app.py

import gradio as gr
from datasets import load_dataset
from sklearn.feature_extraction.text import TfidfVectorizer
from sklearn.naive_bayes import MultinomialNB
from sklearn.pipeline import make_pipeline
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score

# 1. Load dataset
dataset = load_dataset("ucirvine/sms_spam", split="train")
texts = dataset["sms"]
labels = [1 if label == "spam" else 0 for label in dataset["label"]]  # spam=1, ham=0

# 2. Train/test split
X_train, X_test, y_train, y_test = train_test_split(texts, labels, test_size=0.2, random_state=42)

# 3. Create model pipeline (TF-IDF + Naive Bayes)
model = make_pipeline(TfidfVectorizer(), MultinomialNB())
model.fit(X_train, y_train)

# 4. Accuracy for reference
y_pred = model.predict(X_test)
print("Validation Accuracy:", accuracy_score(y_test, y_pred))

# 5. Gradio interface
def predict_spam(message):
    pred = model.predict([message])[0]
    return "📩 Not Spam (Ham)" if pred == 0 else "🚫 Spam"

iface = gr.Interface(
    fn=predict_spam,
    inputs=gr.Textbox(lines=4, label="Enter your SMS message"),
    outputs=gr.Text(label="Prediction"),
    title="📬 SMS Spam Detector",
    description="Classifies whether an SMS message is spam or not using a Naive Bayes model."
)

if __name__ == "__main__":
    iface.launch(share=False)