Traditional text embedding models, such as jina-embeddings-v2-base-en, excel in text-to-text retrieval but incapable of cross-modal tasks. Models like openai/clip-vit-base-patch32 effectively align image and text embeddings but are not optimized for text-to-text retrieval due to their training methodologies and context limitations.

jina-clip-v1 bridges this gap by offering robust performance in both domains. Its text component matches the retrieval efficiency of jina-embeddings-v2-base-en, while its overall architecture sets a new benchmark for cross-modal retrieval. This dual capability makes it an excellent tool for multimodal retrieval-augmented generation (MuRAG) applications, enabling seamless text-to-text and text-to-image searches within a single model.

Data & Parameters

Check out our paper

Usage

The easiest way to starting using jina-clip-v1-en is to use Jina AI's Embeddings API.
Alternatively, you can use Jina CLIP directly via transformers/sentence-transformers package.

python

!pip install transformers einops timm pillow
from transformers import AutoModel

# Initialize the model
model = AutoModel.from_pretrained('jinaai/jina-clip-v1', trust_remote_code=True)

# New meaningful sentences
sentences = ['A blue cat', 'A red cat']

# Public image URLs
image_urls = [
    'https://i.pinimg.com/600x315/21/48/7e/21487e8e0970dd366dafaed6ab25d8d8.jpg',
    'https://i.pinimg.com/736x/c9/f2/3e/c9f23e212529f13f19bad5602d84b78b.jpg'
]

# Encode text and images
text_embeddings = model.encode_text(sentences)
image_embeddings = model.encode_image(image_urls)  # also accepts PIL.image, local filenames, dataURI

# Compute similarities
print(text_embeddings[0] @ text_embeddings[1].T) # text embedding similarity
print(text_embeddings[0] @ image_embeddings[0].T) # text-image cross-modal similarity
print(text_embeddings[0] @ image_embeddings[1].T) # text-image cross-modal similarity
print(text_embeddings[1] @ image_embeddings[0].T) # text-image cross-modal similarity
print(text_embeddings[1] @ image_embeddings[1].T)# text-image cross-modal similarity

or sentence-transformers:

python

# !pip install -U sentence-transformers 
from sentence_transformers import SentenceTransformer

# Initialize the model
model = SentenceTransformer('jinaai/jina-clip-v1', trust_remote_code=True)

# New meaningful sentences
sentences = ['A blue cat', 'A red cat']

# Public image URLs
image_urls = [
    'https://i.pinimg.com/600x315/21/48/7e/21487e8e0970dd366dafaed6ab25d8d8.jpg',
    'https://i.pinimg.com/736x/c9/f2/3e/c9f23e212529f13f19bad5602d84b78b.jpg'
]

text_embeddings = model.encode(sentences)
image_embeddings = model.encode(image_urls)

JavaScript developers can use Jina CLIP via the Transformers.js library. Note that to use this model, you need to install Transformers.js v3 from source using npm install xenova/transformers.js#v3.

import { AutoTokenizer, CLIPTextModelWithProjection, AutoProcessor, CLIPVisionModelWithProjection, RawImage, cos_sim } from '@xenova/transformers';

// Load tokenizer and text model
const tokenizer = await AutoTokenizer.from_pretrained('jinaai/jina-clip-v1');
const text_model = await CLIPTextModelWithProjection.from_pretrained('jinaai/jina-clip-v1');

// Load processor and vision model
const processor = await AutoProcessor.from_pretrained('Xenova/clip-vit-base-patch32');
const vision_model = await CLIPVisionModelWithProjection.from_pretrained('jinaai/jina-clip-v1');

// Run tokenization
const texts = ['A blue cat', 'A red cat'];
const text_inputs = tokenizer(texts, { padding: true, truncation: true });

// Compute text embeddings
const { text_embeds } = await text_model(text_inputs);

// Read images and run processor
const urls = [
    'https://i.pinimg.com/600x315/21/48/7e/21487e8e0970dd366dafaed6ab25d8d8.jpg',
    'https://i.pinimg.com/736x/c9/f2/3e/c9f23e212529f13f19bad5602d84b78b.jpg'
];
const image = await Promise.all(urls.map(url => RawImage.read(url)));
const image_inputs = await processor(image);

// Compute vision embeddings
const { image_embeds } = await vision_model(image_inputs);

