Update app.py

app.py

@@ -1,5 +1,4 @@
 from fastapi import FastAPI, Request
-from fastapi.responses import HTMLResponse, StreamingResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 import chess
@@ -7,7 +6,6 @@ from datasets import load_dataset
 import pickle
 import time
 from pyroaring import BitMap
-import json
 
 def board_to_tokens(board):
     return [(board.piece_at(sq).symbol(), chess.square_name(sq)) for sq in chess.SQUARES if board.piece_at(sq)]