bvandeusenandClaude Opus 5.5
d191a28217
Comment blocks in cmd/minstrel and 30 smaller internal packages, rewritten
to rule 32's standard with each citation read in context: task, milestone
and rule ids go, and so do the stories they were attached to ("used to",
"Before #N", measurements from one install, quotes, pointers to Fabled
Librarian's records and to docs/superpowers files that are not in the
repo). Where a story wrapped a real constraint, the constraint stays as a
present-tense fact.
Comments that had gone stale are corrected:
- taste.Config: the tuned values are overlaid by internal/recsettings;
it is no longer "a later follow-up".
- StorageConfig: the data dir holds art, caches and the stream secret,
not only playlist covers.
- the Subsonic album list and getUser comments describe what they do
today rather than a milestone that would change it.
Checked: the non-comment token stream of every changed file matches
HEAD, and gofmt -l is empty.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
82 lines
2.4 KiB
Go
82 lines
2.4 KiB
Go
// Package taste builds a persistent, decaying per-user taste profile.
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// engagement.go is the pure core: it turns a single play's completion ratio
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// into a graded taste signal in [-1, +1], replacing the binary was_skipped
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// for learning purposes (was_skipped stays as-is for History display).
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package taste
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import "math"
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// EngagementParams tune the completion→engagement curve. All in [0,1] and
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// ordered HardSkip < NeutralCompletion < FullCompletion.
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type EngagementParams struct {
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// HardSkip: completion at/below which a play is a strong reject (-1).
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HardSkip float64
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// NeutralCompletion: completion at which a play is neutral (0). Set low
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// (~0.30) because people enjoy plenty of tracks they don't finish; only
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// genuinely-early abandons read as negative.
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NeutralCompletion float64
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// FullCompletion: completion at/above which a play is a full positive
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// (+1).
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FullCompletion float64
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}
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// DefaultEngagementParams returns the tuned starting curve.
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func DefaultEngagementParams() EngagementParams {
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return EngagementParams{HardSkip: 0.05, NeutralCompletion: 0.30, FullCompletion: 0.90}
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}
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// Engagement maps a play's completion ratio to a taste signal in [-1, +1]
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// via two linear ramps meeting at the neutral point:
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//
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// completion <= HardSkip → -1
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// HardSkip < c < Neutral → ramp -1 → 0
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// Neutral <= c < Full → ramp 0 → +1
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// completion >= Full → +1
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//
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// Completion is clamped to [0,1]. Degenerate params (non-increasing
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// thresholds) collapse the affected ramp to its endpoint rather than
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// dividing by zero.
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func Engagement(completion float64, p EngagementParams) float64 {
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c := clamp01(completion)
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if c <= p.HardSkip {
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return -1
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}
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if c < p.NeutralCompletion {
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span := p.NeutralCompletion - p.HardSkip
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if span <= 0 {
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return 0
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}
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return -1 + (c-p.HardSkip)/span
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}
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if c < p.FullCompletion {
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span := p.FullCompletion - p.NeutralCompletion
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if span <= 0 {
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return 1
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}
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return (c - p.NeutralCompletion) / span
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}
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return 1
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}
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// decay is the exponential time-decay applied to a play's engagement:
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// 1.0 at age 0, 0.5 at age == halfLifeDays. Negative ages clamp to 0.
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func decay(ageDays, halfLifeDays float64) float64 {
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if ageDays < 0 {
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ageDays = 0
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}
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if halfLifeDays <= 0 {
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return 1
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}
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return math.Exp(-math.Ln2 * ageDays / halfLifeDays)
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}
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func clamp01(x float64) float64 {
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if x < 0 {
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return 0
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}
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if x > 1 {
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return 1
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}
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return x
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}
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