MLOS

This repository contains a stripped down implementation of essentially just the core optimizer and config space description APIs from the original MLOS as well as the mlos-bench module intended to help automate and manage running experiments for autotuning systems with mlos-core.

It is intended to provide a simplified, easier to consume (e.g. via pip), with lower dependencies abstraction to

• describe a space of context, parameters, their ranges, constraints, etc. and result objectives
• an "optimizer" service abstraction (e.g. register() and suggest()) so we can easily swap out different implementations methods of searching (e.g. random, BO, etc.)
• provide some helpers for automating optimization experiment runner loops and data collection

For these design requirements we intend to reuse as much from existing OSS libraries as possible and layer policies and optimizations specifically geared towards autotuning over top.

Getting Started

The development environment for MLOS uses conda to ease dependency management.

Devcontainer

For a quick start, you can use the provided VSCode devcontainer configuration.

Simply open the project in VSCode and follow the prompts to build and open the devcontainer and the conda environment and additional tools will be installed automatically inside the container.

Manually

See Also: conda install instructions

Note: to support Windows we currently rely on some pre-compiled packages from conda-forge channels, which increases the conda solver time during environment create/update.

To work around this the (currently) experimental libmamba solver can be used.

See https://github.com/conda-incubator/conda-libmamba-solver#getting-started for more details.

0. Create the mlos Conda environment.

   conda env create -f conda-envs/mlos.yml

   See the conda-envs/ directory for additional conda environment files, including those used for Windows (e.g. mlos-windows.yml).

   or

   # This will also ensure the environment is update to date using "conda env update -f conda-envs/mlos.yml"
   make conda-env

   Note: the latter expects a *nix environment.

1. Initialize the shell environment.

   conda activate mlos

2. For an example of using the mlos_core optimizer APIs run the BayesianOptimization.ipynb notebook.

3. For an example of using the mlos_bench tool to run an experiment, see the mlos_bench Quickstart README.

   Here's a quick summary:

   # get an azure token
   ./scripts/generate-azure-credentials-config.sh
   
   # run a simple experiment
   mlos_bench --config ./mlos_bench/mlos_bench/config/cli/azure-redis-1shot.jsonc

   See Also: mlos_bench/config for additional configuration details.

Distributing

1. Build the wheel file(s)

   make dist

2. Install it (e.g. after copying it somewhere else).

   # this will install just the optimizer component with emukit support:
   pip install dist/mlos_core-0.1.0-py3-none-any.whl[emukit]
   
   # this will install just the optimizer component with skopt support:
   pip install dist/mlos_core-0.1.0-py3-none-any.whl[skopt]

   # this will install both the optimizer and the experiment runner:
   pip install dist/mlos_bench-0.1.0-py3-none-any.whl

   Note: exact versions may differ due to automatic versioning.

See Also

• API and Examples Documentation: https://aka.ms/mlos-core/docs
• Source Code Repository: https://aka.ms/mlos-core/src