Files
kis_bot/kis_trader/backtest/optuna_scalping.py
Your Name 1387fbdf47 feat(옵투나): score·min_trades·후처리 재탐색 및 웹 job 개선
PnL/(MDD+ADD) score·legacy 정렬·거래일×min_trades 게이트를 공통화한다.
후처리 ob_modes·study store·4전략 TPE 순차 스크립트와 문서를 갱신한다.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-08-28 16:46:27 +09:00

640 lines
24 KiB
Python

#!/usr/bin/env python3
"""kis_trader/backtest/optuna_scalping.py — 스캘핑(Reversal) Optuna (Grid add-on)."""
from __future__ import annotations
import json
import logging
import os
import time
from dataclasses import dataclass, field
from datetime import datetime
from typing import Any, Dict, List, Optional
import optuna
from optuna.samplers import RandomSampler, TPESampler
from database import TradeDB
from kis_trader.backtest import scalping_backtest_common as sbc
from kis_trader.backtest.breakout_tick_loader import (
load_breakout_ticks_by_code,
tick_coverage_stats,
)
from kis_trader.backtest.optuna_search_space import scalp_grid_axis_keys, suggest_scalp_params
from kis_trader.backtest.optuna_scalping_tpe_space import (
scalp_tpe_axis_keys,
suggest_scalp_params_tpe,
)
from kis_trader.backtest.optuna_mode_combo import enrich_out_data_with_mode_combo
from kis_trader.backtest.optuna_common import (
announce_optuna_json_path,
build_optuna_result_tiers,
pick_gated_apply_trial,
release_shared_tick_store,
set_optuna_trial_stability_attrs,
stability_fields_from_trial_attrs,
)
from kis_trader.backtest.param_search_cli_common import (
apply_session_to_fixed,
combo_passes_search_filters,
format_session_hm,
)
from kis_trader.backtest.param_search_scalping import (
SCALP_GRID_AXIS_HINTS_KO,
_fixed_defaults,
_load_candles_for_search,
_scalp_grids,
_ui_to_engine_params,
apply_params_to_db,
evaluate_scalp_param_combo,
)
from kis_trader.backtest.tail_param_search import _results_dir_for_write
from kis_trader.engine import scalping_engine as se
from kis_trader.engine.indicator_cache import attach_indicator_caches_to_params
from kis_trader.utils.env import get_env_bool, get_env_float
logger = logging.getLogger("param_search_optuna")
_FAIL_OBJECTIVE = -1e18
@dataclass
class ScalpSearchContext:
start: str
end: str
mode: str
base_fixed: Dict[str, Any]
codes_candles: Dict[str, List[Dict]]
universe_by_slot: Optional[Dict[str, List[str]]]
universe_source: str
fee_rate: float
sell_tax: float
slot_money: float
max_stocks: int
total_budget_krw: float
period_days: int
portfolio: Dict[str, Any]
grid_keys: List[str]
start_key: str = ""
end_key: str = ""
ticks_by_code: Any = None
tick_rows: int = 0
tick_backtest_meta: Dict[str, Any] = field(default_factory=dict)
cache_holder: Dict[str, Any] = field(default_factory=dict)
shared_tick_store: Any = None # ws_ticks 공유메모리 핸들 (종료 시 unlink)
orderbook_by_code: Dict[str, Any] = field(default_factory=dict)
program_by_code: Dict[str, Any] = field(default_factory=dict)
orderbook_filter: str = "off"
def prepare_scalp_search_context(
start: str,
end: str,
mode: str,
*,
use_fallback_universe: bool = False,
time_start_hm: Optional[int] = None,
time_end_hm: Optional[int] = None,
slot_money: Optional[float] = None,
max_stocks: Optional[int] = None,
total_budget_krw: Optional[float] = None,
orderbook_filter: str = "off",
history_source: Optional[str] = None,
) -> Optional[ScalpSearchContext]:
grids = _scalp_grids()
if mode == "tpe":
grid_axes: Dict[str, Any] = {}
logger.info(
"📌 mode=tpe — 연속(float/int) 탐색 (Grid categorical 미사용, TPE 가 구간 축소)"
)
elif mode not in grids:
logger.error(
"❌ 스캘핑 mode: %s (fast/trigger/exit/coarse/fine/full/wide/tpe)", mode,
)
return None
else:
grid_axes = grids[mode]
base_fixed = _fixed_defaults()
if mode == "tpe":
base_fixed["skip_hts_scan_dupes"] = False
apply_session_to_fixed(base_fixed, time_start_hm=time_start_hm, time_end_hm=time_end_hm)
_ob_mode = (orderbook_filter or "off").strip().lower()
if _ob_mode == "off":
base_fixed["_orderbook_filter_enabled"] = False
elif _ob_mode == "on":
base_fixed["_orderbook_filter_enabled"] = True
from kis_trader.backtest.optuna_tpe_common import optuna_tpe_needs_orderbook_feed
