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package main
import (
"context"
"database/sql"
"log"
"math"
"slices"
_ "github.com/duckdb/duckdb-go/v2"
"go.jknobloc.com/x/llm"
)
type logProb struct {
document int
token int
value float32
offset int
}
type logProbs []logProb
func logprobs() {
d := data()
m := model()
t := tokenizer()
e := llm.NewEvaluator(m, t, func(j llm.Job, logits [][]float32, tokens []int) logProbs {
probs := selectLogProbs(logits, tokens)
r := make(logProbs, len(tokens))
for i, token := range tokens {
r[i] = logProb{
document: j.Document,
token: token,
value: probs[i],
offset: i,
}
}
return r
})
var insertStmt *sql.Stmt
if stmt, db, err := prepare("logprobs.db?access_mode=READ_WRITE"); err != nil {
log.Fatal(err)
} else {
insertStmt = stmt
defer db.Close()
defer stmt.Close()
}
if err := e.RunAndCollect("LogProbs", d, 1024, 512, func(r logProbs) error {
for _, l := range r {
if err := insert(insertStmt, l); err != nil {
return err
}
}
return nil
}); err != nil {
log.Fatal(err)
}
}
func prepare(name string) (*sql.Stmt, *sql.DB, error) {
var db *sql.DB
if database, err := sql.Open("duckdb", name); err != nil {
return nil, nil, err
} else {
db = database
}
if err := db.Ping(); err != nil {
_ = db.Close()
return nil, nil, err
}
queryCreate := "CREATE TABLE context(uid INTEGER, token INTEGER, logProb FLOAT, pos INTEGER)"
if _, err := db.ExecContext(context.Background(), queryCreate); err != nil {
_ = db.Close()
return nil, nil, err
}
var stmt *sql.Stmt
queryInsert := "INSERT INTO context VALUES(?, ?, ?, ?)"
if statement, err := db.PrepareContext(context.Background(), queryInsert); err != nil {
_ = db.Close()
return nil, nil, err
} else {
stmt = statement
}
return stmt, db, nil
}
func insert(stmt *sql.Stmt, prob logProb) error {
if _, err := stmt.ExecContext(context.Background(), prob.document, prob.token, prob.value, prob.offset); err != nil {
return err
}
return nil
}
func selectLogProbs(logits [][]float32, tokens []int) []float32 {
if len(logits) != len(tokens) {
panic("length mismatch")
}
r := make([]float32, len(tokens))
for i, token := range tokens {
logprobs := logSoftmax(logits[i])
r[i] = logprobs[token]
}
return r
}
func logSoftmax(logits []float32) []float32 {
m := slices.Max(logits)
s := float32(0.0)
r := make([]float32, len(logits))
for i, v := range logits {
e := float32(math.Exp(float64(v - m)))
r[i] = v
s += e
}
lse := float32(math.Log(float64(s))) + m
for i := range r {
r[i] -= lse
}
return r
}
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