Update app.py

app.py

@@ -2,7 +2,7 @@ import os
 import numpy as np
 import pandas as pd
 import requests
-from functools import lru_cache
+from collections import defaultdict
 from typing import Dict, List
 
 import gradio as gr
@@ -10,6 +10,7 @@ from ahocorapy.keywordtree import KeywordTree
 from sentence_transformers import SentenceTransformer
 from FlagEmbedding import FlagModel
 
+
 CSV_PATH  = os.environ.get("CORPUS_CSV", "H_and_M_FINAL.csv")  # pre‑indexed corpus
 TEXT_COL  = os.environ.get("TEXT_COLUMN", "text")       # column with passage text
 IMAGE_COL = os.environ.get("IMAGE_URL_COLUMN", "image_url")  # optional image column