start experiment 57 (exp/57-signal-quality-gate-gate-trades-based-on)

code/tac-qlib/tac_qlib/contrib/strategy/__init__.py

@@ -0,0 +1,11 @@
+from .ic_gate import ICGateTopkDropoutStrategy  # noqa: F401
+from .optimal_stop import OptimalStopControl  # noqa: F401
+from .regime_gate import RegimeGateTopkDropoutStrategy  # noqa: F401
+from .weekly_rebalance import WeeklyRebalanceDropoutStrategy  # noqa: F401
+
+__all__ = [
+    "ICGateTopkDropoutStrategy",
+    "OptimalStopControl",
+    "RegimeGateTopkDropoutStrategy",
+    "WeeklyRebalanceDropoutStrategy",
+]

code/tac-qlib/tac_qlib/contrib/strategy/ic_gate.py

@@ -0,0 +1,117 @@
+"""Realized-IC circuit breaker TopkDropout strategy.
+
+Subclass of ``qlib.contrib.strategy.signal_strategy.TopkDropoutStrategy`` that
+holds the book (issues NO orders) while the streaming realized RankIC of the
+deployed signal is below threshold — i.e. the model's cross-sectional
+predictions are no longer earning against realized forward returns. When the
+gate is open it behaves exactly like the reference TopkDropoutStrategy.
+
+The gate is evaluated per trade step on the trailing mean realized RankIC of
+the signal over the last ``ic_window`` trading days whose label is fully
+realized as of the decision date (no lookahead — a 5d fwd label ``close[t+6]/
+close[t+1]-1`` is only known at ``t+6``).
+
+Two wiring modes:
+
+* ``ic_gate``: a precomputed ``pd.Series`` indexed by datetime of booleans
+  (True = gate open / trade allowed). Computed once by the caller (e.g.
+  ``rd_backtest``) and looked up per step. Missing dates default to open.
+* realized-IC self-computation: when ``ic_min_rankic`` is given but no
+  ``ic_gate``, the strategy computes the per-date realized RankIC itself from
+  ``self.signal`` (the pred scores) and the lake 1d bars via
+  ``tac_qlib.risk_limits.realized_rankic_series``, then applies the same
+  trailing-window comparison. Works when instantiated from a workflow YAML
+  PortAnaRecord config (``lake_root`` / ``market`` must be provided).
+"""
+
+from __future__ import annotations
+
+import pandas as pd
+
+from qlib.backtest.decision import TradeDecisionWO
+from qlib.contrib.strategy.signal_strategy import TopkDropoutStrategy
+
+from tac_qlib.risk_limits import ic_circuit_breaker, realized_rankic_series
+
+__all__ = ["ICGateTopkDropoutStrategy"]
+
+
+class ICGateTopkDropoutStrategy(TopkDropoutStrategy):
+    """TopkDropout with a streaming realized-IC circuit breaker.
+
+    Parameters
+    ----------
+    topk, n_drop, method_sell, method_buy, hold_thresh, only_tradable,
+    forbid_all_trade_at_limit : same as ``TopkDropoutStrategy``.
+    ic_min_rankic : float — pause new trading while trailing realized RankIC is
+        below this threshold (0 disables the gate).
+    ic_window : int — trailing window for the realized RankIC mean (default 22).
+    ic_label_horizon : int — label horizon in trading days (default 6).
+    ic_min_obs : int — min realized labels before the gate arms (default 10).
+    ic_gate : pd.Series, optional — precomputed per-date gate (bool indexed by
+        datetime). When provided, it overrides self-computation.
+    lake_root, market : str — lake location for self-computed realized IC.
