import gradio as gr
from sentence_transformers import CrossEncoder

# Load and optimize the model
model = CrossEncoder(
    "jinaai/jina-reranker-v1-tiny-en", 
    trust_remote_code=True
)

# Function to rerank documents
def rerank(query, documents):
    documents = documents.split("&&&")  # Use special delimiter
    inputs = [[query, doc] for doc in documents if doc.strip()]
    scores = model.predict(inputs)
    ranked_docs = sorted(zip(documents, scores), key=lambda x: x[1], reverse=True)
    return [{"document": doc, "score": round(score, 4)} for doc, score in ranked_docs]

# Gradio Interface
iface = gr.Interface(
    fn=rerank,
    inputs=["text", gr.Textbox(label="Documents (Separate with &&&)", placeholder="Doc1 &&& Doc2 &&& Doc3")], 
    outputs="json",
    title="JinaAI v2 Reranker API (Optimized)",
    description="Enter a query and documents (separated by '&&&'). The model will rank them based on relevance.",
)

iface.launch()