# TPE+호가축: CLI off 여도 스냅 로드. trial 이 _orderbook_filter_enabled 로 ON/OFF.
need_ob_feed = optuna_tpe_needs_orderbook_feed(mode, _ob_mode)
ob_filter_on = bool(base_fixed.get("_orderbook_filter_enabled")) or _ob_mode == "auto" or need_ob_feed
logger.info(
"📌 호가필터: %s (%s)%s",
_ob_mode.upper(),
"스냅로드" if need_ob_feed else ("적용" if ob_filter_on else "스킵 — 코어 파라미터 순수 탐색"),
" · TPE 호가축" if (mode == "tpe" and need_ob_feed) else "",
)
db = TradeDB()
try:
from kis_trader.backtest.backtest_portfolio_common import load_portfolio_env_row
env_row = load_portfolio_env_row(db)
finally:
db.close()
fee_rate, sell_tax, slot_from_env = sbc.fee_and_slot_from_env(env_row, strategy="SCALP")
portfolio = sbc.resolve_scalp_portfolio_params(
env_row, None, strategy="SCALP",
slot_money=slot_money if slot_money is not None else slot_from_env,
max_stocks=max_stocks,
total_budget_krw=total_budget_krw,
)
slot_money_f = float(portfolio["slot_money"])
max_stocks_i = int(portfolio["max_stocks"])
total_budget_f = float(portfolio["total_budget_krw"])
period_days = max(
1,
(datetime.strptime(end, "%Y-%m-%d") - datetime.strptime(start, "%Y-%m-%d")).days + 1,
)
logger.info(
"💼 포트폴리오: 1회 %s원 | 동시 %d종 | 총한도 %s원 | 매매 %s",
f"{slot_money_f:,.0f}", max_stocks_i, f"{total_budget_f:,.0f}",
format_session_hm(base_fixed),
)
# grid_axes 는 상단에서 mode별 설정 (tpe=빈 dict). grids[mode] 재조회 금지.
rsi_cands = grid_axes.get("rsi_period") or [base_fixed.get("rsi_period") or 7]
try:
rsi_period = max(int(float(x)) for x in rsi_cands)
except (TypeError, ValueError):
rsi_period = int(base_fixed.get("rsi_period") or 7)
if mode == "tpe":
# TPE 상한까지 RSI 로드 (3~14)
rsi_period = max(rsi_period, 14)
from kis_trader.backtest.universe_history_source import (
resolve_backtest_universe_history_source,
)
_hs = resolve_backtest_universe_history_source(history_source)
base_fixed["_universe_history_source"] = _hs
try:
from kis_trader.backtest.optuna_feed_trace import log_bt_feed_chain_banner
log_bt_feed_chain_banner(context="Optuna-SCALP")
except Exception:
pass
codes_candles = _load_candles_for_search(
start, end, rsi_period, history_source=_hs,
)
if not codes_candles:
logger.error("❌ 캔들 데이터 없음")
return None
logger.info("✅ 데이터 로드: %s종목 (history=%s)", len(codes_candles), _hs)
# ── 틱재생 — history_source=ls 이면 ls_ws_ticks ──
start_key = (start.replace("-", "") + "0000") if start else "202601010000"
end_key = (end.replace("-", "") + "2359") if end else "999912312359"
ticks_by_code: Dict[str, Any] = {}
tick_rows = 0
tick_backtest_meta: Dict[str, Any] = {}
engine_probe = _ui_to_engine_params(base_fixed)
engine_probe["backtest_tick_fallback_ohlc"] = False
base_fixed["backtest_tick_fallback_ohlc"] = False
if sbc._scalp_backtest_wants_ticks(engine_probe):
_tick_db = TradeDB()
try:
if _hs in ("ls", "ls_condition", "ls_ws"):
from kis_trader.backtest.ls_history_loaders import load_ls_ticks_by_code
ticks_by_code, tick_rows = load_ls_ticks_by_code(
_tick_db, start_key, end_key, set(codes_candles.keys()),
)
_tick_lbl = "ls_ws_ticks"
else:
ticks_by_code, tick_rows = load_breakout_ticks_by_code(
_tick_db, start_key, end_key, set(codes_candles.keys()),
)
_tick_lbl = "ws_ticks"