+    """
+
+    def __init__(
+        self,
+        *,
+        topk,
+        n_drop,
+        ic_min_rankic: float = 0.0,
+        ic_window: int = 22,
+        ic_label_horizon: int = 6,
+        ic_min_obs: int = 10,
+        ic_gate=None,
+        lake_root: str = "",
+        market: str = "US",
+        **kwargs,
+    ):
+        super().__init__(topk=topk, n_drop=n_drop, **kwargs)
+        self.ic_min_rankic = float(ic_min_rankic or 0.0)
+        self.ic_window = int(ic_window or 22)
+        self.ic_label_horizon = int(ic_label_horizon or 6)
+        self.ic_min_obs = int(ic_min_obs or 10)
+        self._ic_gate = ic_gate
+        self._realized_ic = None
+        self.lake_root = lake_root or ""
+        self.market = market or "US"
+
+    def _load_realized_ic(self):
+        if self._realized_ic is None:
+            pred_start_time, pred_end_time = self.trade_calendar.get_step_time(
+                self.trade_calendar.get_trade_step(), shift=-self.ic_label_horizon
+            )
+            pred = self.signal.get_signal(start_time=pred_start_time, end_time=pred_end_time)
+            if isinstance(pred, pd.DataFrame):
+                pred = pred.iloc[:, 0]
+            self._realized_ic = realized_rankic_series(
+                pred, self.lake_root, self.market, label_horizon=self.ic_label_horizon
+            )
+        return self._realized_ic
+
+    def _gate_open(self, trade_start_time) -> bool:
+        ts = pd.Timestamp(trade_start_time)
+        if self._ic_gate is not None:
+            # precomputed gate series: look up the latest known decision date <= ts
+            known = self._ic_gate[self._ic_gate.index <= ts]
+            if len(known):
+                return bool(known.iloc[-1])
+            return True
+        if self.ic_min_rankic <= 0:
+            return True
+        realized = self._load_realized_ic()
+        limits = {
+            "ic_min_rankic": self.ic_min_rankic,
+            "ic_window": self.ic_window,
+            "ic_min_obs": self.ic_min_obs,
+        }
+        tripped, _reason, _trail = ic_circuit_breaker(realized, ts, limits)
+        return not tripped
+
+    def generate_trade_decision(self, execute_result=None):
+        trade_step = self.trade_calendar.get_trade_step()
+        trade_start_time, _ = self.trade_calendar.get_step_time(trade_step)
+        if not self._gate_open(trade_start_time):
+            return TradeDecisionWO([], self)
+        return super().generate_trade_decision(execute_result)

code/tac-qlib/tac_qlib/contrib/strategy/optimal_stop.py

@@ -0,0 +1,217 @@
+"""Optimal-stopping / stochastic-control strategy for cross-sectional signals.
+
+Entry is a control policy: a symbol opens a position only when its cross-sectional
+signal percentile is at or above ``entry_pct`` (i.e. it is one of the top-ranked
+names) and the portfolio has fewer than ``topk`` open positions.
+
+Exit is an optimal-stopping rule: a held position is stopped (closed) when its
+signal percentile falls below ``exit_pct`` (the continuation value of holding is
+no longer worth the risk), OR after ``max_hold_days`` (time stop / finite
+horizon), OR when the position P&L breaches ``sl`` (loss control) and the
+position has been held at least ``min_hold_days``.
+
+Sizing is fixed ``notional`` per position (equal-weight control), unlike the
+TopkDropout cash-allocation heuristic.
+
+Wired into qrun workflows like any ``BaseStrategy`` (see ``PortAnaRecord``
+config). Mirrors the API usage of qlib's ``TopkDropoutStrategy``: ``Order``/
+``OrderDir`` from ``qlib.backtest.decision``, ``trade_calendar`` /
+``trade_exchange`` / ``trade_position`` injected by the backtest executor.
+"""
+
+from __future__ import annotations
+
+from typing import List
+
+import pandas as pd
+
+from qlib.backtest import Order
+from qlib.backtest.decision import OrderDir, TradeDecisionWO
+from qlib.contrib.strategy.signal_strategy import BaseSignalStrategy
+
+__all__ = ["OptimalStopControl"]
+
+DEFAULT_NOTIONAL = 20_000.0
+DEFAULT_ENTRY_PCT = 0.80
+DEFAULT_EXIT_PCT = 0.50
+DEFAULT_MAX_HOLD_DAYS = 10
+DEFAULT_MIN_HOLD_DAYS = 2
+DEFAULT_SL = -0.06
+
+
+class OptimalStopControl(BaseSignalStrategy):
+    """Optimal-stopping long-only strategy over a cross-sectional signal.
