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package model
import (
"log/slog"
"slices"
"sync"
)
type Special int32
const (
SpecialBOS Special = iota
SpecialEOS
)
type Vocabulary struct {
Values []string
Types []int32
Scores []float32
Merges []string
BOS, EOS []int32
AddBOS, AddEOS bool
specialOnce sync.Once
special []string
valuesOnce sync.Once
values map[string]int32
mergeOnce sync.Once
merge map[string]int32
}
func (v *Vocabulary) Is(id int32, special Special) bool {
switch special {
case SpecialBOS:
return slices.Contains(v.BOS, id)
case SpecialEOS:
return slices.Contains(v.EOS, id)
default:
return false
}
}
func (v *Vocabulary) addSpecials(ids []int32) []int32 {
if v.AddBOS && len(v.BOS) > 0 {
if slices.Contains(v.BOS, ids[0]) {
slog.Warn("adding bos token to prompt which already has it", "id", v.BOS)
}
slog.Debug("adding bos token to prompt", "id", v.BOS)
ids = append([]int32{v.BOS[0]}, ids...)
}
if v.AddEOS && len(v.EOS) > 0 {
if slices.Contains(v.BOS, ids[len(ids)-1]) {
slog.Warn("adding eos token to prompt which already has it", "id", v.EOS)
}
slog.Debug("adding eos token to prompt", "id", v.EOS)
ids = append(ids, v.EOS[0])
}
return ids
}
func (v *Vocabulary) Encode(s string) int32 {
v.valuesOnce.Do(func() {
v.values = make(map[string]int32, len(v.Values))
for i, value := range v.Values {
v.values[value] = int32(i)
}
})
if id, ok := v.values[s]; ok {
return id
}
return -1
}
func (v *Vocabulary) Decode(id int32) string {
return v.Values[id]
}
func (v *Vocabulary) SpecialVocabulary() []string {
v.specialOnce.Do(func() {
for i := range v.Values {
if v.Types[i] == TOKEN_TYPE_CONTROL {
v.special = append(v.special, v.Values[i])
}
}
})
return v.special
}
func (v *Vocabulary) Merge(left, right string) int {
v.mergeOnce.Do(func() {
v.merge = make(map[string]int32, len(v.Merges))
for i, merge := range v.Merges {
v.merge[merge] = int32(i)
}
})
if id, ok := v.merge[left+" "+right]; ok {
return int(id)
}
return -1
}