#Bias

ORA-08322: scnmin: open/convert of bias lock failed

文档解释ORA-08322:scnmin:open/convertofbiaslockfailedCause:AcalltothelkmgrfailedtoopenandconvertthebiaslockAction:Checktomakesurethelkmgrisup.ORA-08322错误是一种Oracle数据...

ORA-08323: scnmin: close of bias lock failed

文档解释ORA-08323:scnmin:closeofbiaslockfailedCause:AcalltothelkmgrfailedtoclosethebiaslockAction:Checktomakesurethelkmgrisup.ORA-08323错误消息表明,在尝试关闭偏见锁时发生故障,此错误通常由下列...

Bias(偏差),Error(误差),和Variance(方差)的区别和联系

准:bias描述的是根据样本拟合出的模型的输出预测结果的期望与样本真实结果的差距,简单讲,就是在样本上拟合的好不好。要想在bias上表现好,lowbias,就得复杂化模型,增加模型的参数,但这样容易过拟合(overfitting),过拟合对应上图是highvariance,点很分散。lowbias对应就是点都打在靶心附...