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Update multi-modal multi-vector template README.md (#14992)

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# rag-chroma-multi-modal-multi-vector # rag-chroma-multi-modal-multi-vector
Multi-modal LLMs enable text-to-image retrieval and question-answering over images. Multi-modal LLMs enable visual assistants that can perform question-answering about images.
You can ask questions in natural language about a collection of photos, retrieve relevant ones, and have a multi-modal LLM answer questions about the retrieved images. This template create a visual assistant for slide decks, which often contain visuals such as graphs or figures.
This template performs text-to-image retrieval for question-answering about a slide deck, which often contains visual elements that are not captured in standard RAG. It uses GPT-4V to create image summaries for each slide, embeds the summaries, and stores them in Chroma.
This will use GPT-4V for image captioning and answer synthesis. Given a question, relevat slides are retrieved and passed to GPT-4V for answer synthesis.
![mm-captioning](https://github.com/langchain-ai/langchain/assets/122662504/5277ef6b-d637-43c7-8dc1-9b1567470503)
## Input ## Input