ann.py

""" Artificial Neural Network
"""


# Importing the libraries
import pandas as pd
from sklearn.preprocessing import LabelEncoder, OneHotEncoder
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
from keras.models import Sequential
from keras.layers import Dense
from sklearn.metrics import confusion_matrix

def main():
    # Part 1 - Data Preprocessing

    # Importing the dataset
    dataset = pd.read_csv('Churn_Modelling.csv')
    X = dataset.iloc[:, 3:13].values
    y = dataset.iloc[:, 13].values

    # Encoding categorical data
    labelencoder_X_1 = LabelEncoder()
    X[:, 1] = labelencoder_X_1.fit_transform(X[:, 1])
    labelencoder_X_2 = LabelEncoder()
    X[:, 2] = labelencoder_X_2.fit_transform(X[:, 2])
    onehotencoder = OneHotEncoder(categorical_features=[1])
    X = onehotencoder.fit_transform(X).toarray()
    X = X[:, 1:]

    # Splitting the dataset into the Training set and Test set
    X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=0)

    # Feature Scaling
    sc = StandardScaler()
    X_train = sc.fit_transform(X_train)
    X_test = sc.transform(X_test)

    # Part 2 - Now let's make the ANN!

    # Initialising the ANN
    classifier = Sequential()

    # Adding the input layer and the first hidden layer
    classifier.add(Dense(output_dim=6, init='uniform', activation='relu', input_dim=11))

    # Adding the second hidden layer
    classifier.add(Dense(output_dim=6, init='uniform', activation='relu'))

    # Adding the output layer
    classifier.add(Dense(output_dim=1, init='uniform', activation='sigmoid'))

    # Compiling the ANN
    classifier.compile(optimizer='adam', loss='binary_crossentropy', metrics=['accuracy'])

    # Fitting the ANN to the Training set
    classifier.fit(X_train, y_train, batch_size=10, nb_epoch=100)

    # Part 3 - Making the predictions and evaluating the model

    # Predicting the Test set results
    y_pred = classifier.predict(X_test)
    y_pred = (y_pred > 0.5)

    # Making the Confusion Matrix
    cm = confusion_matrix(y_test, y_pred)


if __name__ == '__main__':
    main()