+
+    Parameters
+    ----------
+    topk : max number of concurrent positions.
+    entry_pct : min cross-sectional score percentile required to OPEN (0..1).
+    exit_pct : held positions are stopped when score percentile < exit_pct.
+    max_hold_days : hard time stop (finite-horizon close).
+    min_hold_days : minimum holding days before stop-loss is evaluated.
+    notional : $ per position (equal-weight control).
+    sl : stop-loss threshold as fraction of entry price (<= 0), disabled if 0.
+    """
+
+    def __init__(
+        self,
+        *,
+        signal=None,
+        topk: int = 10,
+        entry_pct: float = DEFAULT_ENTRY_PCT,
+        exit_pct: float = DEFAULT_EXIT_PCT,
+        max_hold_days: int = DEFAULT_MAX_HOLD_DAYS,
+        min_hold_days: int = DEFAULT_MIN_HOLD_DAYS,
+        notional: float = DEFAULT_NOTIONAL,
+        sl: float = DEFAULT_SL,
+        risk_degree: float = 0.95,
+        trade_exchange=None,
+        level_infra=None,
+        common_infra=None,
+        **kwargs,
+    ):
+        super().__init__(
+            signal=signal,
+            trade_exchange=trade_exchange,
+            level_infra=level_infra,
+            common_infra=common_infra,
+            **kwargs,
+        )
+        self.topk = topk
+        self.entry_pct = entry_pct
+        self.exit_pct = exit_pct
+        self.max_hold_days = max_hold_days
+        self.min_hold_days = min_hold_days
+        self.notional = notional
+        self.sl = sl
+
+    # ------------------------------------------------------------------ utils
+    @staticmethod
+    def _pct_rank(score: pd.Series) -> pd.Series:
+        return score.rank(pct=True)
+
+    def _entry_price(self, pos) -> float:
+        # Position stores avg entry price under key "price" (see Position.position)
+        price = pos.position.get("price")
+        if price is None:
+            price = pos.get_stock_amount("price")
+        return float(price)
+
+    def _pnl_pct(self, pos, mark: float) -> float:
+        entry = self._entry_price(pos)
+        if not entry or entry != entry:
+            return 0.0
+        return mark / entry - 1.0
+
+    def _is_tradable(self, code, start, end, direction) -> bool:
+        try:
+            return self.trade_exchange.is_stock_tradable(
+                stock_id=code, start_time=start, end_time=end, direction=direction
+            )
+        except TypeError:  # some exchanges take no direction kwarg
+            return self.trade_exchange.is_stock_tradable(stock_id=code, start_time=start, end_time=end)
+
+    # ------------------------------------------------------------ decision
+    def generate_trade_decision(self, execute_result=None):
+        trade_step = self.trade_calendar.get_trade_step()
+        trade_start, trade_end = self.trade_calendar.get_step_time(trade_step)
+        pred_start, pred_end = self.trade_calendar.get_step_time(trade_step, shift=1)
+        pred_score = self.signal.get_signal(start_time=pred_start, end_time=pred_end)
+        if isinstance(pred_score, pd.DataFrame):
+            pred_score = pred_score.iloc[:, 0]
+        if pred_score is None or len(pred_score) == 0:
+            return TradeDecisionWO([], self)
+
+        pct = self._pct_rank(pred_score)
+        time_per_step = self.trade_calendar.get_freq()
+        current_temp = __import__("copy").deepcopy(self.trade_position)
+
+        holdings = {}
+        for code in current_temp.get_stock_list():
+            if abs(current_temp.get_stock_amount(code)) > 1e-6:
+                holdings[code] = current_temp
+
+        # ---- optimal stopping: close held positions -----------------------
+        sell_orders: List[Order] = []
+        closed_today = set()
+        kept = {}
+        for code, pos in holdings.items():
+            held = current_temp.get_stock_count(code, bar=time_per_step)
+            mark = self.trade_exchange.get_deal_price(
+                stock_id=code, start_time=trade_start, end_time=trade_end, direction=Order.SELL
+            )
