libddogleg-java 0.22+ds-1 (amd64 binary) in ubuntu lunar

 DDogleg Numerics is a high performance Java library for non-linear
 optimization, clustering, robust model fitting, polynomial root finding,
 sorting, and more. The API is designed to be user to use, without excessive
 abstraction often found in other libraries. The user is provided with the
 capability to have tight control over memory and CPU usage.