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Cake is a Rust framework for distributed inference of large models like LLama3 based on Candle. The goal of the project is being able to run big (70B+) models by repurposing consumer hardware into an heterogeneous cluster of iOS, Android, macOS, Linux and Windows devices, effectively leveraging planned obsolescence as a tool to make AI more accessible and democratic.

⚠ This is experimental code that's being actively developed and changed very quickly, expect bugs ⚠

The idea is to shard the transformer blocks to multiple devices in order to be able to run the inference on models that wouldn't normally fit in the GPU memory of a single device. Inferences over contiguous transformer blocks on the same worker are batched in order to minimize latency due to data transfer.

CUDA >= 12.2 is required for CUDA accelerated systems.

With Rust installed, you can build the core library and the CLI utilities with:

cargo build --release

This will compile with the best available accelleration for the host system.

To generate the iOS bindings in the app that can then be compiled and deployed via XCode:

make ios

Run a worker node:

cake-cli --model /path/to/Meta-Llama-3-8B \ # model path, read below on how to optimize model size for workers
         --mode worker \                    # run as worker
         --name worker0 \                   # worker name in topology file
         --topology topology.yml \          # topology
         --address 0.0.0.0:10128            # bind address

Run a master node with an OpenAI compatible REST API:

cake-cli --model /path/to/Meta-Llama-3-8B \ # model path
         --api 0.0.0.0:8080               \ # API bind address
         --topology topology.yml            # topology file

Where topology.yml determines which layers are served by which worker (you can find a list of all the layers of a model in its tensor index file):

linux_server_1:
  host: 'linux_server.host:10128'
  description: 'NVIDIA Titan X Pascal (12GB)'
  layers:
    - 'model.layers.0-5'

linux_server_2:
  host: 'linux_server2.host:10128'
  description: 'NVIDIA GeForce 3080 (10GB)'
  layers:
    - 'model.layers.6-16'

iphone:
  host: 'iphone.host:10128'
  description: 'iPhone 15 Pro Max'
  layers:
    - 'model.layers.17'

ipad:
  host: 'ipad.host:10128'
  description: 'iPad'
  layers:
    - 'model.layers.18-19'

macbook:
  host: 'macbook.host:10128'
  description: 'M1 Max'
  layers:
    - 'model.layers.20-31' 

You can now interact with the cluster by:

curl http://master-ip:8080/api/v1/chat/completions \                                                                                                                           ~  
  -H "Content-Type: application/json" \
  -d '{
    "messages": [
        {   
            "role": "system",
            "content": "You are a helpful AI assistant."
        },  
        {   
            "role": "user",
            "content": "Why is the sky blue?"
        }
    ]
}'

As a memory and disk space optimization, you might want to give the worker only the data it actually needs from the model instead of the whole folder, in which case you can use the cake-split-model utility. For instance to generate a smaller version of the llama3 safetensors, you can:

cake-split-model --model-path path/to/Meta-Llama-3-8B \ # source model to split
                 --topology path/to/topology.yml \      # topology file
                 --output output-folder-name            # output folder where all the workers data bundles will be saved

This will create a smaller folder with only the required layers tensors and the topology file for the specific worker. Remember to also copy other model contents (config.json, tokenizer.json, etc) in the worker bundle before deploying it.

Released under the GPL 3 license. To see the licenses of the project dependencies, install cargo license with cargo install cargo-license and then run cargo license.