fixed typo in gradient of cost function #83

	name: Run Notebooks

	on:
	push:
	branches:
	- master # Change this to the repository's main branch
	pull_request:
	branches:
	- master
	schedule:
	- cron: "0 0 * * 0" # Run every Sunday at midnight UTC (4 week interval)

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.10", "3.11", "3.12"]

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

	- name: Setup node
	uses: actions/setup-node@v4

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}

	# Testing matrix by printing the current Python version:
	- name: Display Python version
	run: python -c "import sys; print(sys.version)"

	- name: Install dependencies
	run: pip install jupyter nbconvert
	- run: pip install -r requirements.txt
	- run: pip install -r ci/requirements.txt

	- name: Install PortAudio library
	run: sudo apt-get install libportaudio2
	- run: sudo apt-get install libasound-dev

	- name: Find notebooks
	id: find-notebooks
	run: \|
	find . -name "*.ipynb" -not -name "acoustic_impulse_response_measurement.ipynb" > notebooks.txt
	cat notebooks.txt
	shell: bash

	- name: Execute notebooks
	run: \|
	cat notebooks.txt \| while read -r notebook; do
	jupyter nbconvert --to notebook --execute --inplace "$notebook"
	done
	continue-on-error: false
	shell: bash

	- name: Check for errors
	run: \|
	if grep "raise Exception(" *.ipynb; then
	echo "Error found in notebook(s)."
	exit 1
	else
	echo "No errors found in notebooks."
	fi
	shell: bash

Provide feedback