sklearn/examples/model_selection/plot_learning_curve.py

"""
=========================================================
Plotting Learning Curves and Checking Models' Scalability
=========================================================

In this example, we show how to use the class
:class:`~sklearn.model_selection.LearningCurveDisplay` to easily plot learning
curves. In addition, we give an interpretation to the learning curves obtained
for a naive Bayes and SVM classifiers.

Then, we explore and draw some conclusions about the scalability of these predictive
models by looking at their computational cost and not only at their statistical
accuracy.
"""

# %%
# Learning Curve
# ==============
#
# Learning curves show the effect of adding more samples during the training
# process. The effect is depicted by checking the statistical performance of
# the model in terms of training score and testing score.
#
# Here, we compute the learning curve of a naive Bayes classifier and a SVM
# classifier with a RBF kernel using the digits dataset.
from sklearn.datasets import load_digits
from sklearn.naive_bayes import GaussianNB
from sklearn.svm import SVC

X, y = load_digits(return_X_y=True)
naive_bayes = GaussianNB()
svc = SVC(kernel="rbf", gamma=0.001)

# %%
# The :meth:`~sklearn.model_selection.LearningCurveDisplay.from_estimator`
# displays the learning curve given the dataset and the predictive model to
# analyze. To get an estimate of the scores uncertainty, this method uses
# a cross-validation procedure.
import matplotlib.pyplot as plt
import numpy as np

from sklearn.model_selection import LearningCurveDisplay, ShuffleSplit

fig, ax = plt.subplots(nrows=1, ncols=2, figsize=(10, 6), sharey=True)

common_params = {
    "X": X,
    "y": y,
    "train_sizes": np.linspace(0.1, 1.0, 5),
    "cv": ShuffleSplit(n_splits=50, test_size=0.2, random_state=0),
    "score_type": "both",
    "n_jobs": 4,
    "line_kw": {"marker": "o"},
    "std_display_style": "fill_between",
    "score_name": "Accuracy",
}

for ax_idx, estimator in enumerate([naive_bayes, svc]):
    LearningCurveDisplay.from_estimator(estimator, **common_params, ax=ax[ax_idx])
    handles, label = ax[ax_idx].get_legend_handles_labels()
    ax[ax_idx].legend(handles[:2], ["Training Score", "Test Score"])
    ax[ax_idx].set_title(f"Learning Curve for {estimator.__class__.__name__}")

# %%
# We first analyze the learning curve of the naive Bayes classifier. Its shape
# can be found in more complex datasets very often: the training score is very
# high when using few samples for training and decreases when increasing the
# number of samples, whereas the test score is very low at the beginning and
# then increases when adding samples. The training and test scores become more
# realistic when all the samples are used for training.
#
# We see another typical learning curve for the SVM classifier with RBF kernel.
# The training score remains high regardless of the size of the training set.
# On the other hand, the test score increases with the size of the training
# dataset. Indeed, it increases up to a point where it reaches a plateau.
# Observing such a plateau is an indication that it might not be useful to
# acquire new data to train the model since the generalization performance of
# the model will not increase anymore.
#
# Complexity analysis
# ===================
#
# In addition to these learning curves, it is also possible to look at the
# scalability of the predictive models in terms of training and scoring times.
#
# The :class:`~sklearn.model_selection.LearningCurveDisplay` class does not
# provide such information. We need to resort to the
# :func:`~sklearn.model_selection.learning_curve` function instead and make
# the plot manually.

# %%
from sklearn.model_selection import learning_curve

common_params = {
    "X": X,
    "y": y,
    "train_sizes": np.linspace(0.1, 1.0, 5),
    "cv": ShuffleSplit(n_splits=50, test_size=0.2, random_state=0),
    "n_jobs": 4,
    "return_times": True,
}

train_sizes, _, test_scores_nb, fit_times_nb, score_times_nb = learning_curve(
    naive_bayes, **common_params
)
train_sizes, _, test_scores_svm, fit_times_svm, score_times_svm = learning_curve(
    svc, **common_params
)

# %%
fig, ax = plt.subplots(nrows=2, ncols=2, figsize=(16, 12), sharex=True)

for ax_idx, (fit_times, score_times, estimator) in enumerate(
    zip(
        [fit_times_nb, fit_times_svm],
        [score_times_nb, score_times_svm],
        [naive_bayes, svc],
    )
):
    # scalability regarding the fit time
    ax[0, ax_idx].plot(train_sizes, fit_times.mean(axis=1), "o-")
    ax[0, ax_idx].fill_between(
        train_sizes,
        fit_times.mean(axis=1) - fit_times.std(axis=1),
        fit_times.mean(axis=1) + fit_times.std(axis=1),
        alpha=0.3,
    )
    ax[0, ax_idx].set_ylabel("Fit time (s)")
    ax[0, ax_idx].set_title(
        f"Scalability of the {estimator.__class__.__name__} classifier"
    )

    # scalability regarding the score time
    ax[1, ax_idx].plot(train_sizes, score_times.mean(axis=1), "o-")
    ax[1, ax_idx].fill_between(
        train_sizes,
        score_times.mean(axis=1) - score_times.std(axis=1),
        score_times.mean(axis=1) + score_times.std(axis=1),
        alpha=0.3,
    )
    ax[1, ax_idx].set_ylabel("Score time (s)")
    ax[1, ax_idx].set_xlabel("Number of training samples")

# %%
# We see that the scalability of the SVM and naive Bayes classifiers is very
# different. The SVM classifier complexity at fit and score time increases
# rapidly with the number of samples. Indeed, it is known that the fit time
# complexity of this classifier is more than quadratic with the number of
# samples which makes it hard to scale to dataset with more than a few
# 10,000 samples. In contrast, the naive Bayes classifier scales much better
# with a lower complexity at fit and score time.
#
# Subsequently, we can check the trade-off between increased training time and
# the cross-validation score.

# %%
fig, ax = plt.subplots(nrows=1, ncols=2, figsize=(16, 6))

for ax_idx, (fit_times, test_scores, estimator) in enumerate(
    zip(
        [fit_times_nb, fit_times_svm],
        [test_scores_nb, test_scores_svm],
        [naive_bayes, svc],
    )
):
    ax[ax_idx].plot(fit_times.mean(axis=1), test_scores.mean(axis=1), "o-")
    ax[ax_idx].fill_between(
        fit_times.mean(axis=1),
        test_scores.mean(axis=1) - test_scores.std(axis=1),
        test_scores.mean(axis=1) + test_scores.std(axis=1),
        alpha=0.3,
    )
    ax[ax_idx].set_ylabel("Accuracy")
    ax[ax_idx].set_xlabel("Fit time (s)")
    ax[ax_idx].set_title(
        f"Performance of the {estimator.__class__.__name__} classifier"
    )

plt.show()

# %%
# In these plots, we can look for the inflection point for which the
# cross-validation score does not increase anymore and only the training time
# increases.