请问一下，最后一步乘以系数是什么意思呢？

[chenjw505]

` sub['week3'] = y_pred * 1.6

sub['week1'] = sub['week3'].map(lambda x: (x / 1.6) * 1)

sub['week2'] = sub['week3'].map(lambda x: (x / 1.6) * 1.3)

sub['week3'] = sub['week3'].map(lambda x: (x / 1.6) * 1.7)

sub['week4'] = sub['week3'].map(lambda x: (x / 1.6) * 2.1)

sub['week5'] = sub['week3'].map(lambda x: (x / 1.6) * 0.7) `

请问一下，这个系数是怎么确定的？