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randomforestclassifier.py
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randomforestclassifier.py
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#import libs
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
from sklearn.ensemble import RandomForestClassifier
from sklearn.metrics import confusion_matrix
#get dataset
dataset = pd.read_csv('Social_Network_Ads.csv')
#get the dependanta and independat varibales
X = dataset.iloc[: , [2,3]].values
y = dataset.iloc[: , 4].values
#split the data into train and test set
X_train , X_test , y_train , y_test = train_test_split(X , y , test_size=0.25 , random_state=0)
#scale the values of X_train and X_test
X_scaler = StandardScaler()
X_train = X_scaler.fit_transform(X_train)
X_test = X_scaler.transform(X_test)
#fit the data
classifier = RandomForestClassifier(n_estimators=10 , criterion='entropy' , random_state=0)
classifier.fit(X_train , y_train)
#make prediction
y_pred = classifier.predict(X_test)
#create confusion matrix
cm = confusion_matrix(y_test , y_pred)
#plot the graph
#training dataset
X_set , y_set = X_train , y_train
X1 , X2 = np.meshgrid(np.arange(X_set[: , 0].min() - 1 , X_set[: , 0].max() + 1 , 0.01) ,
np.arange(X_set[: , 1].min() - 1 , X_set[: , 1].max() + 1 , 0.01))
plt.contourf(X1 , X2 , classifier.predict(np.array([X1.ravel() , X2.ravel()]).T).reshape(X1.shape) , alpha=0.75 , cmap=ListedColormap(('red','green')))
plt.xlim(X1.min() , X1.max())
plt.ylim(X2.min() , X2.max())
for i , j in enumerate(np.unique(y_set)):
plt.scatter(X_set[y_set == j , 0] , X_set[y_set == j , 1] , c = ListedColormap(('red' , 'green'))(i) , label=j)
plt.title("Random Forest Classification (Training data set)")
plt.xlabel("Age")
plt.ylabel("Estimated Salary")
plt.legend()
plt.show()
#testing dataset
X_set , y_set = X_test , y_test
X1 , X2 = np.meshgrid(np.arange(X_set[: , 0].min() - 1 , X_set[: , 1].max() + 1 , 0.01) ,
np.arange(X_set[: , 1].min() - 1 , X_set[: , 1].max() + 1 , 0.01))
plt.contourf(X1 , X2 , classifier.predict(np.array([X1.ravel() , X2.ravel()]).T).reshape(X1.shape) , alpha=0.75 , cmap=ListedColormap(('red','green')))
plt.xlim(X1.min() , X1.max())
plt.ylim(X2.min() , X2.max())
for i , j in enumerate(np.unique(y_set)):
plt.scatter(X_set[y_set == j , 0] , X_set[y_set == j , 1] , c = ListedColormap(('red','green'))(i) , label=j)
plt.title("Random Forest Classifier (Testing data set)")
plt.xlabel("Age")
plt.ylabel("Estimated Salary")
plt.legend()
plt.show()
print(cm)