.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "auto_examples/miscellaneous/plot_multioutput_face_completion.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_miscellaneous_plot_multioutput_face_completion.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_miscellaneous_plot_multioutput_face_completion.py:


==============================================
使用多输出估计器进行人脸补全
==============================================

本示例展示了如何使用多输出估计器来补全图像。
目标是根据人脸的上半部分预测下半部分。

第一列图像显示了真实的人脸。接下来的几列展示了极端随机树、k近邻、线性回归和岭回归如何补全这些人脸的下半部分。

.. GENERATED FROM PYTHON SOURCE LINES 12-96



.. image-sg:: /auto_examples/miscellaneous/images/sphx_glr_plot_multioutput_face_completion_001.png
   :alt: Face completion with multi-output estimators, true faces, Extra trees, K-nn, Linear regression, Ridge
   :srcset: /auto_examples/miscellaneous/images/sphx_glr_plot_multioutput_face_completion_001.png
   :class: sphx-glr-single-img





.. code-block:: Python


    import matplotlib.pyplot as plt
    import numpy as np

    from sklearn.datasets import fetch_olivetti_faces
    from sklearn.ensemble import ExtraTreesRegressor
    from sklearn.linear_model import LinearRegression, RidgeCV
    from sklearn.neighbors import KNeighborsRegressor
    from sklearn.utils.validation import check_random_state

    # 加载人脸数据集
    data, targets = fetch_olivetti_faces(return_X_y=True)

    train = data[targets < 30]
    test = data[targets >= 30]  # Test on independent people

    # 在一部分人群中进行测试
    n_faces = 5
    rng = check_random_state(4)
    face_ids = rng.randint(test.shape[0], size=(n_faces,))
    test = test[face_ids, :]

    n_pixels = data.shape[1]
    # 脸的上半部分
    # 
    # 
    X_train = train[:, : (n_pixels + 1) // 2]
    # 面部的下半部分
    y_train = train[:, n_pixels // 2 :]
    X_test = test[:, : (n_pixels + 1) // 2]
    y_test = test[:, n_pixels // 2 :]

    # 拟合估计器
    ESTIMATORS = {
        "Extra trees": ExtraTreesRegressor(
            n_estimators=10, max_features=32, random_state=0
        ),
        "K-nn": KNeighborsRegressor(),
        "Linear regression": LinearRegression(),
        "Ridge": RidgeCV(),
    }

    y_test_predict = dict()
    for name, estimator in ESTIMATORS.items():
        estimator.fit(X_train, y_train)
        y_test_predict[name] = estimator.predict(X_test)

    # 绘制完成的面部
    image_shape = (64, 64)

    n_cols = 1 + len(ESTIMATORS)
    plt.figure(figsize=(2.0 * n_cols, 2.26 * n_faces))
    plt.suptitle("Face completion with multi-output estimators", size=16)

    for i in range(n_faces):
        true_face = np.hstack((X_test[i], y_test[i]))

        if i:
            sub = plt.subplot(n_faces, n_cols, i * n_cols + 1)
        else:
            sub = plt.subplot(n_faces, n_cols, i * n_cols + 1, title="true faces")

        sub.axis("off")
        sub.imshow(
            true_face.reshape(image_shape), cmap=plt.cm.gray, interpolation="nearest"
        )

        for j, est in enumerate(sorted(ESTIMATORS)):
            completed_face = np.hstack((X_test[i], y_test_predict[est][i]))

            if i:
                sub = plt.subplot(n_faces, n_cols, i * n_cols + 2 + j)

            else:
                sub = plt.subplot(n_faces, n_cols, i * n_cols + 2 + j, title=est)

            sub.axis("off")
            sub.imshow(
                completed_face.reshape(image_shape),
                cmap=plt.cm.gray,
                interpolation="nearest",
            )

    plt.show()


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

   **Total running time of the script:** (0 minutes 4.551 seconds)


.. _sphx_glr_download_auto_examples_miscellaneous_plot_multioutput_face_completion.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/main?urlpath=lab/tree/notebooks/auto_examples/miscellaneous/plot_multioutput_face_completion.ipynb
        :alt: Launch binder
        :width: 150 px

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

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

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

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

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: plot_multioutput_face_completion.zip <plot_multioutput_face_completion.zip>`


.. include:: plot_multioutput_face_completion.recommendations


.. only:: html

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

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