Which of the following options will complete the missing code lines to:i) train the MLPClassifier,ii) predict the test set labels,iii) count the number of misclassified samples,iv) call the function to print the results.from sklearn.datasets import make_moonsfrom sklearn.model_selection import train_test_splitfrom sklearn.neural_network import MLPClassifierfrom sklearn.preprocessing import StandardScalerimport numpy as np# Generate a two-moon datasetX, y = make_moons(n_samples=1000, noise=0.2, random_state=42)# Split the dataset into training and test setsX_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42)# Scale the featuresscaler = StandardScaler()X_train_scaled = scaler.fit_transform(X_train)X_test_scaled = scaler.transform(X_test)# Initialise the MLPClassifier with one hidden layer with 10 neuronsmlp = MLPClassifier(hidden_layer_sizes=(10,), max_iter=1000, random_state=42)# [Your Code Here] - Train the MLPClassifier on the scaled training data# [Your Code Here] - Predict the labels for the scaled test data# [Your Code Here] - Print the number of misclassified samples in the test setmlp.fit(X_train_scaled, y_train)y_pred = mlp.predict(X_test_scaled)print(np.sum(y_test != y_pred))mlp.train(X_train_scaled, y_train)y_pred = mlp.classify(X_test_scaled)print((y_test - y_pred).count_nonzero())mlp.fit(X_train_scaled, y_train)y_pred = mlp.predict(X_test_scaled)misclassified = np.where(y_test != y_pred, 1, 0)print(misclassified.sum())mlp.train(X_train_scaled, y_train)y_pred = mlp.test(X_test_scaled)print(np.count_nonzero(y_test == y_pred))
Question
Which of the following options will complete the missing code lines to:i) train the MLPClassifier,ii) predict the test set labels,iii) count the number of misclassified samples,iv) call the function to print the results.from sklearn.datasets import make_moonsfrom sklearn.model_selection import train_test_splitfrom sklearn.neural_network import MLPClassifierfrom sklearn.preprocessing import StandardScalerimport numpy as np# Generate a two-moon datasetX, y = make_moons(n_samples=1000, noise=0.2, random_state=42)# Split the dataset into training and test setsX_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42)# Scale the featuresscaler = StandardScaler()X_train_scaled = scaler.fit_transform(X_train)X_test_scaled = scaler.transform(X_test)# Initialise the MLPClassifier with one hidden layer with 10 neuronsmlp = MLPClassifier(hidden_layer_sizes=(10,), max_iter=1000, random_state=42)# [Your Code Here] - Train the MLPClassifier on the scaled training data# [Your Code Here] - Predict the labels for the scaled test data# [Your Code Here] - Print the number of misclassified samples in the test setmlp.fit(X_train_scaled, y_train)y_pred = mlp.predict(X_test_scaled)print(np.sum(y_test != y_pred))mlp.train(X_train_scaled, y_train)y_pred = mlp.classify(X_test_scaled)print((y_test - y_pred).count_nonzero())mlp.fit(X_train_scaled, y_train)y_pred = mlp.predict(X_test_scaled)misclassified = np.where(y_test != y_pred, 1, 0)print(misclassified.sum())mlp.train(X_train_scaled, y_train)y_pred = mlp.test(X_test_scaled)print(np.count_nonzero(y_test == y_pred))
Solution
The correct code to complete the missing lines is:
# Train the MLPClassifier on the scaled training data
mlp.fit(X_train_scaled, y_train)
# Predict the labels for the scaled test data
y_pred = mlp.predict(X_test_scaled)
# Print the number of misclassified samples in the test set
print(np.sum(y_test != y_pred))
Here's why:
-
mlp.fit(X_train_scaled, y_train)is used to train the MLPClassifier on the scaled training data. Thefitmethod in scikit-learn is used for training a model with the given training data. -
y_pred = mlp.predict(X_test_scaled)is used to predict the labels for the scaled test data. Thepredictmethod in scikit-learn is used for making predictions with the trained model. -
print(np.sum(y_test != y_pred))is used to print the number of misclassified samples in the test set. This line of code compares the true labelsy_testwith the predicted labelsy_pred. If a prediction is incorrect, the result of the comparison isTrue(which is equivalent to 1), and if it's correct, the result isFalse(which is equivalent to 0). Thenp.sumfunction then adds up all theTruevalues, giving the total number of misclassified samples.
Similar Questions
Which code snippet can be used to fill in the missing lines of code to train the SVM classifier, predict the test set results, and print the classification report?from sklearn.datasets import make_classificationfrom sklearn.model_selection import train_test_splitfrom sklearn.svm import SVCfrom sklearn.metrics import classification_report# Generate a synthetic datasetX, y = make_classification(n_samples=1000, n_features=20, n_classes=2, random_state=42)# Split the data into training and test setsX_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.25, random_state=42)# Initialise the SVM classifier with a radial basis function kernelsvm_rbf = SVC(kernel='rbf')# Fit the classifier to the training data# [Your Code Here] - Line to add for fitting the model# Predict the test set results# [Your Code Here] - Line to add for making predictions# Generate and print the classification report# [Your Code Here] - Line to add for printing the classification report
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