Throughout the preceding sections, the uncertainties in the supplied target values f_i
σ_i
f_i
σ_data
σ_i = σ_data ∀ i
σ_data
σ_data
σ_data
P σ_data | x_i, f_i
P σ_data | x_i
P f_i | σ_data, x_i
u
u
P f_i | σ_data, x_i , u_i
n_u
L_2
u^0
σ_data