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jitter init should not give up if first try is nan #4107

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@twiecki

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@twiecki

Our default init is quite brittle when it comes to models that easily have nans or -infs for certain parts of the parameter space. STAN retries multiple times if the current value is no good and I think we should too. We could output to the user how many times we had to try and if it's high enough maybe tell them to try and make the model more robust.

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