def compute_phi_from_parents(self, u_lambda, mask=True):
        l = u_lambda[0]
        logl = u_lambda[1]
        phi0 = logl
        return [phi0]
Compute the natural parameter vector given parent moments.
dataset/ETHPy150Open bayespy/bayespy/bayespy/inference/vmp/nodes/poisson.py/PoissonDistribution.compute_phi_from_parents