+            if mark is None or mark != mark:
+                continue
+            rank = pct.get(code, 0.0)
+            stop_pnl = held >= self.min_hold_days and self.sl < 0 and self._pnl_pct(pos, mark) <= self.sl
+            if held >= self.max_hold_days or rank < self.exit_pct or stop_pnl:
+                amt = abs(current_temp.get_stock_amount(code))
+                o = Order(stock_id=code, amount=amt, start_time=trade_start,
+                          end_time=trade_end, direction=Order.SELL)
+                if self.trade_exchange.check_order(o):
+                    sell_orders.append(o)
+                    self.trade_exchange.deal_order(o, position=current_temp)
+                closed_today.add(code)
+            else:
+                kept[code] = mark
+
+        # ---- equal-weight control: target notional per name -----------------
+        # candidate opens: top-ranked names whose signal pct >= entry_pct
+        rank_desc = pred_score.sort_values(ascending=False)
+        held_codes = set(kept)
+        opens = []
+        for sym in rank_desc.index:
+            if len(opens) >= self.topk:
+                break
+            if sym in held_codes:
+                continue
+            if pct.get(sym, 0.0) < self.entry_pct:
+                continue
+            if not self._is_tradable(sym, trade_start, trade_end, OrderDir.BUY):
+                continue
+            opens.append(sym)
+
+        targets = held_codes | set(opens)
+        if not targets:
+            return TradeDecisionWO(sell_orders, self)
+
+        # total value (cash + marked positions) -> per-target notional
+        total_value = current_temp.get_cash()
+        for code, mark in kept.items():
+            total_value += abs(current_temp.get_stock_amount(code)) * mark
+
+        target_notional = total_value * self.risk_degree / max(1, len(targets))
+
+        # ---- rebalance kept positions toward target weight ------------------
+        buy_orders: List[Order] = []
+        for code, mark in kept.items():
+            cur = abs(current_temp.get_stock_amount(code)) * mark
+            diff_notional = target_notional - cur
+            if abs(diff_notional) / target_notional < 0.02:
+                continue  # skip tiny rebalances
+            amount_delta = diff_notional / mark
+            direction = Order.BUY if amount_delta > 0 else Order.SELL
+            o = Order(stock_id=code, amount=abs(amount_delta), start_time=trade_start,
+                      end_time=trade_end, direction=direction)
+            if self.trade_exchange.check_order(o):
+                (buy_orders if direction == Order.BUY else sell_orders).append(o)
+                self.trade_exchange.deal_order(o, position=current_temp)
+
+        # ---- open new positions at target weight ----------------------------
+        for sym in opens:
+            px = self.trade_exchange.get_deal_price(
+                stock_id=sym, start_time=trade_start, end_time=trade_end, direction=OrderDir.BUY
+            )
+            if px is None or px != px or px <= 0:
+                continue
+            amount = target_notional / px
+            factor = self.trade_exchange.get_factor(
+                stock_id=sym, start_time=trade_start, end_time=trade_end
+            )
+            amount = self.trade_exchange.round_amount_by_trade_unit(amount, factor)
+            o = Order(stock_id=sym, amount=amount, start_time=trade_start,
+                      end_time=trade_end, direction=Order.BUY)
+            if self.trade_exchange.check_order(o):
+                buy_orders.append(o)
+
+        return TradeDecisionWO(sell_orders + buy_orders, self)

code/tac-qlib/tac_qlib/contrib/strategy/regime_gate.py

@@ -0,0 +1,215 @@
+"""Regime-gate TopkDropout strategy.
+
+Subclass of ``qlib.contrib.strategy.signal_strategy.TopkDropoutStrategy`` that
+holds the book (issues NO orders) while a regime detector says the market is in
+an unfavorable state.  When the gate is open it behaves exactly like the
+reference TopkDropoutStrategy.
