80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
package memory
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import (
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"context"
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"math"
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"testing"
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"time"
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)
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func TestRetriever_DecayFactor_久未使用降权(t *testing.T) {
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t.Parallel()
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r := NewRetriever(newTestStore(t))
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now := time.Now().UTC()
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tests := []struct {
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name string
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updatedAt time.Time
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decayWeight float64
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want float64
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}{
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{name: "fresh keeps full weight", updatedAt: now, decayWeight: 1.0, want: 1.0},
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// Default half-life is 30 days: 60 days ago = 2 half-lives = 2^-2.
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{name: "two half-lives halves twice", updatedAt: now.Add(-60 * 24 * time.Hour), decayWeight: 1.0, want: 0.25},
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// Lower base decay_weight scales the whole curve down.
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{name: "low decay_weight scales down", updatedAt: now, decayWeight: 0.5, want: 0.5},
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{name: "low weight plus age compounds", updatedAt: now.Add(-60 * 24 * time.Hour), decayWeight: 0.5, want: 0.125},
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// A future timestamp must not boost above the base weight.
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{name: "future timestamp clamps to zero", updatedAt: now.Add(time.Hour), decayWeight: 1.0, want: 1.0},
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}
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for _, tt := range tests {
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tt := tt
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t.Run(tt.name, func(t *testing.T) {
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t.Parallel()
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got := r.decayFactor(MemoryItem{
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DecayWeight: tt.decayWeight,
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UpdatedAt: tt.updatedAt,
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}, now)
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if math.Abs(got-tt.want) > 1e-9 {
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t.Fatalf("decayFactor = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestRetriever_Retrieve_DecayWeight_降权(t *testing.T) {
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t.Parallel()
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ctx := context.Background()
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s := newTestStore(t)
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now := time.Now().UTC()
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// A fresh item but with a near-zero decay_weight (design: 用户可削弱某记忆).
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addItem(t, s, MemoryItem{
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PersonaID: "persona.a", Content: "低权重但新鲜", UpdatedAt: now,
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DecayWeight: 0.1, Scope: ScopePersona, Kind: KindWorldEvent,
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})
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// A slightly older item with a full decay_weight.
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addItem(t, s, MemoryItem{
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PersonaID: "persona.a", Content: "权重高稍旧", UpdatedAt: now.Add(-time.Hour),
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DecayWeight: 1.0, Scope: ScopePersona, Kind: KindWorldEvent,
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})
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r := NewRetriever(s)
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// A blank query matches nothing, so ordering is driven by the decay factor
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// (decay_weight × time decay) alone: the low-weight fresh item must fall
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// below the full-weight slightly-older item.
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results, err := r.Retrieve(ctx, "persona.a", "", 10)
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if err != nil {
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t.Fatalf("Retrieve: %v", err)
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}
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if len(results) != 2 {
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t.Fatalf("got %d results, want 2", len(results))
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}
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if got := results[0].Item.Content; got != "权重高稍旧" {
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t.Fatalf("top result = %q, want the full-decay-weight item", got)
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}
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if got := results[1].Item.Content; got != "低权重但新鲜" {
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t.Fatalf("second result = %q, want the low-decay-weight item", got)
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}
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}
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