Add Vicuna example folder. (skypilot-org#1826)

* Vicuna examples.

* Updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

* updates

Author: concretevitamin

README.md

@@ -25,6 +25,13 @@
     Run jobs on any cloud, easily and cost effectively
 </h3>
 
+----
+:fire: :dromedary_camel: *News (March, 2023)* :dromedary_camel: :fire: 
+
+- **[Vicuna LLM chatbot](https://vicuna.lmsys.org/) trained** [**using SkyPilot**](./examples/vicuna-llm/) **for $300 on spot instances!** 
+- *Serve* your own LLaMA LLM chatbot (not finetuned) on any cloud: [**example**](./examples/llama-llm-chatbots/), [**repo**](https://github.com/skypilot-org/sky-llama)
+----
+
 SkyPilot is a framework for easily and cost effectively running ML workloads[^1] on any cloud. 
 
 SkyPilot abstracts away the cloud infra burden:

examples/vicuna-llm/README.md

@@ -0,0 +1,57 @@
+# Vicuna: An LLM Chatbot Impressing GPT-4 with 90% ChatGPT Quality
+
+<img src="https://vicuna.lmsys.org/favicon.jpeg" width="25%" alt="Vicuna LLM"/>
+
+Vicuna is an LLM chatbot with impressive quality. It is trained using SkyPilot on [cloud spot instances](https://skypilot.readthedocs.io/en/latest/examples/spot-jobs.html), with a cost of ~$300.
+
+* [Blog post](https://vicuna.lmsys.org/)
+* [Demo](https://chat.lmsys.org/)
+* [Repo](https://github.com/lm-sys/FastChat)
+
+## Prerequisites
+Install the latest SkyPilot:
+```bash
+pip install git+https://github.com/skypilot-org/skypilot.git
+sky check
+```
+Clone the Vicuna repo to get the [SkyPilot YAMLs](https://github.com/lm-sys/FastChat/tree/main/scripts) for finetuning:
+```bash
+git clone https://github.com/lm-sys/FastChat.git
+cd FastChat
+```
+
+## Training Vicuna with SkyPilot
+Currently, training requires GPUs with 80GB memory.  See `sky show-gpus --all` for supported GPUs.
+
+**To train on 8 A100 GPUs (80GB memory) using spot instances**:
+```bash
+# Launch it on managed spot to save 3x cost
+sky spot launch -n vicuna scripts/train-vicuna.yaml --env WANDB_API_KEY
+
+# Train a 7B model instead of the default 13B
+sky spot launch -n vicuna-7b scripts/train-vicuna.yaml --env WANDB_API_KEY --env MODEL_SIZE=7
+
+# Use *unmanaged* spot instances (i.e., preemptions won't get auto-recovered).
+# Unmanaged spot saves the cost of a small controller VM.  We recommend using managed spot as above.
+sky launch -n vicunab scripts/train-vicuna.yaml --env WANDB_API_KEY
+```
+Currently, such `A100-80GB:8` spot instances are only available on GCP.
+
+**To use on-demand `A100-80GB:8` instances**, which are currently available on Lambda Cloud, Azure, and GCP:
+```bash
+sky launch -c vicuna -s scripts/train-vicuna.yaml --env WANDB_API_KEY --no-use-spot
+```
+
+
+## Q&A
+
+Q: I see some bucket permission errors `sky.exceptions.StorageBucketGetError` when running the above:
+```
+...
+sky.exceptions.StorageBucketGetError: Failed to connect to an existing bucket 'model-weights'.
+Please check if:
+  1. the bucket name is taken and/or
+  2. the bucket permissions are not setup correctly. To debug, consider using gsutil ls gs://model-weights.
+```
+
+A: The YAML files hard-coded names for existing buckets which are not public. Replace those bucket names (see `# Change to your own bucket`) with some unique names, and rerun the commands. New private buckets will be automatically created under your cloud account.