tick_backtest_meta = tick_coverage_stats(codes_candles, ticks_by_code)
tick_backtest_meta["ws_tick_rows_loaded"] = tick_rows
tick_backtest_meta["tick_table"] = _tick_lbl
cov = tick_backtest_meta.get("tick_bar_coverage_pct", 0)
logger.info(
"%s %s건 | 분봉 커버리지 %s%% (%s/%s종목)",
_tick_lbl,
f"{tick_rows:,}",
cov,
tick_backtest_meta.get("tick_codes_with_data", 0),
tick_backtest_meta.get("tick_codes_total", 0),
)
if tick_rows <= 0:
logger.warning(
"⚠️ ws_ticks 없음 — SCALP Optuna 가 OHLC만 사용 "
"(틱 수집 후 재탐색, FALLBACK_OHLC 기본 OFF)"
)
else:
_fb = get_env_bool("SCALP_BACKTEST_TICK_FALLBACK_OHLC", False)
logger.info(
"📌 틱재생(ws_ticks): ON — OHLC 폴백 %s",
"ON" if _fb else "OFF",
)
finally:
_tick_db.close()
shared_tick_store = None
if get_env_bool("OPTUNA_PARAM_SEARCH_SHARED_TICKS", True) and ticks_by_code:
from kis_trader.backtest.shared_ticks import build_shared_ticks_view
_view, shared_tick_store = build_shared_ticks_view(ticks_by_code, enabled=True)
if shared_tick_store is not None:
import atexit as _atexit
_atexit.register(shared_tick_store.unlink)
logger.info("📦 ws_ticks 공유메모리 ON (Optuna) — dict 사본 제거, RAM 절감")
ticks_by_code = _view
import gc as _gc
_gc.collect()
try:
import ctypes as _ctypes
_ctypes.CDLL("libc.so.6").malloc_trim(0)
except Exception:
pass
start_ymd = start.replace("-", "") if start else ""
end_ymd = end.replace("-", "") if end else ""
universe_by_slot = None
universe_source = "sim"
fallback_sim_interval = 5
if not use_fallback_universe and start_ymd and end_ymd:
history, src, n_slots, scan_iv = sbc.resolve_scalp_universe(
start_ymd, end_ymd, use_saved_history=True, strategy_id="SCALP",
history_source=_hs,
)
if history:
universe_by_slot = history
universe_source = src
base_fixed["scan_interval_min"] = scan_iv
avg = sum(len(v) for v in history.values()) / max(1, n_slots)
logger.info(
"✅ 유니버스: SCALP 이력 src=%s | %d슬롯 · 평균 %.1f종목",
src, n_slots, avg,
)
if universe_by_slot is None:
universe_top_n = int(os.environ.get("UPDATE_UNIVERSE_TOP_N", "20"))
universe_min_score = float(os.environ.get("UPDATE_UNIVERSE_MIN_SCORE", "4.0"))
universe_by_slot = se.build_universe_simulation(
codes_candles,
top_n=universe_top_n,
min_score=universe_min_score,
scan_interval_min=fallback_sim_interval,
)
base_fixed["scan_interval_min"] = fallback_sim_interval
universe_source = "sim"
logger.info("📌 유니버스: 개미털기 시뮬 fallback (%d분)", fallback_sim_interval)
else:
base_fixed["scan_interval_min"] = 1
cache_holder: Dict[str, Any] = {}
attach_indicator_caches_to_params(cache_holder, codes_candles)
# 호가·프로그램 스냅샷 (필터 ON + 그리드 스윕/재생용)
orderbook_by_code: Dict[str, Any] = {}
program_by_code: Dict[str, Any] = {}
_ob_axes = ("max_spread_pct", "min_bid_ask_ratio", "ask_max_mult")
_ob_sweeping = any(len(set(grid_axes.get(k) or [])) > 1 for k in _ob_axes)
if need_ob_feed or ob_filter_on:
from kis_trader.backtest.trigger_snapshot_loader import load_trigger_snapshots_by_code
_ob_db = TradeDB()
try:
engine_probe["_orderbook_filter_enabled"] = True
orderbook_by_code, program_by_code, trigger_snap_meta = load_trigger_snapshots_by_code(
_ob_db, start_key, end_key, set(codes_candles.keys()),
engine_params=engine_probe, strategy="SCALP",
)
