Math for Deep Learning: arg min

arg min f(x) = the value x with the minimum value of f(x)

這個arg min f(x)的意思是，當f(x)是最小值的時候，x的數值

e.g. 以下的例子

f(0) = 3

f(0.9) = 2.1

f(1) = 2

f(1.1) = 2.5

f(2) = 5

f(3) = 46

因為最小的f(x) ＝ 2
則arg min f(x) = 1

Reference:

Explanation on arg min