code: def _gen_orders(self, inst, date, pos) -> pd.DataFrame:
      headers = [
          "datetime",
          "instrument",
          "amount",
          "direction",
      ]
      orders = [
          [date, inst, pos, "sell"],
      ]
      return pd.DataFrame(orders, columns=headers)
  
file_path: qlib/tests/backtest/test_high_freq_trading.py
imports: from typing import List, Tuple, Union
  from qlib.backtest.position import Position
  from qlib.backtest import collect_data, format_decisions
  from qlib.backtest.decision import BaseTradeDecision, TradeRangeByTime
  import qlib
  from qlib.tests import TestAutoData
  import unittest
  import pandas
label_desc: Use image node_id 2 for calling the TestHFBacktest obj's underlying member method code with example usage: obj._gen_orders(inst, date, pos) and returns: pd