ob_rows = int(trigger_snap_meta.get("ws_orderbook_rows_loaded") or 0)
pg_rows = int(trigger_snap_meta.get("ws_program_rows_loaded") or 0)
logger.info(
"✅ TRIGGER 스냅샷 ws_orderbook %s건 | ws_program %s%s",
f"{ob_rows:,}", f"{pg_rows:,}",
" (호가축 스윕)" if _ob_sweeping else "",
)
if ob_rows <= 0:
logger.warning(
"⚠️ ws_orderbook 거의 없음 — 호가필터 ON 이어도 스냅샷 없으면 통과(미차단). "
"수집 늘린 뒤 재탐색 권장."
)
finally:
_ob_db.close()
return ScalpSearchContext(
start=start,
end=end,
mode=mode,
base_fixed=base_fixed,
codes_candles=codes_candles,
universe_by_slot=universe_by_slot,
universe_source=universe_source,
fee_rate=fee_rate,
sell_tax=sell_tax,
slot_money=slot_money_f,
max_stocks=max_stocks_i,
total_budget_krw=total_budget_f,
period_days=period_days,
portfolio=portfolio,
grid_keys=scalp_tpe_axis_keys() if mode == "tpe" else scalp_grid_axis_keys(mode),
start_key=start_key,
end_key=end_key,
ticks_by_code=ticks_by_code,
tick_rows=int(tick_rows),
tick_backtest_meta=tick_backtest_meta,
cache_holder=cache_holder,
shared_tick_store=shared_tick_store,
orderbook_by_code=orderbook_by_code,
program_by_code=program_by_code,
orderbook_filter=_ob_mode,
)
def _make_sampler(name: str, seed: Optional[int]):
n = (name or "tpe").strip().lower()
if n == "random":
return RandomSampler(seed=seed)
# multivariate TPE + 조건부 suggest 시 independent sampling 경고가 trial마다 폭주 → 억제
return TPESampler(seed=seed, multivariate=True, warn_independent_sampling=False)
def _scalp_objective_value(
result: Dict[str, Any],
sort_by: str,
*,
start: Any = None,
end: Any = None,
) -> float:
from kis_trader.backtest.optuna_common import optuna_objective_value
return float(optuna_objective_value(
result, sort_by, start=start, end=end, strategy="scalp",
))
def run_scalp_optuna(
ctx: ScalpSearchContext,
*,
n_trials: int,
storage_url: str,
study_name: str,
min_trades: int,
min_win_rate: float,
min_pf: float,
sort_by: str = "score",
sampler_name: str = "tpe",
seed: Optional[int] = None,
n_jobs: int = 1,
show_progress: bool = True,
) -> optuna.Study:
study = optuna.create_study(
study_name=study_name,
storage=storage_url,
load_if_exists=True,
direction="maximize",
sampler=_make_sampler(sampler_name, seed),
)
from kis_trader.backtest.optuna_study_store import (
bind_study_trials,
clamp_optimize_n_trials,
finalize_optuna_export,
make_study_goal_stop_callback,
)
bind_study_trials(study, n_trials=n_trials, log=logger)
n_trials = clamp_optimize_n_trials(study, n_trials, log=logger)
def objective(trial: optuna.Trial) -> float:
if ctx.mode == "tpe":
combo = suggest_scalp_params_tpe(trial)
else:
combo = suggest_scalp_params(trial, ctx.mode)
result = evaluate_scalp_param_combo(
combo,
base_fixed=ctx.base_fixed,
grid_keys=ctx.grid_keys,
codes_candles=ctx.codes_candles,
min_trades=min_trades,
min_win_rate=min_win_rate,
min_pf=min_pf,
universe_by_slot=ctx.universe_by_slot,
slot_money=ctx.slot_money,
max_stocks=ctx.max_stocks,
total_budget_krw=ctx.total_budget_krw,
fee_rate=ctx.fee_rate,
sell_tax=ctx.sell_tax,
period_days=ctx.period_days,
cache_holder=ctx.cache_holder,
ticks_by_code=ctx.ticks_by_code,
orderbook_by_code=ctx.orderbook_by_code,
program_by_code=ctx.program_by_code,
