The chi-square Csiszar-function in log-space

A Csiszar-function is a member of F = { f:R_+ to R : f convex }.

vi_chi_square(logu, name = NULL)

Arguments

logu	float-like Tensor representing log(u) from above.
name	name prefixed to Ops created by this function.

Value

chi_square_of_u: float-like Tensor of the Csiszar-function evaluated at u = exp(logu).

Details

The Chi-square Csiszar-function is:

f(u) = u**2 - 1

Warning: this function makes non-log-space calculations and may therefore be numerically unstable for |logu| >> 0.

See also

Other vi-functions: vi_amari_alpha(), vi_arithmetic_geometric(), vi_csiszar_vimco(), vi_dual_csiszar_function(), vi_fit_surrogate_posterior(), vi_jeffreys(), vi_jensen_shannon(), vi_kl_forward(), vi_kl_reverse(), vi_log1p_abs(), vi_modified_gan(), vi_monte_carlo_variational_loss(), vi_pearson(), vi_squared_hellinger(), vi_symmetrized_csiszar_function()