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The Jeffreys Csiszar-function in log-space.

A Csiszar-function is a member of,

F = { f:R_+ to R : f convex }.

The Jeffreys Csiszar-function is:

f(u) = 0.5 ( u log(u) - log(u) )
     = 0.5 kl_forward + 0.5 kl_reverse
     = symmetrized_csiszar_function(kl_reverse)
     = symmetrized_csiszar_function(kl_forward)

This Csiszar-function induces a symmetric f-Divergence, i.e., D_f[p, q] = D_f[q, p].

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

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