tf.contrib.distributions.Binomial.log_prob(value, name='log_prob')
Log probability density/mass function (depending on is_continuous).
Additional documentation from Binomial:
For each batch member of counts value, P[counts] is the probability that after sampling n draws from this Binomial distribution, the number of successes is k. Note that different sequences of draws can result in the same counts, thus the probability includes a combinatorial coefficient.
value must be a non-negative tensor