start_key=ctx.start_key,
end_key=ctx.end_key,
)
if result is None:
trial.set_user_attr("gates_ok", False)
return _FAIL_OBJECTIVE
trial.set_user_attr("gates_ok", True)
trial.set_user_attr("total_pnl", float(result["total_pnl"]))
trial.set_user_attr("win_rate", float(result["win_rate"]))
trial.set_user_attr("pf", float(result.get("pf") or 0))
trial.set_user_attr("mdd", float(result.get("mdd") or 0))
trial.set_user_attr("total_trades", int(result["total_trades"]))
trial.set_user_attr(
"merged_json",
json.dumps(result.get("merged_params") or {}, ensure_ascii=False),
)
from kis_trader.backtest.optuna_common import optuna_store_trial_score_user_attrs
set_optuna_trial_stability_attrs(trial, result)
return optuna_store_trial_score_user_attrs(
trial, result, sort_by, start=ctx.start, end=ctx.end, strategy="scalp",
)
logger.info(
"🔬 Optuna SCALP | study=%s | mode=%s | trials=%d | sort=%s | universe=%s | ticks=%s",
study_name, ctx.mode, n_trials, sort_by, ctx.universe_source,
f"{ctx.tick_rows:,}",
)
t0 = time.time()
try:
if n_trials <= 0:
logger.info("📌 추가 trial 없음 — 기존 study 결과만 정리")
else:
study.optimize(
objective,
n_trials=n_trials,
n_jobs=n_jobs,
show_progress_bar=show_progress,
callbacks=[make_study_goal_stop_callback(logger)],
)
elapsed = time.time() - t0
from kis_trader.backtest.optuna_common import optuna_score_fields_from_trial
passing: List[Dict[str, Any]] = []
for trial in study.trials:
if trial.state != optuna.trial.TrialState.COMPLETE:
continue
if not trial.user_attrs.get("gates_ok"):
continue
merged_raw = trial.user_attrs.get("merged_json") or "{}"
try:
merged = json.loads(merged_raw)
except json.JSONDecodeError:
merged = dict(trial.params)
row = {
"params": dict(trial.params),
"merged_params": merged,
"total_trades": int(trial.user_attrs.get("total_trades") or 0),
"win_rate": float(trial.user_attrs.get("win_rate") or 0),
"total_pnl": float(trial.user_attrs.get("total_pnl") or 0),
"pf": float(trial.user_attrs.get("pf") or 0),
"mdd": float(trial.user_attrs.get("mdd") or 0),
**optuna_score_fields_from_trial(trial),
"period_daily_avg_pnl": float(trial.user_attrs.get("period_daily_avg_pnl") or 0),
"optuna_trial_number": trial.number,
}
row.update(stability_fields_from_trial_attrs(trial))
passing.append(row)
from kis_trader.backtest.optuna_common import _sort_optuna_rows
passing = _sort_optuna_rows(passing, sort_by)
tiers = build_optuna_result_tiers(passing, sort_by=sort_by)
out_data = {
"engine": "optuna",
"strategy": "scalp",
"mode": ctx.mode,
"start": ctx.start,
"end": ctx.end,
"universe_source": ctx.universe_source,
"slot_money": int(ctx.slot_money),
"max_stocks": ctx.max_stocks,
"total_budget_krw": int(ctx.total_budget_krw),
"backtest_days": ctx.period_days,
"min_trades": min_trades,
"min_win_rate": min_win_rate,
"min_pf": min_pf,
"sort_by": sort_by,
"grid_keys": ctx.grid_keys,
"grid_axis_hints": {
k: SCALP_GRID_AXIS_HINTS_KO[k]
for k in ctx.grid_keys if k in SCALP_GRID_AXIS_HINTS_KO
},
"optuna_study_name": study_name,
"optuna_storage": storage_url,
"optuna_n_trials_requested": n_trials,
"optuna_trials_completed": len(study.trials),
"optuna_best_value": study.best_value if study.best_trial else None,