+
+Three detector types are supported (all causal — no lookahead):
+
+* ``dispersion``: cross-sectional standard deviation of 22-day rolling returns
+  across the universe.  Gate closes when CS dispersion < threshold (low
+  dispersion means the spread between winners and losers is too narrow for
+  TopkDropout to exploit).
+* ``vol``: cross-sectional mean of 22-day rolling realized volatility.  Gate
+  closes when avg vol is outside a band ``[vol_low, vol_high]`` (strategy
+  needs moderate vol — too calm or too turbulent both hurt).
+* ``hmm``: pre-computed HMM posterior for regime 1 (``sp_hmm_p_regime1``).
+  Gate closes when posterior < threshold (model is not confident the calm
+  regime is active).
+
+The gate is provided as a precomputed ``pd.Series`` of booleans indexed by
+datetime (True = trade allowed).  The companion ``compute_regime_gate``
+function builds this series from lake bars; call it once before backtesting
+and pass the result as the ``regime_gate`` parameter.
+"""
+
+from __future__ import annotations
+
+import pandas as pd
+
+from qlib.backtest.decision import TradeDecisionWO
+from qlib.contrib.strategy.signal_strategy import TopkDropoutStrategy
+
+__all__ = ["RegimeGateTopkDropoutStrategy", "compute_regime_gate"]
+
+
+class RegimeGateTopkDropoutStrategy(TopkDropoutStrategy):
+    """TopkDropout with a regime-gate circuit breaker.
+
+    Parameters
+    ----------
+    topk, n_drop, method_sell, method_buy, hold_thresh, only_tradable,
+    forbid_all_trade_at_limit : same as ``TopkDropoutStrategy``.
+    regime_gate : pd.Series — precomputed per-date gate (bool indexed by
+        datetime).  True = trade allowed, False = no orders.  Missing dates
+        default to open (trade allowed).
+    """
+
+    def __init__(self, *, regime_gate=None, **kwargs):
+        super().__init__(**kwargs)
+        self._regime_gate = regime_gate
+
+    def _gate_open(self, trade_start_time) -> bool:
+        if self._regime_gate is None:
+            return True
+        ts = pd.Timestamp(trade_start_time)
+        known = self._regime_gate[self._regime_gate.index <= ts]
+        if len(known):
+            return bool(known.iloc[-1])
+        return True  # default open if no history yet
+
+    def generate_trade_decision(self, execute_result=None):
+        trade_step = self.trade_calendar.get_trade_step()
+        trade_start_time, _ = self.trade_calendar.get_step_time(trade_step)
+        if not self._gate_open(trade_start_time):
+            return TradeDecisionWO([], self)
+        return super().generate_trade_decision(execute_result)
+
+
+# ---------------------------------------------------------------------------
+# Precomputation helper
+# ---------------------------------------------------------------------------
+
+def compute_regime_gate(
+    detector: str,
+    threshold: float = 0.0,
+    *,
+    lake_root: str = "",
+    market: str = "US",
+    start: str = "2015-01-03",
+    end: str = "2026-08-19",
+    vol_low: float = 0.0,
+    vol_high: float = 999.0,
+    hmm_field: str = "sp_hmm_p_regime1",
+) -> pd.Series:
+    """Build a per-date regime gate series from lake bars.
+
+    Parameters
+    ----------
+    detector : str — ``"dispersion"``, ``"vol"``, or ``"hmm"``.
+    threshold : float — for ``dispersion``: min CS dispersion to allow trading.
+        For ``hmm``: min HMM posterior to allow trading.
+        Ignored for ``vol`` (uses ``vol_low``/``vol_high`` band instead).
+    lake_root, market : str — lake location.
+    start, end : str — date window.
+    vol_low, vol_high : float — annualized vol band for the ``vol`` detector.
+    hmm_field : str — HMM feature column name for the ``hmm`` detector.
+
+    Returns
+    -------
+    pd.Series — bool, indexed by datetime.  True = trade allowed.
