feat(strategies): 实现定制组件（因子、信号生成器、风控）
- strategies/shared/factors/momentum.py: MomentumFactor/TrendFactor/ReversalFactor/VolatilityFactor - strategies/shared/signals/selectors.py: TopNSelector/TrendFollower/ReversalTrader - strategies/shared/risk/controls.py: StopLossControl/PositionLimitControl/PremiumControl - strategies/shared/__init__.py: 统一入口导出所有定制组件
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strategies/shared/factors/momentum.py
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243
strategies/shared/factors/momentum.py
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"""
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定制因子实现
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这些因子继承framework.core.factors.FactorBase
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"""
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from framework.factors import FactorBase, FactorRegistry
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import pandas as pd
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import numpy as np
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import math
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class MomentumFactor(FactorBase):
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"""
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动量因子（定制实现）
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计算加权线性回归动量得分：
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得分 = 年化收益率 × R²
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参数：
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- n_days: 动量窗口（默认25）
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- weighted: 是否加权（默认True）
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- crash_filter: 是否启用崩盘过滤（默认True）
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"""
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name = "momentum"
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category = "momentum"
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def __init__(
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self,
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n_days: int = 25,
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weighted: bool = True,
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crash_filter: bool = True
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):
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super().__init__(n_days=n_days, weighted=weighted, crash_filter=crash_filter)
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self.n_days = n_days
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self.weighted = weighted
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self.crash_filter = crash_filter
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def compute(self, data: pd.DataFrame) -> pd.Series:
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"""计算动量因子值"""
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if 'close' not in data.columns:
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raise ValueError("data must contain 'close' column")
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prices = data['close']
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if self.weighted:
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factor_values = prices.rolling(self.n_days).apply(
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lambda x: self._weighted_momentum_score(x.values),
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raw=False
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)
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else:
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factor_values = prices.pct_change(self.n_days)
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if self.crash_filter:
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factor_values = self._apply_crash_filter(prices, factor_values)
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return factor_values
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def _weighted_momentum_score(self, prices: np.ndarray) -> float:
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"""计算加权动量得分"""
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if len(prices) < 5:
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return 0.0
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y = np.log(prices)
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x = np.arange(len(y))
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weights = np.linspace(1, 2, len(y))
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slope, intercept = np.polyfit(x, y, 1, w=weights)
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annualized_returns = math.exp(slope * 250) - 1
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y_pred = slope * x + intercept
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ss_res = np.sum(weights * (y - y_pred) ** 2)
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ss_tot = np.sum(weights * (y - np.average(y, weights=weights)) ** 2)
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r2 = 1 - ss_res / ss_tot if ss_tot > 0 else 0
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return annualized_returns * r2
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def _apply_crash_filter(self, prices: pd.Series, factor_values: pd.Series) -> pd.Series:
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"""崩盘过滤：连续3天跌>5%清零"""
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result = factor_values.copy()
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for i in range(3, len(prices)):
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r1 = prices.iloc[i] / prices.iloc[i-1]
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r2 = prices.iloc[i-1] / prices.iloc[i-2]
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r3 = prices.iloc[i-2] / prices.iloc[i-3]
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con1 = min(r1, r2, r3) < 0.95
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con2 = (r1 < 1) and (r2 < 1) and (r3 < 1) and (prices.iloc[i] / prices.iloc[i-3] < 0.95)
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if con1 or con2:
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result.iloc[i] = 0.0
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return result
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class TrendFactor(FactorBase):
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"""趋势因子（定制实现）"""
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name = "trend"
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category = "trend"
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def __init__(self, method: str = 'ma_cross', fast: int = 5, slow: int = 20):
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super().__init__(method=method, fast=fast, slow=slow)
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self.method = method
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self.fast = fast
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self.slow = slow
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def compute(self, data: pd.DataFrame) -> pd.Series:
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"""计算趋势因子值"""
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if 'close' not in data.columns:
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raise ValueError("data must contain 'close' column")
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prices = data['close']
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if self.method == 'ma_cross':
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fast_ma = prices.rolling(self.fast).mean()
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slow_ma = prices.rolling(self.slow).mean()
