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Approximates upper tail quantile for range coding.
tfc.distributions.upper_tail( distribution, tail_mass )
For range coding of random variables, the distribution tails need special
handling, because range coding can only handle alphabets with a finite
number of symbols. This method returns a cut-off location for the upper
tail, such that approximately
tail_mass probability mass is contained in
the tails (together). The tails are then handled by using the 'overflow'
functionality of the range coder implementation (using an Elias gamma code).
||Float between 0 and 1. Desired probability mass for the tails.|