> regularization term on weights. L1 正则化项的权重系数,越大模型越保守。防止过拟合,提高泛化能力 > > reg_lambda(= lambda_l2) (float__, optional (default=0.)) – L2 > regularization term on weights. L2 正则化项的权重系数,越大模型越保守。防止过