In this post, you will learn a technique using which you could plot the learning curve of a machine learning classification model. As a data scientist, you will find the Python code example very handy.
In this post, the plot_learning_curves class of mlxtend.plotting module from mlxtend package is used. This package is created by Dr. Sebastian Raschka.
Lets train a Perceptron model using iris data from sklearn.datasets.
# Load the packages import numpy as np import pandas as pd import Matplotlib.pyplot as plt from sklearn.linear_model import Perceptron from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.metrics import accuracy_score from sklearn import datasets # Load the datasets # iris = datasets.load_iris() X = iris.data Y = iris.target # Create training / test split; Note the stratification # X_train, X_test, Y_train, Y_test = train_test_split(X, Y, test_size=0.3, random_state=1, stratify=Y) # Perform feature scaling sc = StandardScaler() sc.fit(X_train) X_train_std = sc.transform(X_train) X_test_std = sc.transform(X_test) # Fit / train the model prcptrn = Perceptron(eta0=0.1, random_state=1) prcptrn.fit(X_train_std, Y_train) # Check the accuracy of the model Y_predict_std = prcptrn.predict(X_test_std) print("Accuracy Score %.3f" % accuracy_score(Y_test, Y_predict_std))
The accuracy of the model comes out to be 0.956 or 95.6%. Next, we will want to see how did the learning go. In order to do that, we will use plot_learning_curves class of mlxtend.plotting module. Here is a post on how to install mlxtend with Anaconda.
# Load the plot_learning_curves class from mlxtend.plotting import plot_learning_curves # Plot the learning curves plot_learning_curves(X_train_std, Y_train, X_test_std, Y_test, prcptrn)
The following would be output plot of the learning curve:
It might be noticed that as the training set size increases, the model performance increases in terms of decrease in number of misclassification.
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