Simple credit card fraud detection using logistic regression in python?


To detect fraud transaction using logistic regression algorithm using python.

  Read the data set.

  Do data pre-processing.

   Split the data into train and test.

   Build the logistic model.

   Train the classifier.

   Test the classifier with test data.

   Measure precision,recall and f1-score and accuracy of the model.

#import libraries
import warnings
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
from sklearn.model_selection import train_test_split
from sklearn.linear_model import LogisticRegression
from sklearn import metrics
from sklearn.metrics import classification_report

#read the data set
data = pd.read_csv(‘/home/soft23/soft23/Sathish/practice/creditcard.csv’)

#taking sample from population if need
#data = data.sample(30000)

#no of rows and columns
print(“Total rows and columns\n\n”,data.shape,”\n”)

#Dependent and independent variable
X = data.iloc[:, 1:30].columns

y = data[‘Class’]

X = data[X]

#total count in each class
count = data[‘Class’].value_counts()
print(“Total count in each class\n\n”,count)

#splitting the data
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)

#Build the model
clf = LogisticRegression()

# Train the classifier, y_train)

#test the model
y_pred = clf.predict(X_test)

#classification report
cr = (classification_report(y_test, y_pred))

#confusion matrix
cm = (metrics.confusion_matrix(y_test, y_pred))
print(“Confusion Matrix:\n\n”,cm,”\n”)

#classification report
print(classification_report(y_test, y_pred))

#Accuracy score
a= (metrics.accuracy_score(y_test, y_pred))
print(“Accuracy score:”,round(a,1))

#heat map for confusion matrix
fig, ax = plt.subplots(figsize=(7,4))
sns.heatmap(cm, annot=True, fmt=’d’)

#print the actual and predicted labels
df1 = pd.DataFrame({‘Actual’:y_test, ‘Predicted’: y_pred})

#ROC curve evaluation
print(“Roc Curve evaluation”)
fpr, tpr, _ = metrics.roc_curve(y_test, y_pred)
auc = metrics.roc_auc_score(y_test, y_pred)
plt.plot(fpr,tpr,label=”data, auc=”+str(auc))

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