"optuna_best_trial_number": study.best_trial.number if study.best_trial else None,
"elapsed_sec": round(elapsed, 1),
"ws_tick_rows_loaded": int(ctx.tick_rows),
"tick_backtest": ctx.tick_backtest_meta,
**tiers,
}
from kis_trader.backtest.optuna_common import annotate_optuna_period_daily_avg
annotate_optuna_period_daily_avg(out_data)
ts = datetime.now().strftime("%Y%m%d_%H%M%S")
out_path = os.path.join(_results_dir_for_write(), f"optuna_scalp_{ctx.mode}_{ts}.json")
with open(out_path, "w", encoding="utf-8") as f:
json.dump(out_data, f, indent=2, ensure_ascii=False)
announce_optuna_json_path(
out_path, strategy="scalp", mode=ctx.mode, note="중간저장(mode 전)", log=logger,
)
def _eval_mode(combo: Dict[str, Any]) -> Optional[Dict[str, Any]]:
return evaluate_scalp_param_combo(
combo,
base_fixed=ctx.base_fixed,
grid_keys=ctx.grid_keys,
codes_candles=ctx.codes_candles,
min_trades=1,
min_win_rate=0.0,
min_pf=0.0,
universe_by_slot=ctx.universe_by_slot,
slot_money=ctx.slot_money,
max_stocks=ctx.max_stocks,
total_budget_krw=ctx.total_budget_krw,
fee_rate=ctx.fee_rate,
sell_tax=ctx.sell_tax,
period_days=ctx.period_days,
cache_holder=ctx.cache_holder,
ticks_by_code=ctx.ticks_by_code,
orderbook_by_code=ctx.orderbook_by_code,
program_by_code=ctx.program_by_code,
start_key=ctx.start_key,
end_key=ctx.end_key,
include_trades=True,
)
def _save_partial(_data: Dict[str, Any]) -> None:
with open(out_path, "w", encoding="utf-8") as f:
json.dump(_data, f, indent=2, ensure_ascii=False)
announce_optuna_json_path(
out_path, strategy="scalp", mode=ctx.mode, note="mode_combo params 저장(실측 전)", log=logger,
)
def _enrich() -> None:
enrich_out_data_with_mode_combo(
out_data,
evaluate_fn=_eval_mode,
grid_keys=ctx.grid_keys,
log=logger,
on_partial_save=_save_partial,
)
with open(out_path, "w", encoding="utf-8") as f:
json.dump(out_data, f, indent=2, ensure_ascii=False)
announce_optuna_json_path(
out_path, strategy="scalp", mode=ctx.mode, note="최종 JSON", log=logger,
)
finalize_optuna_export(
study,
out_data=out_data,
out_path=out_path,
strategy="scalp",
mode=ctx.mode,
enrich_fn=_enrich,
log=logger,
)
study._kis_export_path = out_path # type: ignore[attr-defined]
return study
finally:
release_shared_tick_store(ctx, log=logger)
def apply_best_scalp_trial(study: optuna.Study) -> bool:
trial = pick_gated_apply_trial(study, sort_by="score", fail_objective=_FAIL_OBJECTIVE)
if trial is None:
logger.warning(
"⚠️ 사후게이트(results_gated) 통과 trial 없음 — DB 미적용"
)
return False
pnl = float(trial.user_attrs.get("total_pnl") or 0)
if pnl <= 0:
logger.warning("⚠️ gated trial 총손익 ≤ 0 — DB 미적용")
return False
merged_raw = trial.user_attrs.get("merged_json") or "{}"
merged = json.loads(merged_raw)
apply_params_to_db(merged)
logger.info("🚀 [Optuna apply-best] scalp gated trial #%d → env_config", trial.number)
try:
from kis_trader.backtest.optuna_daily_trail_recommend import (
apply_daily_trail_recommend_from_optuna_json,
)
apply_daily_trail_recommend_from_optuna_json(
getattr(study, "_kis_export_path", None),
strategy="scalp",
log=logger,
)
except Exception as exc:
logger.warning("⚠️ 다단트레일 추천 반영 스킵: %s", exc)
return True