---
license: mit
language:
- en
tags:
- email
- spam
- spamdetection
---
 
 # 📩 Spam Detection Neural Network (PyTorch)

[![Python](https://img.shields.io/badge/python-3.10-blue.svg)](https://www.python.org/)
[![PyTorch](https://img.shields.io/badge/pytorch-2.1-red.svg)](https://pytorch.org/)
[![License](https://img.shields.io/badge/license-MIT-green.svg)](LICENSE)

A **simple, real-world spam detection neural network** built from scratch in **PyTorch**.  
This model classifies SMS / short text messages as **Spam** or **Ham (Not Spam)**.

The project is **small, easy to understand, and perfect for learning**.  
You can fork it, fine-tune it, and use it as a **starting point for your own projects**.

---

## 🧠 Model Overview

- **Framework:** PyTorch  
- **Architecture:** Fully Connected Neural Network (MLP)  
- **Input:** Bag-of-Words text vectors  
- **Output:** Binary classification (Spam / Ham)  
- **Training:** From scratch, small dataset (~5,500 messages)  

> ⚠️ Note: The dataset is intentionally small to keep things simple.  
> You are encouraged to **fork the repo, add more data, and fine-tune the model**.

---

## 📂 Repository Structure

```

.
├── spam_nn.pth        # Trained PyTorch model weights
├── vectorizer.pkl     # CountVectorizer for text preprocessing
├── model.py           # Neural network architecture
├── config.json        # Model configuration
├── inference.py       # Inference / prediction script
├── README.md          # Documentation

````

---

## 🚀 Usage

### Load Model

```python
import torch
from model import SpamNN
import pickle

# Load model architecture + weights
model = SpamNN()
model.load_state_dict(torch.load("spam_nn.pth"))
model.eval()

# Load vectorizer
with open("vectorizer.pkl", "rb") as f:
    vectorizer = pickle.load(f)
````

### Predict Messages

```python
def predict(text):
    vec = vectorizer.transform([text]).toarray()
    vec = torch.tensor(vec, dtype=torch.float32)
    
    with torch.no_grad():
        output = model(vec)
    
    return "Spam" if output.item() > 0.35 else "Ham"

# Example
print(predict("Congratulations! You won $1000. Click now!"))
```

---

## 🔧 Training & Fine-Tuning

The model can be **improved and fine-tuned** by:

* Adding more data (larger SMS datasets)
* Increasing n-grams (`ngram_range=(1,2)`)
* Adjusting class weights in `BCEWithLogitsLoss`
* Training with more epochs
* Using embeddings or LSTM for contextual understanding

💡 **Fork this repo and experiment freely**. Make it your own!

---

## 🌟 Support the Project

If this project is helpful:

⭐ **Give this repository a star**
🍴 **Fork it and improve it**
📢 **Share it with others learning PyTorch**

> Following and starring helps me keep releasing open-source projects!

---

## 📌 Source Code & Updates

For the **full source code, training scripts, and future updates**,
please visit the **GitHub repository** linked to this project.

---

## 📜 License

This project is **open-source** and intended for **educational purposes**.
MIT License applies.

---

## 🤗 Hugging Face Friendly

You can also **upload this model to Hugging Face Model Hub**.
Include `spam_nn.pth`, `vectorizer.pkl`, `config.json`, and `inference.py` to make it **ready for inference online**.