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追「实例看起来没更新」时发现知识库检索本身也不可信,先把病因查清再动手: - **两段式召回不是瓶颈**:Store 的结果与全量暴力 cosine 完全一致; - **真因是向量没有区分度**:词向量取平均后各向异性明显,真实 KB(33 条)上自检索 top-1 只有 15%、前两名平均只差 0.013,排序基本是噪声; - 且全为停用词的查询会得到**空向量**("最近更新"),直接搜不出任何东西。 先在真实数据上把候选方案量了一遍(用自检索 top-1 / MRR)再动手:IDF 维度加权零收益、 去均值反而更差,**都不做**;唯一有收益的是与词法路(TF-IDF)融合。 改动: - `Store` 增设词法路索引,`Search` 融合两路:各自按**查询内最大值**归一化后加权。 权重 0.5 由权重扫描定:1.0(旧行为)MRR 0.271 / 0.8→0.354 / 0.7→0.358 / **0.5→0.376** / 0.3→0.336 / 0.0→0.307;语义查询也从"全是 openharmony 噪声"变成命中正确条目 (「首启人格门禁」→changelog_v1.2.1、「插件怎么开发和部署」→plugin_dev_build); - `vector.Store` 的候选中选阈值改为**可设**(默认 0.05 保持既有行为):TF-IDF 余弦量级 只有 0.0~0.2,沿用 0.05 会把词法路有效候选**静默砍掉**——这一条正是 0.376→0.197 的 差距来源,且当时没有任何报错; - Add/Remove/scanAll/ReindexWithVectorizer 同步维护两路;分数相同时按名字定序(结果可重复)。 **顺带修一个真实毛病**:Add/Remove 原先用**无追踪的 goroutine** 写索引(因为 writeIndex→BuildTree 会 RLock,而调用方持写锁,同步调用会死锁)→ 失败只打日志, 且与调用方竞态(测试的临时目录清理就撞上了)。改为持锁就地 flush (buildTreeLocked / writeIndexLocked)。 判据(不依赖人工标注问答对):新增 `internal/knowledge/rankdiag_test.go`,用**自检索 top-1 / MRR** 量区分度,`KB_DIAG=1` 跑、`KB_DIAG_ASSERT=1` 断言(MRR ≥ 0.34)。 另有不依赖真实数据的单测 6 条(空稠密向量靠词法路救回、稠密并列时词法路定序、 词法路阈值接线、Add/Remove 双路一致、并列时确定性、空库不 panic)。 **反向验证**(证明判据真能发现缺陷):权重退回 1.0、词法路阈值改回 0.05、 把阈值写死回 0.05 —— 对应测试逐条变红。另:我第一版夹具余弦 0.365/0.273 远高于阈值, 注入缺陷也不报错(等于没验),故加了「夹具前提」断言并改成两层判据 (语义层由 vector 包测试证明、接线层由知识库测试钉住)。 顺带纳入上一轮漏提交的 `TestAddOverwriteReplacesVector`(同名覆盖必须摘掉旧向量, 生产改动当时已提交,测试一直未入库)。
551 lines
15 KiB
Go
551 lines
15 KiB
Go
package knowledge
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import (
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"encoding/json"
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"fmt"
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"log"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"sync"
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"time"
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"gitcode.com/JianFeeeee/HomeAgent/internal/memory"
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"gitcode.com/JianFeeeee/HomeAgent/internal/memory/vector"
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)
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type Knowledge struct {
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Name string `json:"name"`
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Content string `json:"content"`
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Path string `json:"path"`
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Category string `json:"category,omitempty"` // 父路径,如 "tech/go"
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Tags []string `json:"tags"`
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UpdatedAt time.Time `json:"updated_at"`
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Meta map[string]string `json:"meta,omitempty"`
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}
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// IndexItem — 索引条目,包含向量特征和内容摘要
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type IndexItem struct {
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Name string `json:"name"`
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Preview string `json:"preview"` // 前 200 字摘要
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Tags []string `json:"tags"`
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Vector map[string]float64 `json:"vector"` // TF-IDF 特征向量(top-N 特征)
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Size int `json:"size"` // 内容总字节数
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}
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// TreeIndex — 树状索引节点
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type TreeIndex struct {
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Name string `json:"name"`
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Children map[string]*TreeIndex `json:"children,omitempty"`
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Items []IndexItem `json:"items,omitempty"` // 此节点下的知识条目(含向量)
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}
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func newTreeIndex(name string) *TreeIndex {
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return &TreeIndex{Name: name, Children: make(map[string]*TreeIndex)}
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}
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// compressVector 压缩向量:保留 topN 个权重最高的特征
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func compressVector(v vector.Vector, topN int) map[string]float64 {
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if len(v) <= topN {
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out := make(map[string]float64, len(v))
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for k, w := range v {
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out[k] = w
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}
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return out
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}
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type kv struct {
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k string
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v float64
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}
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sorted := make([]kv, 0, len(v))
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for k, w := range v {
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sorted = append(sorted, kv{k, w})
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}
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sort.Slice(sorted, func(i, j int) bool {
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return sorted[i].v > sorted[j].v
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})
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if topN > len(sorted) {
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topN = len(sorted)
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}
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sorted = sorted[:topN]
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out := make(map[string]float64, topN)
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for _, kv := range sorted {
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out[kv.k] = kv.v
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}
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return out
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}
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type Store struct {
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root string
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vec *vector.Store
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veczer *vector.TFIDFVectorizer
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// lex 是**词法路**索引(TF-IDF),与 vec(稠密路:词向量/多模态空间)相互独立。
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//
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// 为何要两路:词向量取平均后各向异性明显——所有文档都挤在语料均值方向附近,
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// 真实 KB(33 条)上自检索 top-1 只有 15%、前两名平均只差 0.013,排序基本是噪声。
