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72b6136761
docs: C机器学习探索——时序外验证(§20)
纯Python逻辑回归(无sklearn), 前70%训练后30%测试防过拟合
结果: 止盈精确率34%→51%(+17pp) 时序外有效
但不优于缩量+收阳硬规则(wr61.8%), v_weak保持硬规则
新因子发现: mkt_adx接近上沿(+0.695)/r10f深跌(-0.278)/rsi_delta负(-0.150)
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