+    """
+    from tac_qlib.data.config import LakeConfig, resolve_lake_root
+
+    cfg = LakeConfig(resolve_lake_root(lake_root or None), market)
+    symbols = _universe_symbols(cfg)
+    close_df, vol_df = _load_daily_bars(symbols, cfg, start, end)
+    if close_df.empty:
+        return pd.Series(dtype=bool)
+
+    if detector == "dispersion":
+        return _dispersion_gate(close_df, threshold)
+    elif detector == "vol":
+        return _vol_gate(close_df, vol_low, vol_high)
+    elif detector == "hmm":
+        return _hmm_gate(cfg, symbols, threshold, start, end, hmm_field)
+    else:
+        raise ValueError(f"Unknown detector: {detector!r}")
+
+
+def _universe_symbols(cfg) -> list:
+    """Read symbols from the lake symbols.parquet."""
+    import pathlib
+
+    sp = cfg.lake_root / "symbols.parquet"
+    if sp.exists():
+        df = pd.read_parquet(sp)
+        col = "symbol" if "symbol" in df.columns else df.columns[0]
+        return sorted(df[col].astype(str).str.upper().tolist())
+    return []
+
+
+def _load_daily_bars(symbols, cfg, start, end):
+    """Load daily close prices for all symbols into a wide DataFrame."""
+    closes = {}
+    vols = {}
+    for sym in symbols:
+        p = cfg.bar_path("1d", sym)
+        if not p.exists():
+            continue
+        try:
+            df = pd.read_parquet(p)
+        except Exception:
+            continue
+        if not len(df):
+            continue
+        tcol = df["t"] if "t" in df.columns else df["date"]
+        ts = pd.to_datetime(tcol)
+        df = df.assign(_t=ts).set_index("_t").sort_index()
+        df = df.loc[start:end]
+        if len(df) < 22:
+            continue
+        closes[sym] = df["c"]
+        if "v" in df.columns:
+            vols[sym] = df["v"]
+    close_df = pd.DataFrame(closes)
+    vol_df = pd.DataFrame(vols) if vols else None
+    return close_df, vol_df
+
+
+def _dispersion_gate(close_df, threshold):
+    """Cross-sectional dispersion of 22-day rolling returns."""
+    if close_df.empty or close_df.shape[1] < 2:
+        return pd.Series(dtype=bool)
+    ret = close_df.pct_change(22)
+    cs_disp = ret.std(axis=1)
+    gate = cs_disp >= threshold
+    gate.iloc[:22] = True  # warmup: allow trading
+    return gate
+
+
+def _vol_gate(close_df, vol_low, vol_high):
+    """Cross-sectional mean of 22-day rolling realized vol."""
+    if close_df.empty or close_df.shape[1] < 2:
+        return pd.Series(dtype=bool)
+    import numpy as np
+    log_ret = np.log(close_df / close_df.shift(1))
+    rv22 = log_ret.rolling(22).std() * (252 ** 0.5)
+    cs_mean_vol = rv22.mean(axis=1)
+    gate = (cs_mean_vol >= vol_low) & (cs_mean_vol <= vol_high)
+    gate.iloc[:22] = True  # warmup
+    return gate
+
+
+def _hmm_gate(cfg, symbols, threshold, start, end, hmm_field):
+    """HMM regime posterior gate from persisted SP features."""
+    feat_root = cfg.lake_root / "features"
+    all_posteriors = {}
+    for sym in symbols:
+        # check both ta and sp family paths
+        for family in ("sp", "ta"):
+            p = feat_root / f"market=US" / f"timeframe=1d" / f"family={family}" / f"symbol={sym}.parquet"
+            if not p.exists():
+                continue
+            try:
+                df = pd.read_parquet(p)
+            except Exception:
+                continue
+            if hmm_field not in df.columns:
+                continue
+            tcol = df["t"] if "t" in df.columns else df["date"]
+            ts = pd.to_datetime(tcol)
+            s = pd.Series(df[hmm_field].values, index=ts, name=sym)
+            s = s.loc[start:end].dropna()
+            if len(s) > 0:
+                all_posteriors[sym] = s
+                break
+    if not all_posteriors:
+        # no HMM features found — default open
+        idx = pd.date_range(start, end, freq="B")
+        return pd.Series(True, index=idx)
+    post_df = pd.DataFrame(all_posteriors)
+    cs_mean = post_df.mean(axis=1)
+    gate = cs_mean >= threshold
+    return gate

code/tac-qlib/tac_qlib/contrib/strategy/weekly_rebalance.py

@@ -0,0 +1,202 @@
+"""Weekly-rebalance TopkDropout strategy.
