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--- |
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language: en |
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license: mit |
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tags: |
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- vision |
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- image-to-text |
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pipeline_tag: image-to-text |
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--- |
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# BLIP-2, OPT-2.7b, pre-trained only |
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BLIP-2 model, leveraging [OPT-2.7b](https://huggingface.co/facebook/opt-2.7b) (a large language model with 2.7 billion parameters). |
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It was introduced in the paper [BLIP-2: Bootstrapping Language-Image Pre-training with Frozen Image Encoders and Large Language Models](https://arxiv.org/abs/2301.12597) by Li et al. and first released in [this repository](https://github.com/salesforce/LAVIS/tree/main/projects/blip2). |
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Disclaimer: The team releasing BLIP-2 did not write a model card for this model so this model card has been written by the Hugging Face team. |
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## Model description |
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BLIP-2 consists of 3 models: a CLIP-like image encoder, a Querying Transformer (Q-Former) and a large language model. |
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The authors initialize the weights of the image encoder and large language model from pre-trained checkpoints and keep them frozen |
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while training the Querying Transformer, which is a BERT-like Transformer encoder that maps a set of "query tokens" to query embeddings, |
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which bridge the gap between the embedding space of the image encoder and the large language model. |
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The goal for the model is simply to predict the next text token, giving the query embeddings and the previous text. |
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<img src="https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/transformers/model_doc/blip2_architecture.jpg" |
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alt="drawing" width="600"/> |
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This allows the model to be used for tasks like: |
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- image captioning |
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- visual question answering (VQA) |
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- chat-like conversations by feeding the image and the previous conversation as prompt to the model |
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## Intended uses & limitations |
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You can use the raw model for conditional text generation given an image and optional text. See the [model hub](https://huggingface.co/models?search=Salesforce/blip) to look for |
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fine-tuned versions on a task that interests you. |
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### How to use |
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For code examples, we refer to the [documentation](https://huggingface.co/docs/transformers/main/en/model_doc/blip-2#transformers.Blip2ForConditionalGeneration.forward.example). |
