
.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/model_selection/plot_validation_curve.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_auto_examples_model_selection_plot_validation_curve.py>`
        to download the full example code or to run this example in your browser via Binder

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_auto_examples_model_selection_plot_validation_curve.py:


==========================
Plotting Validation Curves
==========================

In this plot you can see the training scores and validation scores of an SVM
for different values of the kernel parameter gamma. For very low values of
gamma, you can see that both the training score and the validation score are
low. This is called underfitting. Medium values of gamma will result in high
values for both scores, i.e. the classifier is performing fairly well. If gamma
is too high, the classifier will overfit, which means that the training score
is good but the validation score is poor.

.. GENERATED FROM PYTHON SOURCE LINES 15-41



.. image-sg:: /auto_examples/model_selection/images/sphx_glr_plot_validation_curve_001.png
   :alt: Validation Curve for SVM with an RBF kernel
   :srcset: /auto_examples/model_selection/images/sphx_glr_plot_validation_curve_001.png
   :class: sphx-glr-single-img





.. code-block:: default


    import matplotlib.pyplot as plt
    import numpy as np

    from sklearn.datasets import load_digits
    from sklearn.model_selection import ValidationCurveDisplay
    from sklearn.svm import SVC

    X, y = load_digits(return_X_y=True)
    subset_mask = np.isin(y, [1, 2])  # binary classification: 1 vs 2
    X, y = X[subset_mask], y[subset_mask]

    disp = ValidationCurveDisplay.from_estimator(
        SVC(),
        X,
        y,
        param_name="gamma",
        param_range=np.logspace(-6, -1, 5),
        score_type="both",
        n_jobs=2,
        score_name="Accuracy",
    )
    disp.ax_.set_title("Validation Curve for SVM with an RBF kernel")
    disp.ax_.set_xlabel(r"gamma (inverse radius of the RBF kernel)")
    disp.ax_.set_ylim(0.0, 1.1)
    plt.show()


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.742 seconds)


.. _sphx_glr_download_auto_examples_model_selection_plot_validation_curve.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example


    .. container:: binder-badge

      .. image:: images/binder_badge_logo.svg
        :target: https://mybinder.org/v2/gh/scikit-learn/scikit-learn/1.3.X?urlpath=lab/tree/notebooks/auto_examples/model_selection/plot_validation_curve.ipynb
        :alt: Launch binder
        :width: 150 px



    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: plot_validation_curve.py <plot_validation_curve.py>`

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: plot_validation_curve.ipynb <plot_validation_curve.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_
