app.py

import gradio as gr
import torch
from transformers import AutoTokenizer, AutoModelForSequenceClassification

# Define the model path (Update this with your fine-tuned model's path or Hugging Face repo)
MODEL_PATH = "your-huggingface-username/your-fine-tuned-model"

# Authenticate if using a private model (Uncomment and set your token)
# TOKEN = "your_hf_access_token"

# Load Model & Tokenizer
try:
    tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH)  # , use_auth_token=TOKEN if needed
    model = AutoModelForSequenceClassification.from_pretrained(MODEL_PATH)  # , use_auth_token=TOKEN if needed
except Exception as e:
    print(f"Error loading model: {e}")
    exit()

# Label Mapping
LABEL_MAPPING = {
    0: "Contract",
    1: "Invoice",
    2: "Financial Report",
    3: "Legal Notice",
    4: "Marketing Material"
}

# Classification Function
def classify_text(text):
    inputs = tokenizer(text, return_tensors="pt", truncation=True, padding=True, max_length=512)

    with torch.no_grad():
        outputs = model(**inputs)

    # Convert logits to probabilities
    probs = torch.nn.functional.softmax(outputs.logits, dim=1)
    
    # Get top predicted label
    label_idx = torch.argmax(probs, dim=1).item()
    confidence = probs[0][label_idx].item()
    
    # Retrieve category name
    category = LABEL_MAPPING.get(label_idx, "Unknown")

    return f"Predicted Category: {category} (Confidence: {confidence:.2f})"

# Gradio UI
demo = gr.Interface(
    fn=classify_text, 
    inputs=gr.Textbox(lines=4, placeholder="Enter business document text..."), 
    outputs="text", 
    title="Multilingual Business Document Classifier"
)

# Run the app
if __name__ == "__main__":
    demo.launch()