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ConfusionMatrixDisplay — scikit-learn 1.8.dev0 documentation

class sklearn.metrics.ConfusionMatrixDisplay(confusion_matrix, *, display_labels=None)[source]#

Confusion Matrix visualization.

It is recommended to use from_estimator or from_predictions to create a ConfusionMatrixDisplay. All parameters are stored as attributes.

For general information regarding scikit-learn visualization tools, see the Visualization Guide. For guidance on interpreting these plots, refer to the Model Evaluation Guide.

Parameters:

confusion_matrixndarray of shape (n_classes, n_classes)

Confusion matrix.

display_labelsndarray of shape (n_classes,), default=None

Display labels for plot. If None, display labels are set from 0 to n_classes - 1.

Attributes:

im_matplotlib AxesImage

Image representing the confusion matrix.

text_ndarray of shape (n_classes, n_classes), dtype=matplotlib Text, or None

Array of matplotlib axes. None if include_values is false.

ax_matplotlib Axes

Axes with confusion matrix.

figure_matplotlib Figure

Figure containing the confusion matrix.

Examples

>>> import matplotlib.pyplot as plt
>>> from sklearn.datasets import make_classification
>>> from sklearn.metrics import confusion_matrix, ConfusionMatrixDisplay
>>> from sklearn.model_selection import train_test_split
>>> from sklearn.svm import SVC
>>> X, y = make_classification(random_state=0)
>>> X_train, X_test, y_train, y_test = train_test_split(X, y,
...                                                     random_state=0)
>>> clf = SVC(random_state=0)
>>> clf.fit(X_train, y_train)
SVC(random_state=0)
>>> predictions = clf.predict(X_test)
>>> cm = confusion_matrix(y_test, predictions, labels=clf.classes_)
>>> disp = ConfusionMatrixDisplay(confusion_matrix=cm,
...                               display_labels=clf.classes_)
>>> disp.plot()
<...>
>>> plt.show()

classmethod from_estimator(estimator, X, y, *, labels=None, sample_weight=None, normalize=None, display_labels=None, include_values=True, xticks_rotation='horizontal', values_format=None, cmap='viridis', ax=None, colorbar=True, im_kw=None, text_kw=None)[source]#

Plot Confusion Matrix given an estimator and some data.

For general information regarding scikit-learn visualization tools, see the Visualization Guide. For guidance on interpreting these plots, refer to the Model Evaluation Guide.

Added in version 1.0.

Parameters:

estimatorestimator instance

Fitted classifier or a fitted Pipeline in which the last estimator is a classifier.

X{array-like, sparse matrix} of shape (n_samples, n_features)

Input values.

yarray-like of shape (n_samples,)

Target values.

labelsarray-like of shape (n_classes,), default=None

List of labels to index the confusion matrix. This may be used to reorder or select a subset of labels. If None is given, those that appear at least once in y_true or y_pred are used in sorted order.

sample_weightarray-like of shape (n_samples,), default=None

Sample weights.

normalize{‘true’, ‘pred’, ‘all’}, default=None

Either to normalize the counts display in the matrix:

• if 'true', the confusion matrix is normalized over the true conditions (e.g. rows);

• if 'pred', the confusion matrix is normalized over the predicted conditions (e.g. columns);

• if 'all', the confusion matrix is normalized by the total number of samples;

• if None (default), the confusion matrix will not be normalized.

display_labelsarray-like of shape (n_classes,), default=None

Target names used for plotting. By default, labels will be used if it is defined, otherwise the unique labels of y_true and y_pred will be used.

include_valuesbool, default=True

Includes values in confusion matrix.

xticks_rotation{‘vertical’, ‘horizontal’} or float, default=’horizontal’

Rotation of xtick labels.

values_formatstr, default=None

Format specification for values in confusion matrix. If None, the format specification is ‘d’ or ‘.2g’ whichever is shorter.

cmapstr or matplotlib Colormap, default=’viridis’

Colormap recognized by matplotlib.

axmatplotlib Axes, default=None

Axes object to plot on. If None, a new figure and axes is created.

colorbarbool, default=True

Whether or not to add a colorbar to the plot.

im_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.imshow call.

text_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.text call.

Added in version 1.2.