//  Compute similarities
console.log(cos_sim(text_embeds[0].data, text_embeds[1].data)) // text embedding similarity
console.log(cos_sim(text_embeds[0].data, image_embeds[0].data)) // text-image cross-modal similarity
console.log(cos_sim(text_embeds[0].data, image_embeds[1].data)) // text-image cross-modal similarity
console.log(cos_sim(text_embeds[1].data, image_embeds[0].data)) // text-image cross-modal similarity
console.log(cos_sim(text_embeds[1].data, image_embeds[1].data)) // text-image cross-modal similarity

Performance

Text-Image Retrieval

Name	Flickr Image Retr. R@1	Flickr Image Retr. R@5	Flickr Text Retr. R@1	Flickr Text Retr. R@5
ViT-B-32	0.597	0.8398	0.781	0.938
ViT-B-16	0.6216	0.8572	0.822	0.966
jina-clip	0.6748	0.8902	0.811	0.965

Name	MSCOCO Image Retr. R@1	MSCOCO Image Retr. R@5	MSCOCO Text Retr. R@1	MSCOCO Text Retr. R@5
ViT-B-32	0.342	0.6001	0.5234	0.7634
ViT-B-16	0.3309	0.5842	0.5242	0.767
jina-clip	0.4111	0.6644	0.5544	0.7904

Text-Text Retrieval

Name	STS12	STS15	STS17	STS13	STS14	STS16	STS22	STSBenchmark	SummEval
jina-embeddings-v2	0.7427	0.8755	0.8888	0.833	0.7917	0.836	0.6346	0.8404	0.3056
jina-clip	0.7352	0.8746	0.8976	0.8323	0.7868	0.8377	0.6583	0.8493	0.3048

Name	ArguAna	FiQA2018	NFCorpus	Quora	SCIDOCS	SciFact	TRECCOVID
jina-embeddings-v2	0.4418	0.4158	0.3245	0.882	0.1986	0.6668	0.6591
jina-clip	0.4933	0.3827	0.3352	0.8789	0.2024	0.6734	0.7161

Contact

Join our Discord community and chat with other community members about ideas.

Citation

If you find jina-clip-v1 useful in your research, please cite the following paper:

bibtex

@misc{2405.20204,
    Author = {Andreas Koukounas and Georgios Mastrapas and Michael Günther and Bo Wang and Scott Martens and Isabelle Mohr and Saba Sturua and Mohammad Kalim Akram and Joan Fontanals Martínez and Saahil Ognawala and Susana Guzman and Maximilian Werk and Nan Wang and Han Xiao},
    Title = {Jina CLIP: Your CLIP Model Is Also Your Text Retriever},
    Year = {2024},
    Eprint = {arXiv:2405.20204},
}

FAQ

I encounter this problem, what should I do?

ValueError: The model class you are passing has a `config_class` attribute that is not consistent with the config class you passed (model has <class 'transformers_modules.jinaai.jina-clip-implementation.7f069e2d54d609ef1ad2eb578c7bf07b5a51de41.configuration_clip.JinaCLIPConfig'> and you passed <class 'transformers_modules.jinaai.jina-clip-implementation.7f069e2d54d609ef1ad2eb578c7bf07b5a51de41.configuration_cli.JinaCLIPConfig'>. Fix one of those so they match!

There was a bug in Transformers library between 4.40.x to 4.41.1. You can update transformers to >4.41.2 or <=4.40.0

Given one query, how can I merge its text-text and text-image cosine similarity?

Our emperical study shows that text-text cosine similarity is normally larger than text-image cosine similarity! If you want to merge two scores, we recommended 2 ways:

weighted average of text-text sim and text-image sim:

combined_scores = sim(text, text) + lambda * sim(text, image)  # optimal lambda depends on your dataset, but in general lambda=2 can be a good choice.

apply z-score normalization before merging scores:

python

# pseudo code
query_document_mean = np.mean(cos_sim_text_texts)
query_document_std = np.std(cos_sim_text_texts)
text_image_mean = np.mean(cos_sim_text_images)
text_image_std = np.std(cos_sim_text_images)

query_document_sim_normalized = (cos_sim_query_documents - query_document_mean) / query_document_std
text_image_sim_normalized = (cos_sim_text_images - text_image_mean) / text_image_std