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return (fast_ma - slow_ma) / slow_ma
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elif self.method == 'macd':
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ema12 = prices.ewm(span=12).mean()
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ema26 = prices.ewm(span=26).mean()
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macd = ema12 - ema26
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signal = macd.ewm(span=9).mean()
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return macd - signal
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else:
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raise ValueError(f"Unknown method: {self.method}")
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class ReversalFactor(FactorBase):
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"""反转因子（定制实现）"""
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name = "reversal"
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category = "reversal"
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def __init__(self, method: str = 'rsi', period: int = 14, overbought: float = 70, oversold: float = 30):
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super().__init__(method=method, period=period, overbought=overbought, oversold=oversold)
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self.method = method
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self.period = period
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self.overbought = overbought
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self.oversold = oversold
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def compute(self, data: pd.DataFrame) -> pd.Series:
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"""计算反转因子值"""
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if 'close' not in data.columns:
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raise ValueError("data must contain 'close' column")
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prices = data['close']
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if self.method == 'rsi':
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rsi = self._compute_rsi(prices, self.period)
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reversal_signal = np.where(
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rsi > self.overbought,
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-(rsi - self.overbought) / (100 - self.overbought),
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np.where(
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rsi < self.oversold,
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(self.oversold - rsi) / self.oversold,
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0
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)
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)
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return pd.Series(reversal_signal, index=prices.index)
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elif self.method == 'kdj':
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return self._compute_kdj(data)
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else:
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raise ValueError(f"Unknown method: {self.method}")
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def _compute_rsi(self, prices: pd.Series, period: int) -> pd.Series:
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"""计算RSI"""
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delta = prices.diff()
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gain = delta.where(delta > 0, 0)
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loss = (-delta).where(delta < 0, 0)
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avg_gain = gain.rolling(period).mean()
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avg_loss = loss.rolling(period).mean()
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rs = avg_gain / avg_loss
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return 100 - (100 / (1 + rs))
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def _compute_kdj(self, data: pd.DataFrame) -> pd.Series:
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"""计算KDJ反转信号"""
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low = data['low']
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high = data['high']
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close = data['close']
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low_min = low.rolling(self.period).min()
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high_max = high.rolling(self.period).max()
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rsv = (close - low_min) / (high_max - low_min) * 100
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k = rsv.ewm(alpha=1/3).mean()
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d = k.ewm(alpha=1/3).mean()
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j = 3 * k - 2 * d
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return j
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class VolatilityFactor(FactorBase):
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"""波动率因子（定制实现）"""
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name = "volatility"
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category = "volatility"
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def __init__(self, method: str = 'std', period: int = 20):
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super().__init__(method=method, period=period)
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self.method = method
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self.period = period
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def compute(self, data: pd.DataFrame) -> pd.Series:
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"""计算波动率因子值"""
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if self.method == 'std':
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return data['close'].rolling(self.period).std()
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elif self.method == 'atr':
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return self._compute_atr(data)
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else:
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raise ValueError(f"Unknown method: {self.method}")
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def _compute_atr(self, data: pd.DataFrame) -> pd.Series:
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"""计算ATR"""
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high = data['high']
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low = data['low']
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close = data['close']
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prev_close = close.shift(1)
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tr = pd.concat([
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high - low,
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(high - prev_close).abs(),
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(low - prev_close).abs()
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], axis=1).max(axis=1)
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return tr.rolling(self.period).mean()
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# 注册因子
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FactorRegistry.register(MomentumFactor)
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FactorRegistry.register(TrendFactor)
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FactorRegistry.register(ReversalFactor)
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FactorRegistry.register(VolatilityFactor)
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