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// 融合后 MRR 0.271→0.376、前两名差距 0.013→0.128(同一份数据实测),
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// 且「词都在停用词里」的查询(稠密路给空向量)能靠词法路救回来。
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lex *vector.Store
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mu sync.RWMutex
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items map[string]*Knowledge
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summaries []string
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indexPath string
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vectorizer vector.Vectorizer // 可选:词嵌入向量化器,优先于 TF-IDF
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}
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func NewStore(root string) *Store {
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return &Store{
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root: root,
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indexPath: filepath.Join(root, ".index.json"),
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vec: vector.NewStore(),
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lex: newLexicalStore(),
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veczer: vector.NewTFIDFVectorizer(memory.TokenizeWords),
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items: make(map[string]*Knowledge),
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}
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}
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// newLexicalStore 造词法路存储。阈值设为 0:TF-IDF 余弦量级只有 0.0~0.2,
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// 沿用稠密路的 0.05 会把大量有效候选静默砍掉(实测 MRR 0.307→0.193)。
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func newLexicalStore() *vector.Store {
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st := vector.NewStore()
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st.SetMinScore(0)
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return st
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}
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// SetVectorizer 设置词嵌入向量化器,优先于 TF-IDF
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func (s *Store) SetVectorizer(v vector.Vectorizer) {
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s.vectorizer = v
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}
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// ReindexWithVectorizer 用给定的向量化器重建所有知识条目的向量索引
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func (s *Store) ReindexWithVectorizer(v vector.Vectorizer) {
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s.mu.Lock()
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defer s.mu.Unlock()
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log.Printf("[knowledge] reindex with vectorizer (%d items)", len(s.items))
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s.vec = vector.NewStore()
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s.lex = newLexicalStore()
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// 词法路的 IDF 必须建在全语料上(否则 IDF 没意义)
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if len(s.summaries) > 0 {
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s.veczer.Train(s.summaries)
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}
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for _, k := range s.items {
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text := k.Name + " " + k.Content
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s.vec.Insert(k.Name, k.Name+": "+k.Content, v.Vectorize(text), map[string]string{
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"name": k.Name, "path": k.Path,
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})
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s.lex.Insert(k.Name, k.Name+": "+k.Content, s.veczer.Vectorize(text), nil)
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}
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log.Printf("[knowledge] reindex complete (dense=%d lex=%d)", s.vec.Size(), s.lex.Size())
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}
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// vectorize 优先使用词嵌入向量化器,不可用时回退到 TF-IDF
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func (s *Store) vectorize(text string) vector.Vector {
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if s.vectorizer != nil {
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return s.vectorizer.Vectorize(text)
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}
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return s.veczer.Vectorize(text)
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}
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func (s *Store) Start() error {
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if err := os.MkdirAll(s.root, 0755); err != nil {
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return fmt.Errorf("knowledge root: %w", err)
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}
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if err := s.scanAll(); err != nil {
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log.Printf("[knowledge] scan error: %v", err)
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}
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// 重建索引文件
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if err := s.writeIndex(); err != nil {
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log.Printf("[knowledge] write index error: %v", err)
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}
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log.Printf("[knowledge] started with %d items, %d vectors", len(s.items), s.vec.Size())
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return nil
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}
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func (s *Store) Stop() {}
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// 融合权重:稠密路(词向量)与词法路(TF-IDF)。
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// 取值由真实 KB 上的权重扫描定(rankdiag_test.go 的 KB_DIAG_SWEEP):
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// 1.0 = 修复前的「只用稠密路」行为,作为对照基线。
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var densePathWeight = 0.5
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// Search 融合两路召回:稠密路(词向量/多模态空间)+ 词法路(TF-IDF)。
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//
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// 为何不能只用稠密路:词向量取平均后各向异性明显,真实 KB 上自检索 top-1 只有 15%,
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// 前两名平均只差 0.013(等于没区分度);且全为停用词的查询会得到**空向量**,
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// 直接搜不出任何东西("最近更新" 就撞上这个)。词法路对专名/术语/短查询强,
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// 两路各自**按查询内最大值归一化**后加权融合,排序才可信。
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func (s *Store) Search(query string, topK int) []*Knowledge {
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s.mu.RLock()
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defer s.mu.RUnlock()
