trigamma problem

It seems to work ok if I have a zero prior, so the problem with trigamma.m comes from introducing the non-zero prior. I have no idea how to fix this, so any help you can give would be much appreciated.

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I recalled I also had such problem for some seeds.

Instead of training model with seeds= (1, 10), I trained models with seeds = (1,30) and then collected 10 successful ones.