Equation 1.3.3

Hi,

How do we arrive at equation 1.3.3 on page 27?
L(action|x) = Ey∼p(y|x)[loss(action,y)].
And how do we interpret this?

I understand the previous one (following), which says “Conditional Probablity” that y is equal to deathcap from images is 0.2…
P(y = deathcap|image) = 0.2

Could someone please help me.

Thanks!