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app.py
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import re
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import numpy as np
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from typing import Dict
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import gradio as gr
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from fastapi import FastAPI
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from sentence_transformers import SentenceTransformer
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from sklearn.metrics.pairwise import cosine_similarity
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# -------------------------
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# CONFIG
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# -------------------------
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MODEL_NAME = "sentence-transformers/all-MiniLM-L6-v2"
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CONFIDENCE_THRESHOLD = 0.35
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# -------------------------
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# LOAD MODEL
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# -------------------------
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embedder = SentenceTransformer(MODEL_NAME)
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# -------------------------
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# RULE-BASED ROUTER
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# -------------------------
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GREETINGS = {
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"hi", "hello", "hey", "yo", "sup", "hola", "hii", "hai"
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}
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IMAGE_KEYWORDS = {
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"draw", "image", "picture", "photo", "generate image", "create image"
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}
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CODE_KEYWORDS = {
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"code", "python", "javascript", "bug", "error", "compile", "program"
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}
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def rule_based_route(text: str):
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t = text.lower().strip()
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if t in GREETINGS:
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return "chat"
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if any(k in t for k in IMAGE_KEYWORDS):
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return "image_generation"
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if any(k in t for k in CODE_KEYWORDS):
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return "code"
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return None # fallback to semantic router
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# -------------------------
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# SEMANTIC INTENTS
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# -------------------------
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INTENTS: Dict[str, str] = {
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"chat": "casual conversation, greetings, talking",
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"search": "asking for information or facts",
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"image_generation": "requesting image creation or visual generation",
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"code": "programming, software development, debugging",
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"research": "deep technical or academic research",
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"study": "learning, studying, explanations, tutorials",
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"project": "building, planning, or creating a project",
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"action": "asking the system to perform an action"
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}
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INTENT_NAMES = list(INTENTS.keys())
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INTENT_EMBEDDINGS = embedder.encode(list(INTENTS.values()), normalize_embeddings=True)
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# -------------------------
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# SEMANTIC ROUTER
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# -------------------------
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def semantic_route(text: str):
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text_emb = embedder.encode([text], normalize_embeddings=True)
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sims = cosine_similarity(text_emb, INTENT_EMBEDDINGS)[0]
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scores = dict(zip(INTENT_NAMES, sims))
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top_intent = max(scores, key=scores.get)
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confidence = scores[top_intent]
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if confidence < CONFIDENCE_THRESHOLD:
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return "chat", scores # safe fallback
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return top_intent, scores
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# -------------------------
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# MAIN ROUTER
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# -------------------------
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def route_intent(text: str):
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# 1️⃣ Rule-based (instant)
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rule = rule_based_route(text)
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if rule:
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return {
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"text": text,
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"top_intent": rule,
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"method": "rule",
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"scores": {rule: 1.0}
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}
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# 2️⃣ Semantic
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intent, scores = semantic_route(text)
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return {
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"text": text,
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"top_intent": intent,
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"method": "semantic",
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"scores": scores
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}
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# -------------------------
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# FASTAPI
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# -------------------------
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api = FastAPI()
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@api.post("/classify")
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def classify(payload: Dict):
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text = payload.get("text", "")
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return route_intent(text)
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# -------------------------
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# GRADIO UI
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# -------------------------
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def gradio_classify(text):
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result = route_intent(text)
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return result
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gradio_ui = gr.Interface(
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fn=gradio_classify,
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inputs=gr.Textbox(label="User Input"),
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outputs=gr.JSON(label="Classification Result"),
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title="🧠 Hybrid Intent Router",
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description="Rule-based + Semantic intent classification for prompt routing & MPC selection"
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)
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# -------------------------
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# MOUNT GRADIO INTO FASTAPI
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# -------------------------
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app = gr.mount_gradio_app(api, gradio_ui, path="/")
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