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if topK <= 0 {
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topK = 5
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}
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if s.vec.Size() == 0 && s.lex.Size() == 0 {
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return nil
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}
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// 两路各自对**全部**文档打分:
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// - 稠密路的特征是维索引,几乎每篇都命中,"候选"就是全量;
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// - 词法路只召回与查询共词的文档(这正是它的长处:专名/术语)。
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// 为何不先截候选再融合:截断后只能拿**候选内**最大值归一化,路与路之间的
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// 相对权重就随候选集漂移——实测同一份 KB 上自检索 MRR 从 0.376 掉到 0.197。
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// KB 规模下全量 cosine 的代价可忽略;真到数万条再上 ANN 也不迟。
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denseHits := s.vec.SearchScored(s.vectorize(query), s.vec.Size())
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lexHits := s.lex.SearchScored(s.veczer.Vectorize(query), s.lex.Size())
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if len(denseHits) == 0 && len(lexHits) == 0 {
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return nil
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}
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scores := make(map[string]float64, len(denseHits)+len(lexHits))
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addPath := func(hits []vector.DocVectorHit, weight float64) {
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max := 0.0
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for _, h := range hits {
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if h.Score > max {
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max = h.Score
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}
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}
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if max <= 0 {
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return // 该路对这条查询没有信号(如空向量),全量让给另一路
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}
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for _, h := range hits {
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scores[h.Doc.ID] += weight * h.Score / max
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}
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}
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addPath(denseHits, densePathWeight)
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addPath(lexHits, 1-densePathWeight)
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ids := make([]string, 0, len(scores))
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for id := range scores {
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ids = append(ids, id)
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}
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sort.Slice(ids, func(i, j int) bool {
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if scores[ids[i]] != scores[ids[j]] {
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return scores[ids[i]] > scores[ids[j]]
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}
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return ids[i] < ids[j] // 分数相同时按名字定序(保证结果可重复)
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})
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var out []*Knowledge
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for _, id := range ids {
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if k, ok := s.items[id]; ok {
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out = append(out, k)
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}
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if len(out) >= topK {
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break
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}
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}
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return out
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}
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func (s *Store) Add(name, content string) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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// 解析层级:将 "/" 作为路径分隔符
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category := ""
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leaf := name
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if idx := strings.LastIndex(name, "/"); idx >= 0 {
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category = name[:idx]
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leaf = name[idx+1:]
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}
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dirName := sanitize(leaf)
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if category != "" {
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dirName = sanitize(category) + "/" + dirName
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}
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dir := filepath.Join(s.root, dirName)
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if err := os.MkdirAll(dir, 0755); err != nil {
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return fmt.Errorf("create knowledge dir: %w", err)
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}
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path := filepath.Join(dir, "content.md")
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if err := os.WriteFile(path, []byte(content), 0644); err != nil {
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return fmt.Errorf("write knowledge: %w", err)
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}
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now := time.Now()
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id := sanitize(name)
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k := &Knowledge{
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Name: id,
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Content: content,
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Path: path,
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Category: sanitize(category),
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Tags: memory.ExtractKeywords(name + " " + content),
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UpdatedAt: now,
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}
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s.items[id] = k
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// 覆盖同名条目时必须先摘掉旧向量。
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//
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// vector.Store.Insert 是**追加**语义(s.docs = append + index.Add),不按 id
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// 去重。少了这一步,更新一条知识会在向量索引里留下上一版的副本:条目数看起来
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// 是对的,只有向量数比条目数多——而检索可能因此命中已被替换掉的旧内容。
