Perform Saul-Jordan update of variational parameters
Arguments
- X
The design matrix
- y
The response vector
- eta1
The current value of 1st natural parameter
- eta2
The current value of the 2nd natural parameter
- eta1_p
The prior value of the 1st natural parameter
- eta2_p
The prior value of the 2nd natural parameter
- omega1
The current value of the Omega1 variational parameter