keras-tuner

What it is and what it does

KerasTuner is a hyperparameter optimization framework designed to automate the search for optimal model configurations in Keras. It provides a define-by-run syntax where you write a function that builds your model and uses the `hp` argument to declare which hyperparameters to tune, then delegates the search to one of several built-in algorithms: Bayesian Optimization, Hyperband, or Random Search. The framework handles the trial management, evaluation, and model selection, returning the best-performing model based on your chosen objective metric.

The package integrates with keras as its primary dependency and relies on packaging, requests, kt-legacy, grpcio, and protobuf for configuration management, API communication, and serialization. KerasTuner is intended for researchers and practitioners who need to systematically explore hyperparameter spaces without manually implementing search logic, and it is designed to be extensible for experimenting with custom search algorithms.

Use it for

• Automatically find optimal layer sizes, learning rates, and activation functions for a model without manual trial-and-error.
• Compare multiple search algorithms (Bayesian, Hyperband, Random) on the same model to identify which converges fastest.
• Scale hyperparameter search across distributed systems using the framework's built-in support for parallel trials.
• Experiment with new search algorithms by extending KerasTuner's base classes for research or domain-specific optimization.
• Reduce model development time by systematically tuning a large number of hyperparameters in a single reproducible workflow.

Worth the install?

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Install

keras-tuner on PyPI

Before you install

Low install friction with a pure-Python wheel. The package depends on keras, packaging, requests, kt-legacy, grpcio, and protobuf. Maintenance status is aging—last release was 276 days ago, though the repository remains active with a recent commit on 2025-12-01.

Requires Python 3.8+ and a compatible version of keras.

License in practice

Licensed under Apache License 2.0 (permissive), so you can use, modify, and distribute the package freely in commercial and private projects without restriction.

Quickstart

pip install keras-tuner

import keras_tuner
from keras import Sequential, layers

def build_model(hp):
    model = Sequential()
    model.add(layers.Dense(hp.Choice('units', [8, 16, 32]), activation='relu'))
    model.add(layers.Dense(1, activation='relu'))
    model.compile(loss='mse')
    return model

tuner = keras_tuner.RandomSearch(build_model, objective='val_loss', max_trials=5)
tuner.search(x_train, y_train, epochs=5, validation_data=(x_val, y_val))
best_model = tuner.get_best_models()[0]

Package facts

Evidence: keras_tuner-1.4.8-py3-none-any.whl

Tags

More Software Development packages

See also ConfigSpace · kt-legacy · optuna · sweeps · pyannote-pipeline · hyperopt · FLAML · keras-hub · ax-platform · bayesian-optimization