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s.vec.Remove(id)
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text := name + " " + content
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vec := s.vectorize(text)
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s.vec.Insert(id, name+": "+content, vec, map[string]string{
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"name": name, "path": path,
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})
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// 词法路同样去重后重建这条;IDF 统计沿用现有语料(重启时 scanAll 会全量重训)
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s.lex.Remove(id)
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s.lex.Insert(id, name+": "+content, s.veczer.Vectorize(text), nil)
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s.summaries = append(s.summaries, name+" "+content)
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if err := s.writeIndexLocked(); err != nil {
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log.Printf("[knowledge] write index error after adding %s: %v", name, err)
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}
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log.Printf("[knowledge] added: %s (%d bytes)", name, len(content))
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return nil
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}
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func (s *Store) SearchCategories(query string, topK int) []string {
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s.mu.RLock()
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defer s.mu.RUnlock()
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if query == "" {
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var names []string
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for _, k := range s.items {
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names = append(names, k.Name)
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}
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sort.Strings(names)
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if len(names) > topK {
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names = names[:topK]
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}
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return names
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}
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vec := s.vectorize(query)
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results := s.vec.Search(vec, topK)
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var names []string
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for _, r := range results {
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if k, ok := s.items[r.ID]; ok {
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names = append(names, k.Name)
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}
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}
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return names
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}
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func (s *Store) Remove(name string) error {
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s.mu.Lock()
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defer s.mu.Unlock()
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id := sanitize(name)
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dir := filepath.Join(s.root, id)
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if err := os.RemoveAll(dir); err != nil {
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return err
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}
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delete(s.items, id)
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s.vec.Remove(id)
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s.lex.Remove(id)
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if err := s.writeIndexLocked(); err != nil {
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log.Printf("[knowledge] write index error after removing %s: %v", name, err)
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}
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return nil
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}
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func (s *Store) Stats() map[string]interface{} {
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s.mu.RLock()
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defer s.mu.RUnlock()
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return map[string]interface{}{
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"knowledge_count": len(s.items),
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"vector_count": s.vec.Size(),
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"root": s.root,
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"index_file": s.indexPath,
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}
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}
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func (s *Store) List() []string {
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s.mu.RLock()
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defer s.mu.RUnlock()
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var names []string
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for _, k := range s.items {
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names = append(names, k.Name)
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}
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sort.Strings(names)
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return names
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}
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// BuildTree 从当前知识库构建树状索引(含向量特征)
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func (s *Store) BuildTree() *TreeIndex {
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s.mu.RLock()
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defer s.mu.RUnlock()
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return s.buildTreeLocked()
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}
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// buildTreeLocked 与 BuildTree 同义,但**不取锁**——供已持写锁的路径调用。
|
||
// 为什么需要:writeIndex 会走 BuildTree(RLock),而 Add/Remove 持的是写锁,
|
||
// 直接调用会死锁;此前就是因此把索引写丢进了无追踪的 goroutine 里,
|
||
// 结果是「失败只打日志」+ 与调用方(含测试的临时目录清理)竞态。
|
||
func (s *Store) buildTreeLocked() *TreeIndex {
|
||
root := newTreeIndex("root")
|
||
for _, k := range s.items {
|
||
node := root
|
||
if k.Category != "" {
|
||
parts := strings.Split(k.Category, "/")
|
||
for _, part := range parts {
|
||
if part == "" {
|
||
continue
|
||
}
|
||
if _, ok := node.Children[part]; !ok {
|
||
node.Children[part] = newTreeIndex(part)
|
||
}
|
||
node = node.Children[part]
|
||
}
|
||
}
|
||
// 获取该条目的向量并压缩
|
||
vec := s.vectorize(k.Name + " " + k.Content)
|
||
preview := []rune(k.Content)
|
||
previewStr := ""
|
||
if len(preview) > 200 {
|
||
previewStr = string(preview[:200]) + "..."
