Linear log-odds score before logistic conversion

gh-eq-319054d06afff045source-continuation-equation

fixed champion, a fixed feature vector, and no DB. It computes log odds = intercept + SUM(coefficient_j * value_j) in shopspring/decimal, applies the logistic (a single isolated float conversion, re quantized to

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The model adds an intercept to the sum of each coefficient times its corresponding feature. Applying a logistic transform converts that log-odds score into a value between zero and one. The source uses decimal arithmetic for the linear combination and an isolated floating-point conversion for the nonlinear transform; actual predictive calibration depends on training and evaluation, not only this formula.

Terms & definitions

Term	Meaning in this source
intercept	Constant model offset
coefficient_j	Weight of feature j
value_j	Feature value
log_odds	Linear model output

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Original context

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// ExecuteIntent path) and extracts the declared scalar feature from its result. The extractor closes over the
// bound args (the segment keys). It is the FIXED, reviewed set of features a MAG intent may read; a feature
// intent with no extractor is refused, so a model can never read a feature the platform did not author an
// extractor for.
type featureExtractor func(ctx context.Context, db *tenant.DB, args []any) (decimal.Decimal, string, error)

// scoreModelIntent is the pure serving math, separated from the database read so it is unit testable with a
// fixed champion, a fixed feature vector, and no DB. It computes log odds = intercept + SUM(coefficient_j *
// value_j) in shopspring/decimal, applies the logistic (a single isolated float conversion, re quantized to
// decimal immediately), applies the calibration map, and returns the calibrated probability plus the ordered
// contribution trace. Every SURFACED number (the value, the coefficient, the contribution, the probability) is
// decimal; the only float is the transient sigmoid argument, which never surfaces.
func scoreModelIntent(model championModel, feats []Contribution) (decimal.Decimal, []Contribution) {
	// The additive log odds in decimal: the intercept plus every feature's coefficient times value. Each
	// feature carries its own contribution (coefficient times value) as the citation.
	logOdds := model.Intercept
	trace := make([]Contribution, 0, len(feats)+1)
	trace = append(trace, Contribution{

Exact original notation

fixed champion, a fixed feature vector, and no DB. It computes log odds = intercept + SUM(coefficient_j *
value_j) in shopspring/decimal, applies the logistic (a single isolated float conversion, re quantized to