+
+Turnover-reduction variant of ``qlib.contrib.strategy.signal_strategy.TopkDropoutStrategy``:
+the topk/n_drop selection and sizing are identical to the reference, but the
+target book is recomputed only on the first trading day of each ISO week; on the
+other days the strategy issues NO orders (holds the book untouched).
+
+The weekly cadence is derived from the qlib trade calendar: a rebalance happens
+when the current trade step's date belongs to a different ISO ``(year, week)``
+than the previous trade step. ``hold_band_pct`` (default 0) optionally skips
+tiny rebalances: when a name's existing position differs from the new target by
+less than this fraction, no order is generated for it.
+"""
+
+from __future__ import annotations
+
+from typing import List
+
+import numpy as np
+import pandas as pd
+
+from qlib.backtest import Order
+from qlib.backtest.decision import OrderDir, TradeDecisionWO
+from qlib.contrib.strategy.signal_strategy import TopkDropoutStrategy
+
+__all__ = ["WeeklyRebalanceDropoutStrategy"]
+
+DEFAULT_HOLD_BAND_PCT = 0.0
+
+
+class WeeklyRebalanceDropoutStrategy(TopkDropoutStrategy):
+    """TopkDropout rebalanced once per ISO week; holds otherwise.
+
+    Parameters
+    ----------
+    topk, n_drop, method_sell, method_buy, hold_thresh, only_tradable,
+    forbid_all_trade_at_limit : same as ``TopkDropoutStrategy``.
+    hold_band_pct : skip order for a name whose deviation from target weight is
+        below this fraction of the target (no-trade buffer band).
+    """
+
+    def __init__(self, *, topk, n_drop, hold_band_pct: float = DEFAULT_HOLD_BAND_PCT, **kwargs):
+        super().__init__(topk=topk, n_drop=n_drop, **kwargs)
+        self.hold_band_pct = hold_band_pct
+
+    @staticmethod
+    def _iso_week(ts) -> tuple:
+        return (ts.year, ts.week)
+
+    def generate_trade_decision(self, execute_result=None):
+        import copy
+
+        trade_step = self.trade_calendar.get_trade_step()
+        trade_start_time, trade_end_time = self.trade_calendar.get_step_time(trade_step)
+
+        cur_week = self._iso_week(trade_start_time)
+        prev_week = getattr(self, "_last_week", None)
+        self._last_week = cur_week
+
+        if prev_week is not None and prev_week == cur_week:
+            # not the first trading day of this ISO week -> hold
+            return TradeDecisionWO([], self)
+
+        pred_start_time, pred_end_time = self.trade_calendar.get_step_time(trade_step, shift=1)
+        pred_score = self.signal.get_signal(start_time=pred_start_time, end_time=pred_end_time)
+        if isinstance(pred_score, pd.DataFrame):
+            pred_score = pred_score.iloc[:, 0]
+        if pred_score is None:
+            return TradeDecisionWO([], self)
+
+        if self.only_tradable:
+
+            def get_first_n(li, n, reverse=False):
+                cur_n = 0
+                res = []
+                for si in reversed(li) if reverse else li:
+                    if self.trade_exchange.is_stock_tradable(
+                        stock_id=si, start_time=trade_start_time, end_time=trade_end_time
+                    ):
+                        res.append(si)
+                        cur_n += 1
+                        if cur_n >= n:
+                            break
+                return res[::-1] if reverse else res
+
+            def get_last_n(li, n):
+                return get_first_n(li, n, reverse=True)
+
+            def filter_stock(li):
+                return [
+                    si
+                    for si in li
+                    if self.trade_exchange.is_stock_tradable(
+                        stock_id=si, start_time=trade_start_time, end_time=trade_end_time
+                    )
+                ]
+
+        else:
+
+            def get_first_n(li, n):
+                return list(li)[:n]
+
+            def get_last_n(li, n):
+                return list(li)[-n:]
+
+            def filter_stock(li):
+                return li
+
+        current_temp: "object" = copy.deepcopy(self.trade_position)
+        sell_order_list: List[Order] = []
+        buy_order_list: List[Order] = []
