Here I define a helper function that calculates $R^2$ score, It is defined as $$ R^2 = 1 \frac{SS_{res}}{SS_{tot}} = 1 \frac{\sum (y_i \hat{y}_i)^2}{\sum (y_i \bar{y})^2} $$ Where: $SS_{res}$ (Sum of Squared Residuals) represents the error variance o     Here I define a helper function that calculates $R^2$ score, It is defined as $$ R^2 = 1-\frac{SS_{res}}{SS_{tot}} = 1-\frac{\sum (y_i-\hat{y}_i)^2}{\sum (y_i-\bar{y})^2} $$ Where:-$SS_{res}$ (Sum of Squared Residuals) represents the error variance o     Hạt xanh xuống biển~Cô gái ngây thơ và xinh đẹp [04 đứa trẻ]Cô gái hoàn hảo nhà bên xuống biển~Tắm khỏa thân~Cám dỗ nhảy sexy (4)     177cm tall, long-legged, contrasting female dog [svj798ds] White hat, tight-fitting clothes, open-crotch yoga pants, intense pounding, and from then on, I fell in love with yoga pants (1)     [Hạt tiêu] mới nhất tháng 9 tùy chỉnh, nhiều điệu nhảy khỏa thân COS, đạo cụ phun hoa tử vi, quan hệ tình dục với nhà tài trợ (5)     Green seed goes to the sea with good looks and big breasts @米米 Pig Standard Welfare Show     Die Jüngste dieses Jahr! Das kleine Mädchen wurde zu Tode gefickt~ [Chengcheng] hat sie abwechselnd wild gefickt~ sie schrie vor Schmerzen     Dừa hàt dẻ     Green seed goes to the sea with good looks and big breasts     a Cat Cat Hat     Hot Slutty Teen Riley Jean Cheats On Her BF With Peter Green For Cash     Hot--Slutty Teen Riley Jean Cheats On Her BF With Peter Green For Cash     Hot-Slutty Teen Riley Jean Cheats On Her BF With Peter Green For Cash     Candid Boutique] Der Meister hat sich in die Schulbekleidung der Schule geschlichen, um heimlich Fotos von den kleinen zärtlichen Fotzen von schönen Schulmädchen zu machen     Aricia strip.hat     Eva Green     green dog