Returns:

displayConfusionMatrixDisplay

Examples

>>> import matplotlib.pyplot as plt
>>> from sklearn.datasets import make_classification
>>> from sklearn.metrics import ConfusionMatrixDisplay
>>> from sklearn.model_selection import train_test_split
>>> from sklearn.svm import SVC
>>> X, y = make_classification(random_state=0)
>>> X_train, X_test, y_train, y_test = train_test_split(
...         X, y, random_state=0)
>>> clf = SVC(random_state=0)
>>> clf.fit(X_train, y_train)
SVC(random_state=0)
>>> ConfusionMatrixDisplay.from_estimator(
...     clf, X_test, y_test)
<...>
>>> plt.show()

For a detailed example of using a confusion matrix to evaluate a Support Vector Classifier, please see Confusion matrix

classmethod from_predictions(y_true, y_pred, *, labels=None, sample_weight=None, normalize=None, display_labels=None, include_values=True, xticks_rotation='horizontal', values_format=None, cmap='viridis', ax=None, colorbar=True, im_kw=None, text_kw=None)[source]#

Plot Confusion Matrix given true and predicted labels.

For general information regarding scikit-learn visualization tools, see the Visualization Guide. For guidance on interpreting these plots, refer to the Model Evaluation Guide.

Added in version 1.0.

Parameters:

y_truearray-like of shape (n_samples,)

True labels.

y_predarray-like of shape (n_samples,)

The predicted labels given by the method predict of an classifier.

labelsarray-like of shape (n_classes,), default=None

List of labels to index the confusion matrix. This may be used to reorder or select a subset of labels. If None is given, those that appear at least once in y_true or y_pred are used in sorted order.

sample_weightarray-like of shape (n_samples,), default=None

Sample weights.

normalize{‘true’, ‘pred’, ‘all’}, default=None

Either to normalize the counts display in the matrix:

• if 'true', the confusion matrix is normalized over the true conditions (e.g. rows);

• if 'pred', the confusion matrix is normalized over the predicted conditions (e.g. columns);

• if 'all', the confusion matrix is normalized by the total number of samples;

• if None (default), the confusion matrix will not be normalized.

display_labelsarray-like of shape (n_classes,), default=None

Target names used for plotting. By default, labels will be used if it is defined, otherwise the unique labels of y_true and y_pred will be used.

include_valuesbool, default=True

Includes values in confusion matrix.

xticks_rotation{‘vertical’, ‘horizontal’} or float, default=’horizontal’

Rotation of xtick labels.

values_formatstr, default=None

Format specification for values in confusion matrix. If None, the format specification is ‘d’ or ‘.2g’ whichever is shorter.

cmapstr or matplotlib Colormap, default=’viridis’

Colormap recognized by matplotlib.

axmatplotlib Axes, default=None

Axes object to plot on. If None, a new figure and axes is created.

colorbarbool, default=True

Whether or not to add a colorbar to the plot.

im_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.imshow call.

text_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.text call.

Added in version 1.2.

Returns:

displayConfusionMatrixDisplay

Examples

>>> import matplotlib.pyplot as plt
>>> from sklearn.datasets import make_classification
>>> from sklearn.metrics import ConfusionMatrixDisplay
>>> from sklearn.model_selection import train_test_split
>>> from sklearn.svm import SVC
>>> X, y = make_classification(random_state=0)
>>> X_train, X_test, y_train, y_test = train_test_split(
...         X, y, random_state=0)
>>> clf = SVC(random_state=0)
>>> clf.fit(X_train, y_train)
SVC(random_state=0)
>>> y_pred = clf.predict(X_test)
>>> ConfusionMatrixDisplay.from_predictions(
...    y_test, y_pred)
<...>
>>> plt.show()

plot(*, include_values=True, cmap='viridis', xticks_rotation='horizontal', values_format=None, ax=None, colorbar=True, im_kw=None, text_kw=None)[source]#

Plot visualization.

Parameters:

include_valuesbool, default=True

Includes values in confusion matrix.

cmapstr or matplotlib Colormap, default=’viridis’

Colormap recognized by matplotlib.

xticks_rotation{‘vertical’, ‘horizontal’} or float, default=’horizontal’

Rotation of xtick labels.

values_formatstr, default=None

Format specification for values in confusion matrix. If None, the format specification is ‘d’ or ‘.2g’ whichever is shorter.

axmatplotlib axes, default=None

Axes object to plot on. If None, a new figure and axes is created.

colorbarbool, default=True

Whether or not to add a colorbar to the plot.

im_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.imshow call.

text_kwdict, default=None

Dict with keywords passed to matplotlib.pyplot.text call.

Added in version 1.2.

Returns:

displayConfusionMatrixDisplay

Returns a ConfusionMatrixDisplay instance that contains all the information to plot the confusion matrix.

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