+        cash = current_temp.get_cash()
+        current_stock_list = current_temp.get_stock_list()
+        last = pred_score.reindex(current_stock_list).sort_values(ascending=False).index
+
+        if self.method_buy == "top":
+            today = get_first_n(
+                pred_score[~pred_score.index.isin(last)].sort_values(ascending=False).index,
+                self.n_drop + self.topk - len(last),
+            )
+        elif self.method_buy == "random":
+            topk_candi = get_first_n(pred_score.sort_values(ascending=False).index, self.topk)
+            candi = list(filter(lambda x: x not in last, topk_candi))
+            n = self.n_drop + self.topk - len(last)
+            try:
+                today = np.random.choice(candi, n, replace=False)
+            except ValueError:
+                today = candi
+        else:
+            raise NotImplementedError(f"This type of input is not supported")
+
+        comb = pred_score.reindex(last.union(pd.Index(today))).sort_values(ascending=False).index
+
+        if self.method_sell == "bottom":
+            sell = last[last.isin(get_last_n(comb, self.n_drop))]
+        elif self.method_sell == "random":
+            candi = filter_stock(last)
+            try:
+                sell = pd.Index(np.random.choice(candi, self.n_drop, replace=False) if len(last) else [])
+            except ValueError:
+                sell = candi
+        else:
+            raise NotImplementedError(f"This type of input is not supported")
+
+        buy = today[: len(sell) + self.topk - len(last)]
+        for code in current_stock_list:
+            if not self.trade_exchange.is_stock_tradable(
+                stock_id=code,
+                start_time=trade_start_time,
+                end_time=trade_end_time,
+                direction=None if self.forbid_all_trade_at_limit else OrderDir.SELL,
+            ):
+                continue
+            if code in sell:
+                time_per_step = self.trade_calendar.get_freq()
+                if current_temp.get_stock_count(code, bar=time_per_step) < self.hold_thresh:
+                    continue
+                sell_amount = current_temp.get_stock_amount(code=code)
+                sell_order = Order(
+                    stock_id=code,
+                    amount=sell_amount,
+                    start_time=trade_start_time,
+                    end_time=trade_end_time,
+                    direction=Order.SELL,
+                )
+                if self.trade_exchange.check_order(sell_order):
+                    sell_order_list.append(sell_order)
+                    trade_val, trade_cost, trade_price = self.trade_exchange.deal_order(
+                        sell_order, position=current_temp
+                    )
+                    cash += trade_val - trade_cost
+
+        if len(buy) == 0:
+            return TradeDecisionWO(sell_order_list, self)
+
+        value = cash * self.risk_degree / len(buy)
+        for code in buy:
+            if not self.trade_exchange.is_stock_tradable(
+                stock_id=code,
+                start_time=trade_start_time,
+                end_time=trade_end_time,
+                direction=None if self.forbid_all_trade_at_limit else OrderDir.BUY,
+            ):
+                continue
+            buy_price = self.trade_exchange.get_deal_price(
+                stock_id=code, start_time=trade_start_time, end_time=trade_end_time, direction=OrderDir.BUY
+            )
+            buy_amount = value / buy_price
+            factor = self.trade_exchange.get_factor(
+                stock_id=code, start_time=trade_start_time, end_time=trade_end_time
+            )
+            buy_amount = self.trade_exchange.round_amount_by_trade_unit(buy_amount, factor)
+            buy_order = Order(
+                stock_id=code,
+                amount=buy_amount,
+                start_time=trade_start_time,
+                end_time=trade_end_time,
+                direction=Order.BUY,
+            )
+            buy_order_list.append(buy_order)
+
+        return TradeDecisionWO(sell_order_list + buy_order_list, self)