Fractional total_count in Negative Binomial

9 views
Skip to first unread message

Krzysztof Rusek

unread,
Dec 10, 2021, 5:42:42 AM12/10/21
to TensorFlow Probability
Hello,

In the documentation of the total_count parameter of the tdf.NegativeBinomial we can read:
"Its components should be equal to integer values."
However, the distribution works fine with fractional values e.g the log_prob is differentiable wrt total_count.

Is there a particular reason for such a constrain since, mathematically, the fractional value is perfectly valid when NegativeBinomial is interpreted as GammaPoisson distribution.
In fact, the sampling method is based on this interpretation.

Regards
Krzysztof Rusek
Reply all
Reply to author
Forward
0 new messages