Add `ChainEvaluator` to documentation #518

	name: Unix

	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8]

	steps:
	- uses: actions/checkout@v2
	- name: Cache conda
	uses: actions/cache@v2
	# Increase this value to reset cache
	env: {CACHE_NUMBER: 0}
	with:
	path: ~/conda_pkgs_dir
	key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ matrix.python-version }}

	- uses: conda-incubator/setup-miniconda@v2
	name: Setup conda
	with:
	auto-update-conda: true
	activate-environment: testing
	auto-activate-base: false
	channels: defaults
	channel-priority: true

	- shell: bash -l {0}
	name: Install dependencies
	run: \|
	conda install numpy pandas pytorch cpuonly -c pytorch
	conda install -c conda-forge mpi4py mpich
	pip install .[test]
	- shell: bash -l {0}
	name: Lint with flake8
	run: \|
	flake8 ./optimas
	flake8 ./examples --extend-ignore F821 --exclude custom_fld_diags.py,custom_ptcl_diags.py
	- shell: bash -l {0}
	name: Run unit tests with MPICH
	run: \|
	python -m pytest tests/
	- shell: bash -l {0}
	name: Replace MPICH with openMPI
	run: \|
	conda uninstall mpi4py mpich
	conda install -c conda-forge mpi4py openmpi
	- shell: bash -l {0}
	name: Run unit tests with openMPI
	run: \|
	rm -r tests_output
	python -m pytest tests/

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