267 lines
6.8 KiB
Go
267 lines
6.8 KiB
Go
package rag
|
|
|
|
import (
|
|
"bytes"
|
|
"elefant/config"
|
|
"elefant/models"
|
|
"elefant/storage"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"log/slog"
|
|
"net/http"
|
|
"os"
|
|
"path"
|
|
"strings"
|
|
|
|
"github.com/neurosnap/sentences/english"
|
|
)
|
|
|
|
type RAG struct {
|
|
logger *slog.Logger
|
|
store storage.FullRepo
|
|
cfg *config.Config
|
|
}
|
|
|
|
func New(l *slog.Logger, s storage.FullRepo, cfg *config.Config) *RAG {
|
|
return &RAG{
|
|
logger: l,
|
|
store: s,
|
|
cfg: cfg,
|
|
}
|
|
}
|
|
|
|
func wordCounter(sentence string) int {
|
|
return len(strings.Split(sentence, " "))
|
|
}
|
|
|
|
func (r *RAG) LoadRAG(fpath string) error {
|
|
data, err := os.ReadFile(fpath)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
r.logger.Info("rag: loaded file", "fp", fpath)
|
|
fileText := string(data)
|
|
tokenizer, err := english.NewSentenceTokenizer(nil)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
sentences := tokenizer.Tokenize(fileText)
|
|
sents := make([]string, len(sentences))
|
|
r.logger.Info("rag: sentences", "#", len(sents))
|
|
for i, s := range sentences {
|
|
sents[i] = s.Text
|
|
}
|
|
// TODO: maybe better to decide batch size based on sentences len
|
|
var (
|
|
// TODO: to config
|
|
workers = 5
|
|
batchSize = 200
|
|
maxChSize = 1000
|
|
//
|
|
// psize = 3
|
|
wordLimit = 80
|
|
//
|
|
left = 0
|
|
right = batchSize
|
|
batchCh = make(chan map[int][]string, maxChSize)
|
|
vectorCh = make(chan []models.VectorRow, maxChSize)
|
|
errCh = make(chan error, 1)
|
|
doneCh = make(chan bool, 1)
|
|
)
|
|
// group sentences
|
|
paragraphs := []string{}
|
|
par := strings.Builder{}
|
|
for i := 0; i < len(sents); i++ {
|
|
par.WriteString(sents[i])
|
|
if wordCounter(par.String()) > wordLimit {
|
|
paragraphs = append(paragraphs, par.String())
|
|
par.Reset()
|
|
}
|
|
}
|
|
// for i := 0; i < len(sents); i += psize {
|
|
// if len(sents) < i+psize {
|
|
// paragraphs = append(paragraphs, strings.Join(sents[i:], " "))
|
|
// break
|
|
// }
|
|
// paragraphs = append(paragraphs, strings.Join(sents[i:i+psize], " "))
|
|
// }
|
|
if len(paragraphs) < batchSize {
|
|
batchSize = len(paragraphs)
|
|
}
|
|
// fill input channel
|
|
ctn := 0
|
|
for {
|
|
if right > len(paragraphs) {
|
|
batchCh <- map[int][]string{left: paragraphs[left:]}
|
|
break
|
|
}
|
|
batchCh <- map[int][]string{left: paragraphs[left:right]}
|
|
left, right = right, right+batchSize
|
|
ctn++
|
|
}
|
|
r.logger.Info("finished batching", "batches#", len(batchCh))
|
|
for w := 0; w < workers; w++ {
|
|
go r.batchToVectorHFAsync(len(paragraphs), batchCh, vectorCh, errCh, doneCh, path.Base(fpath))
|
|
}
|
|
// write to db
|
|
return r.writeVectors(vectorCh, doneCh)
|
|
}
|
|
|
|
func (r *RAG) writeVectors(vectorCh <-chan []models.VectorRow, doneCh <-chan bool) error {
|
|
for {
|
|
select {
|
|
case batch := <-vectorCh:
|
|
for _, vector := range batch {
|
|
if err := r.store.WriteVector(&vector); err != nil {
|
|
r.logger.Error("failed to write vector", "error", err, "slug", vector.Slug)
|
|
continue // a duplicate is not critical
|
|
// return err
|
|
}
|
|
}
|
|
r.logger.Info("wrote batch to db", "size", len(batch))
|
|
case <-doneCh:
|
|
r.logger.Info("rag finished")
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
func (r *RAG) batchToVectorHFAsync(limit int, inputCh <-chan map[int][]string,
|
|
vectorCh chan<- []models.VectorRow, errCh chan error, doneCh chan bool, filename string) {
|
|
r.logger.Info("to vector batches", "batches#", len(inputCh))
|
|
for {
|
|
select {
|
|
case linesMap := <-inputCh:
|
|
for leftI, v := range linesMap {
|
|
r.fecthEmbHF(v, errCh, vectorCh, fmt.Sprintf("%s_%d", filename, leftI), filename)
|
|
if leftI+200 >= limit { // last batch
|
|
doneCh <- true
|
|
