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routing: don't compute prob for success amounts

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We skip the evaluation of probabilities when the amount is lower than
the last success amount, as the probability would be evaluated to 1 in
that case.
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bitromortac 2023-12-22 14:17:18 +01:00
parent 9087f4045b
commit 1878fa1351
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routing/probability_bimodal.go
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@ -525,6 +525,11 @@ func (p *BimodalEstimator) probabilityFormula(capacityMsat, successAmountMsat,
return 0.0, nil return 0.0, nil
} }
// We can send the amount if it is smaller than the success amount.
if amount <= successAmount {
return 1.0, nil
}
// The success probability for payment amount a is the integral over the // The success probability for payment amount a is the integral over the
// prior distribution P(x), the probability to find liquidity between // prior distribution P(x), the probability to find liquidity between
// the amount a and channel capacity c (or failAmount a_f): // the amount a and channel capacity c (or failAmount a_f):