add generate_second_order_model method with unit test #517

	# Inspired by https://github.com/pyg-team/pytorch_geometric/blob/ee30973ed0957a7f29f345d4eeaf9cfd70805109/.github/workflows/linting.yml
	name: Linting

	on:
	push:
	branches:
	- main
	pull_request:

	jobs:
	pylint: # linter: tool that checks for errors in Python code, tries to enforce a coding standard and looks for bad code smells
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Setup packages
	uses: ./.github/actions/setup
	with:
	full_install: false

	- name: Install dependencies
	run: pip install pylint

	- name: Run linting
	continue-on-error: true
	run: pylint $(git ls-files '*.py')

	flake8: # Another linter: Mostly checks if code is PEP8 conform but has some additional plugins.
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.10.13" # As in docker image (pytorch/pytorch:2.1.0-cuda12.1-cudnn8-runtime) used as dev container

	- name: Install dependencies
	run: pip install flake8 flake8-pyproject flake8-bugbear

	- name: Run linting
	continue-on-error: true
	run: flake8 $(git ls-files '*.py')

	mypy: # stricter static type checker
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4

	- name: Setup packages
	uses: ./.github/actions/setup
	with:
	full_install: false

	- name: Install dependencies
	run: pip install mypy

	- name: Check type hints
	continue-on-error: true
	run: \|
	mypy src/pathpyG

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