How to Install `optuna` in Python

v4.8.0 Data & Science Python >=3.9

A hyperparameter optimization framework

Install pip install optuna

What is optuna?

A hyperparameter optimization framework

Optuna: A hyperparameter optimization framework

Optuna is an automatic hyperparameter optimization software framework, particularly designed for machine learning. It features an imperative, define-by-run style user API. Thanks to our define-by-run API, the code written with Optuna enjoys high modularity, and the user of Optuna can dynamically construct the search spaces for the hyperparameters.

PyPI page → Author: Takuya Akiba

Quick Start

Minimal example to get started with optuna:

import optuna

print(optuna.__version__)

Installation

pip (standard)

pip install optuna

Virtual environment (recommended)

python -m venv venv
source venv/bin/activate   # Windows: venv\Scripts\activate
pip install optuna

pip3

pip3 install optuna

conda

conda install -c conda-forge optuna

Poetry

poetry add optuna

Dependencies

Installing optuna will also install these packages:

alembic colorlog numpy packaging sqlalchemy tqdm PyYAML

Verify the Installation

After installing, confirm the package is available:

python -c "import optuna; print(optuna.__version__)"

If this prints a version number, installation succeeded. If you see a ModuleNotFoundError, see the errors section below.

Installation Errors

Common errors when installing optuna with pip.

ModuleNotFoundError: No module named 'optuna'

Cause: The package is not installed in the current Python environment.

Fix: Run pip install optuna. If using a virtual environment, ensure it is activated first.

ModuleNotFoundError: No module named 'optuna' (installed but still failing)

Cause: pip installed the package into a different Python than the one running your script.

Fix: Use python -m pip install optuna to install into the interpreter you are running.

ImportError: cannot import name 'X' from 'optuna'

Cause: The function or class does not exist in the installed version.

Fix: Check the version with pip show optuna and upgrade with pip install --upgrade optuna.

pip: command not found

Cause: pip is not in PATH or Python was not added to PATH during installation.

Fix: Try python -m pip install optuna. On macOS/Linux try pip3.

PermissionError: [Errno 13] Permission denied

Cause: No write access to the system Python package directory.

Fix: Use a virtual environment, or add --user: pip install --user optuna

SSL: CERTIFICATE_VERIFY_FAILED

Cause: pip cannot verify PyPI's SSL certificate — common behind corporate proxies.

Fix: Try: pip install --trusted-host pypi.org --trusted-host files.pythonhosted.org optuna

MemoryError when loading data

Cause: Dataset is too large to fit in RAM.

Fix: Read in chunks, filter columns on load, or consider Polars/Dask for out-of-core processing.

Recent Releases

Version	Released
`4.8.0` latest	2026-03-16
`4.7.0`	2026-01-19
`4.6.0`	2025-11-10
`4.5.0`	2025-08-18
`4.4.0`	2025-06-16

Full release history on PyPI →

Manage optuna

Upgrade to latest version

pip install --upgrade optuna

Install a specific version

pip install optuna==4.8.0

Uninstall

pip uninstall optuna

Check what is installed

pip show optuna

Last updated: 2026-04-11 • Data from PyPI

How to Install optuna in Python