Write a function logₚrior that takes a numpy array trainₗabels as input, and outputs the following vector as a column numpy array (i.e., with shape $(2,1)$).
a) $[log(P(y=0)), log(P(y=1))]T$
b) $[log(P(y=1)), log(P(y=0))]T$
c) $[log(P(y=1|trainₗabels)), log(P(y=0|trainₗabels))]T$
d) $[log(P(y=0|trainₗabels)), log(P(y=1|trainₗabels))]T$