|
||
} else {
|
||
previewStr = string(preview)
|
||
}
|
||
item := IndexItem{
|
||
Name: k.Name,
|
||
Preview: previewStr,
|
||
Tags: k.Tags,
|
||
Vector: compressVector(vec, 20),
|
||
Size: len(k.Content),
|
||
}
|
||
node.Items = append(node.Items, item)
|
||
}
|
||
return root
|
||
}
|
||
|
||
// SearchTree 树状搜索:在树节点下搜索,返回按分类聚合的结果
|
||
func (s *Store) SearchTree(query string, topK int) map[string][]*Knowledge {
|
||
s.mu.RLock()
|
||
defer s.mu.RUnlock()
|
||
|
||
if topK <= 0 {
|
||
topK = 10
|
||
}
|
||
|
||
vec := s.vectorize(query)
|
||
results := s.vec.Search(vec, topK*2)
|
||
|
||
categorized := make(map[string][]*Knowledge)
|
||
for _, r := range results {
|
||
if k, ok := s.items[r.ID]; ok {
|
||
cat := k.Category
|
||
if cat == "" {
|
||
cat = "未分类"
|
||
}
|
||
categorized[cat] = append(categorized[cat], k)
|
||
}
|
||
}
|
||
|
||
out := make(map[string][]*Knowledge)
|
||
for cat, items := range categorized {
|
||
if len(items) > topK {
|
||
items = items[:topK]
|
||
}
|
||
out[cat] = items
|
||
}
|
||
return out
|
||
}
|
||
|
||
// writeIndex 写入 .index.json 树状索引文件(含向量和摘要)
|
||
func (s *Store) writeIndex() error {
|
||
s.mu.RLock()
|
||
defer s.mu.RUnlock()
|
||
return s.writeIndexLocked()
|
||
}
|
||
|
||
// writeIndexLocked 与 writeIndex 同义但**不取锁**(调用方已持锁)。
|
||
func (s *Store) writeIndexLocked() error {
|
||
tree := s.buildTreeLocked()
|
||
data, err := json.MarshalIndent(tree, "", " ")
|
||
if err != nil {
|
||
return err
|
||
}
|
||
return os.WriteFile(s.indexPath, data, 0644)
|
||
}
|
||
|
||
// ——— internal ———
|
||
|
||
func (s *Store) scanAll() error {
|
||
entries, err := os.ReadDir(s.root)
|
||
if err != nil {
|
||
return err
|
||
}
|
||
|
||
for _, entry := range entries {
|
||
if !entry.IsDir() {
|
||
continue
|
||
}
|
||
// skip hidden dirs
|
||
if strings.HasPrefix(entry.Name(), ".") {
|
||
continue
|
||
}
|
||
s.scanDir("", entry.Name())
|
||
}
|
||
|
||
if len(s.summaries) > 0 {
|
||
s.veczer.Train(s.summaries)
|
||
}
|
||
|
||
s.lex = newLexicalStore()
|
||
for _, k := range s.items {
|
||
text := k.Name + " " + k.Content
|
||
s.vec.Insert(k.Name, k.Name+": "+k.Content, s.vectorize(text), map[string]string{
|
||
"name": k.Name, "path": k.Path,
|
||
})
|
||
s.lex.Insert(k.Name, k.Name+": "+k.Content, s.veczer.Vectorize(text), nil)
|
||
}
|
||
|
||
return nil
|
||
}
|
||
|
||
// scanDir 递归扫描目录
|
||
// category: 父级路径(从知识库根目录算起),如 "tech/go"
|
||
// dirName: 当前目录相对路径(从知识库根目录算起)
|
||
func (s *Store) scanDir(category, dirName string) {
|
||
dir := filepath.Join(s.root, dirName)
|
||
contentPath := filepath.Join(dir, "content.md")
|
||
data, err := os.ReadFile(contentPath)
|
||
if err == nil {
|
||
name := dirName
|
||
content := string(data)
|
||
now := time.Now()
|
||
k := &Knowledge{
|
||
Name: name,
|
||
Content: content,
|
||
Path: contentPath,
|
||
Category: category,
|
||
Tags: memory.ExtractKeywords(dirName + " " + content),
|
||
UpdatedAt: now,
|
||
}
|
||
s.items[name] = k
|
||
s.summaries = append(s.summaries, name+" "+content)
|
||
return
|
||
}
|
||
|
||
// 无 content.md => 是分类目录,递归子目录
|
||
subEntries, err := os.ReadDir(dir)
|
||
if err != nil {
|
||
return
|
||
}
|
||
for _, sub := range subEntries {
|
||
if !sub.IsDir() || strings.HasPrefix(sub.Name(), ".") {
|
||
continue
|
||
}
|
||
childDir := dirName + "/" + sub.Name()
|
||
s.scanDir(dirName, childDir)
|
||
}
|
||
}
|
||
|
||
func sanitize(name string) string {
|
||
name = strings.ToLower(name)
|
||
name = strings.TrimSpace(name)
|
||
name = strings.ReplaceAll(name, " ", "_")
|
||
name = strings.ReplaceAll(name, "\\", "_")
|
||
return name
|
||
}
|