Update README.md

README.md

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-These are the weights for OLIVE trained with retrieval on the train 2017 split of the COCO dataset. For more details on training and usage, check out the github repository at https://github.com/tossowski/Olive.
+These are the weights for OLIVE trained with retrieval on the train 2017 split of the COCO dataset. The LLM decoder used is the huggingface instruction-tuned llama 2 checkpoint, and the vision encoder is a CLIP Vision Transformer with 14x14 patch size and 336 pixel resolution. For more details on training and usage, check out the github repository at https://github.com/tossowski/Olive.