return
|
|
}
|
|
}
|
|
case <-doneCh:
|
|
r.logger.Info("got done")
|
|
close(errCh)
|
|
close(doneCh)
|
|
return
|
|
case err := <-errCh:
|
|
r.logger.Error("got an error", "error", err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (r *RAG) fecthEmbHF(lines []string, errCh chan error, vectorCh chan<- []models.VectorRow, slug, filename string) {
|
|
payload, err := json.Marshal(
|
|
map[string]any{"inputs": lines, "options": map[string]bool{"wait_for_model": true}},
|
|
)
|
|
if err != nil {
|
|
r.logger.Error("failed to marshal payload", "err:", err.Error())
|
|
errCh <- err
|
|
return
|
|
}
|
|
// nolint
|
|
req, err := http.NewRequest("POST", r.cfg.EmbedURL, bytes.NewReader(payload))
|
|
if err != nil {
|
|
r.logger.Error("failed to create new req", "err:", err.Error())
|
|
errCh <- err
|
|
return
|
|
}
|
|
req.Header.Add("Authorization", "Bearer "+r.cfg.HFToken)
|
|
resp, err := http.DefaultClient.Do(req)
|
|
// nolint
|
|
// resp, err := httpClient.Post(cfg.EmbedURL, "application/json", bytes.NewReader(payload))
|
|
if err != nil {
|
|
r.logger.Error("failed to embedd line", "err:", err.Error())
|
|
errCh <- err
|
|
return
|
|
}
|
|
defer resp.Body.Close()
|
|
if resp.StatusCode != 200 {
|
|
r.logger.Error("non 200 resp", "code", resp.StatusCode)
|
|
return
|
|
// err = fmt.Errorf("non 200 resp; url: %s; code %d", r.cfg.EmbedURL, resp.StatusCode)
|
|
// errCh <- err
|
|
// return
|
|
}
|
|
emb := [][]float32{}
|
|
if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
|
|
r.logger.Error("failed to embedd line", "err:", err.Error())
|
|
errCh <- err
|
|
return
|
|
}
|
|
if len(emb) == 0 {
|
|
r.logger.Error("empty emb")
|
|
err = errors.New("empty emb")
|
|
errCh <- err
|
|
return
|
|
}
|
|
vectors := make([]models.VectorRow, len(emb))
|
|
for i, e := range emb {
|
|
vector := models.VectorRow{
|
|
Embeddings: e,
|
|
RawText: lines[i],
|
|
Slug: slug,
|
|
FileName: filename,
|
|
}
|
|
vectors[i] = vector
|
|
}
|
|
vectorCh <- vectors
|
|
}
|
|
|
|
func (r *RAG) LineToVector(line string) ([]float32, error) {
|
|
// payload, err := json.Marshal(map[string]string{"content": line})
|
|
lines := []string{line}
|
|
payload, err := json.Marshal(
|
|
map[string]any{"inputs": lines, "options": map[string]bool{"wait_for_model": true}},
|
|
)
|
|
if err != nil {
|
|
r.logger.Error("failed to marshal payload", "err:", err.Error())
|
|
return nil, err
|
|
}
|
|
// nolint
|
|
req, err := http.NewRequest("POST", r.cfg.EmbedURL, bytes.NewReader(payload))
|
|
if err != nil {
|
|
r.logger.Error("failed to create new req", "err:", err.Error())
|
|
return nil, err
|
|
}
|
|
req.Header.Add("Authorization", "Bearer "+r.cfg.HFToken)
|
|
resp, err := http.DefaultClient.Do(req)
|
|
// resp, err := req.Post(r.cfg.EmbedURL, "application/json", bytes.NewReader(payload))
|
|
if err != nil {
|
|
r.logger.Error("failed to embedd line", "err:", err.Error())
|
|
return nil, err
|
|
}
|
|
defer resp.Body.Close()
|
|
if resp.StatusCode != 200 {
|
|
err = fmt.Errorf("non 200 resp; code: %v\n", resp.StatusCode)
|
|
r.logger.Error(err.Error())
|
|
return nil, err
|
|
}
|
|
// emb := models.EmbeddingResp{}
|
|
emb := [][]float32{}
|
|
if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
|
|
r.logger.Error("failed to embedd line", "err:", err.Error())
|
|
return nil, err
|
|
}
|
|
if len(emb) == 0 || len(emb[0]) == 0 {
|
|
r.logger.Error("empty emb")
|
|
err = errors.New("empty emb")
|
|
return nil, err
|
|
}
|
|
return emb[0], nil
|
|
}
|
|
|
|
func (r *RAG) SearchEmb(emb *models.EmbeddingResp) ([]models.VectorRow, error) {
|
|
return r.store.SearchClosest(emb.Embedding)
|
|
}
|
|
|
|
func (r *RAG) ListLoaded() ([]string, error) {
|
|
return r.store.ListFiles()
|
|
}
|
|
|
|
func (r *RAG) RemoveFile(filename string) error {
|
|
return r.store.RemoveEmbByFileName(filename)
|
|
}
|