高频选股因子周报（20260202-20260206）：高频因子分化，大单因子表现较好，多粒度因子继续稳定表现。AI 增强组合继续强势表现。

Investment Rating - The report indicates a positive performance of large order factors and stable performance of multi-granularity factors, with AI-enhanced portfolios showing strong results [2][3]. Core Insights - The report highlights the differentiation in high-frequency factors, with large order factors performing well. The AI-enhanced portfolio continues to show strong performance [2][3]. - The multi-granularity factors have maintained stable performance, with significant returns reported for both 5-day and 10-day label models [6][9]. - The AI-enhanced portfolios have demonstrated substantial excess and absolute returns across various combinations, indicating effective investment strategies [14][73]. Summary by Sections High-Frequency Factors and Deep Learning Factors - High-frequency skewness factor reported a multi-directional return of -1.11% for the last week and 2.89% for February 2026 [6][10]. - The downward volatility proportion factor showed a return of -0.61% for the last week and 4.14% for February 2026 [6][10]. - The opening buy intention proportion factor had a return of -0.04% for the last week and 3.82% for February 2026 [6][10]. - The opening large order net buy proportion factor reported a return of 0.34% for the last week and 2.89% for February 2026 [6][10]. - The AI-enhanced portfolios, including the weekly rebalancing AI air value increase portfolio, reported excess returns of 3.63% and absolute returns of 3.29% for the last week [14][73]. Multi-Granularity Factors - The multi-granularity model (5-day label) reported a multi-directional return of 0.65% for the last week and 6.15% for February 2026 [6][10]. - The multi-granularity model (10-day label) reported a multi-directional return of 0.53% for the last week and 4.60% for February 2026 [6][10]. AI Enhanced Portfolios - The weekly rebalancing of the CSI 500 AI enhanced wide constraint portfolio reported an excess return of 2.25% and an absolute return of -0.42% for the last week [14][73]. - The daily rebalancing of the CSI 1000 AI enhanced strict constraint portfolio reported an excess return of 1.65% and an absolute return of -0.82% for the last week [14][73].