>\n",
+        multi_modal_data={"image": image2},
+    )
+
+    # Generate embeddings
+    image_outputs = model.encode([image1_prompt, image2_prompt])
+    image_embeddings = get_embeddings(image_outputs)
+
+    # Calculate similarity
+    similarity = torch.dot(image_embeddings[0], image_embeddings[1]).item()
+    print(f"Image 1: {image1_url.split('/')[-1]}")
+    print(f"Image 2: {image2_url.split('/')[-1]}")
+    print(f"Similarity: {similarity:.4f}\n")
+
+    # Example 3: Cross-modal similarity (text vs image)
+    print("=== Cross-modal Similarity ===")
+    query = "scientific paper with markdown formatting"
+    query_prompt = TextPrompt(prompt=f"Query: {query}")
+
+    # Generate embeddings for text query and second image
+    cross_outputs = model.encode([query_prompt, image2_prompt])
+    cross_embeddings = get_embeddings(cross_outputs)
+
+    # Calculate cross-modal similarity
+    similarity = torch.dot(cross_embeddings[0], cross_embeddings[1]).item()
+    print(f"Text query: {query}")
+    print(f"Image: {image2_url.split('/')[-1]}")
+    print(f"Cross-modal similarity: {similarity:.4f}")
+
+
+if __name__ == "__main__":
+    main()