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If learning rates or starting states are not set properly, you may often see the warning “Illegal value sampled this iteration.” This happens when an illegal configuration is sampled during BBVI gradient estimation (For example, child node has a higher node height than the parent node). If you see this message a lot, please change starting states and learning rates so that the variational posterior of node heights do not overlap and variational posterior of population sizes do not cover negative values.
Command References
- Xinhao Liu, Huw A. Ogilvie, and Luay Nakhleh. Variational Inference Using Approximate Likelihood Under the Coalescent With Recombination.