ROC Curve with Visualization API#

Scikit-learn defines a simple API for creating visualizations for machine learning. The key features of this API is to allow for quick plotting and visual adjustments without recalculation. In this example, we will demonstrate how to use the visualization API by comparing ROC curves.

Load Data and Train a SVC#

First, we load the wine dataset and convert it to a binary classification problem. Then, we train a support vector classifier on a training dataset.

import matplotlib.pyplot as plt

from sklearn.datasets import load_wine
from sklearn.ensemble import RandomForestClassifier
from sklearn.metrics import RocCurveDisplay
from sklearn.model_selection import train_test_split
from sklearn.svm import SVC

X, y = load_wine(return_X_y=True)
y = y == 2

X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=42)
svc = SVC(random_state=42)
svc.fit(X_train, y_train)
SVC(random_state=42)
In a Jupyter environment, please rerun this cell to show the HTML representation or trust the notebook.
On GitHub, the HTML representation is unable to render, please try loading this page with nbviewer.org.


Plotting the ROC Curve#

Next, we plot the ROC curve with a single call to sklearn.metrics.RocCurveDisplay.from_estimator. The returned svc_disp object allows us to continue using the already computed ROC curve for the SVC in future plots.

svc_disp = RocCurveDisplay.from_estimator(svc, X_test, y_test)
plt.show()
plot roc curve visualization api

Training a Random Forest and Plotting the ROC Curve#

We train a random forest classifier and create a plot comparing it to the SVC ROC curve. Notice how svc_disp uses plot to plot the SVC ROC curve without recomputing the values of the roc curve itself. Furthermore, we pass alpha=0.8 to the plot functions to adjust the alpha values of the curves.

rfc = RandomForestClassifier(n_estimators=10, random_state=42)
rfc.fit(X_train, y_train)
ax = plt.gca()
rfc_disp = RocCurveDisplay.from_estimator(rfc, X_test, y_test, ax=ax, alpha=0.8)
svc_disp.plot(ax=ax, alpha=0.8)
plt.show()
plot roc curve visualization api

Total running time of the script: (0 minutes 0.146 seconds)

Related examples

Receiver Operating Characteristic (ROC) with cross validation

Receiver Operating Characteristic (ROC) with cross validation

Detection error tradeoff (DET) curve

Detection error tradeoff (DET) curve

Release Highlights for scikit-learn 0.22

Release Highlights for scikit-learn 0.22

Multiclass Receiver Operating Characteristic (ROC)

Multiclass Receiver Operating Characteristic (ROC)

Gallery generated by Sphinx-Gallery