Added Online payment fraud detection model

OnlinePaymentFraudDetection/Readme.md

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+# Online Payment Fraud Detection
+
+## Overview
+
+This project focuses on identifying online payment fraud using machine learning techniques. We have utilized a dataset from Kaggle that contains various transaction details to build and deploy a machine learning model capable of classifying transactions as fraudulent or non-fraudulent.
+
+## Dataset
+
+The dataset contains the following columns:
+
+- `step`: Represents a unit of time where 1 step equals 1 hour.
+- `type`: Type of online transaction.
+- `amount`: The amount of the transaction.
+- `oldbalanceOrg`: Balance of the origin account before the transaction.
+- `newbalanceOrig`: Balance of the origin account after the transaction.
+- `oldbalanceDest`: Initial balance of the recipient before the transaction.
+- `newbalanceDest`: The new balance of the recipient after the transaction.
+- `isFraud`: Indicator of fraud (1 if the transaction is fraudulent, 0 otherwise).
+
+## Preprocessing
+
+1. **Dropping unnecessary columns**:
+   ```python
+   data.drop("nameOrig", inplace=True, axis=1)
+   data.drop("nameDest", inplace=True, axis=1)
+   ```
+
+2. **Mapping transaction types**:
+   ```python
+   data["type"] = data["type"].map({"CASH_OUT" : 1, "PAYMENT" : 2, "CASH_IN" : 3, "TRANSFER" : 4, "DEBIT" : 5})
+   ```
+
+3. **Checking for null values**:
+   ```python
+   print(data.isnull().sum())  # Confirming no null values are present
+   ```
+
+## Data Visualization
+
+We visualized the distribution of transaction types using a pie chart:
+
+```python
+import plotly.express as px
+
+type = data["type"].value_counts()
+transactions = type.index
+quantity = type.values
+
+figure = px.pie(data, values = quantity, names = transactions, hole = 0.5, title = "Distribution of Transaction Type")
+figure.show()
+```
+
+## Correlation Analysis
+
+We analyzed the correlation between the features and the target variable (`isFraud`):
+
+```python
+correlation = data.corr()
+print(correlation["isFraud"].sort_values(ascending = False))
+```
+
+## Splitting the Data
+
+The data was split into training and testing sets:
+
+```python
+from sklearn.model_selection import train_test_split
+
+x = np.array(data[["type", "amount", "oldbalanceOrg", "newbalanceOrig"]])
+y = np.array(data[["isFraud"]])
+
+xtrain, xtest, ytrain, ytest = train_test_split(x, y, test_size = 0.10, random_state = 42)
+```
+
+## Model Training
+
+We trained a Decision Tree classifier on the dataset:
+
+```python
+from sklearn.tree import DecisionTreeClassifier
+
+model = DecisionTreeClassifier()
+model.fit(xtrain, ytrain)
+print(model.score(xtest, ytest))
+```
+
+## Deployment
+
+We deployed the model as a web application using Gradio:
+
+```python
+!pip install gradio
+import gradio as gr
+
+def predict_fraud(transaction_type, amount, oldbalanceOrg, newbalanceOrig):
+    features = np.array([[transaction_type, amount, oldbalanceOrg, newbalanceOrig]])
+    output = model.predict(features)
+    return "Fraud" if output == 1 else "No Fraud"
+
+inputs = [
+    gr.Number(label="Transaction Type"),
+    gr.Number(label="Amount"),
+    gr.Number(label="Old Balance Org"),
+    gr.Number(label="New Balance Orig")
+]
+
+output = gr.Textbox(label="Fraud Prediction")
+
+gr.Interface(fn=predict_fraud, inputs=inputs, outputs=output, title="Online Fraud Detection").launch(share=True)
+```
+
+## Conclusion
+
+This project successfully implements a machine learning model to detect fraudulent transactions based on transaction type, amount, and account balances before and after the transaction. The model is deployed using Gradio for easy interaction and prediction of fraud in real-time.
+
+## Future Work
+
+- **Improving Model Performance**: Experimenting with more complex algorithms like Random Forest, Gradient Boosting, or Neural Networks.
+- **Feature Engineering**: Creating additional features that could improve model accuracy.
+- **Handling Imbalanced Data**: Implementing techniques to handle imbalanced data to improve fraud detection.
+- **Real-time Data Processing**: Integrating the model into a real-time transaction processing system for live fraud detection.
+
+## Requirements
+
+- Python 3.x
+- Pandas
+- NumPy
+- Scikit-learn
+- Plotly
+- Gradio
+
+## How to Run
+
+1. **Install the required packages**:
+   ```bash
+   pip install pandas numpy scikit-learn plotly gradio
+   ```
+
+2. **Run the script**:
+   ```bash
+   python script_name.py
+   ```
+
+3. **Interact with the web application**:
+   - The Gradio interface will launch and provide a URL for accessing the web app.