Imagine the cardpool of a ptw game looks like: One can flip a card. there is a probability (here say 0.02) to have a prize at the beginning. If one does not have the prize for 50 attempts in a row, ...

This is a fast negative-binomial distribution for Python and C++, optimised for small repeated integer counts such as those seen in single-cell RNA sequencing data, and including zero inflation.

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