[Demos] Adding OctoAI API Examples (Hosted Llama solution)

README.md

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 # Llama 2 Fine-tuning / Inference Recipes, Examples, Benchmarks and Demo Apps
 
+**[Update Feb. 26, 2024] We added examples to showcase OctoAI's cloud APIs for Llama2, CodeLlama, and LlamaGuard: including [PurpleLlama overview](./examples/Purple_Llama_OctoAI.ipynb), [hello Llama2 cloud](./demo_apps/OctoAI_API_examples/HelloLlamaCloud.ipynb), [getting to know Llama2](./demo_apps/OctoAI_API_examples/Getting_to_know_Llama.ipynb), [live search example](./demo_apps/OctoAI_API_examples/LiveData.ipynb), [Llama2 Gradio demo](./demo_apps/OctoAI_API_examples/Llama2_Gradio.ipynb), [Youtube video summarization](./demo_apps/OctoAI_API_examples/VideoSummary.ipynb), and [retrieval augmented generation overview](./demo_apps/OctoAI_API_examples/RAG_Chatbot_example/RAG_Chatbot_Example.ipynb)**.
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 **[Update Feb. 5, 2024] We added support for Code Llama 70B instruct in our example [inference script](./examples/code_llama/code_instruct_example.py). For details on formatting the prompt for Code Llama 70B instruct model please refer to [this document](./docs/inference.md)**.
 
 **[Update Dec. 28, 2023] We added support for Llama Guard as a safety checker for our example inference script and also with standalone inference with an example script and prompt formatting. More details [here](./examples/llama_guard/README.md). For details on formatting data for fine tuning Llama Guard, we provide a script and sample usage [here](./src/llama_recipes/data/llama_guard/README.md).**