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package bpe
import (
"fmt"
"slices"
"github.com/jonasknobloch/mbpe"
)
func InitialAlphabet() []rune {
alphabet := make([]rune, 256)
bc := mbpe.BytesChar
for i := 0; i < 256; i++ {
b := uint8(i)
runes := []rune(bc[b])
if len(runes) != 1 {
panic("unexpected replacement")
}
alphabet[i] = runes[0]
}
slices.Sort(alphabet)
return alphabet
}
func UnknownRunes(t *Tokenizer, s string) []rune {
atoi := Atoi(t)
unknown := make(map[rune]struct{})
chunks := t.mbpe.PreTokenizer().PreTokenize(s)
for _, chunk := range chunks {
for _, r := range chunk {
i, ok := atoi[string(r)]
if !ok {
fmt.Printf("%d %s %v not in vocabulary\n", i, string(r), []byte(string(r)))
if _, ok := unknown[r]; ok {
continue
}
unknown[r] = struct{}{}
}
}
}
result := make([]rune, 0, len(unknown))
for r := range unknown {
result = append(result, r)
}
slices.Sort(result)
return result
}
func ByteCoverage(t *Tokenizer) bool {
atoi := Atoi(t)
bc := mbpe.BytesChar
covered := true
for i := 0; i < 256; i++ {
c, ok := bc[byte(i)]
if !ok {
panic("not in replacement table")
}
if _, ok := atoi[c]; !ok {
fmt.Printf("%d %s %v not in vocabulary\n", i, c, []byte(c))
covered = false
}
}
return covered
}
func ReachableMerges(t *Tokenizer, merges [][2]string) []bool {
atoi := Atoi(t)
reachable := make(map[string]struct{})
for _, a := range InitialAlphabet() {
if _, ok := atoi[string(a)]; ok {
reachable[string(a)] = struct{}{}
}
}
mask := make([]bool, len(merges))
for i, merge := range merges {
_, a := reachable[merge[0]]
_, b := reachable[merge[1]]
if !a || !b {
continue
}
reachable[merge[0]+merge[1]] = struct{}{}
mask[i] = true
}
return mask
}
func Atoi(t *Tokenizer) map[string]int64 {
atoi := make(map[string]int64)
for i, token := range Vocab(t) {
if _, ok := atoi[token]; ok {
panic("duplicate token")
}
atoi[token] = int64(i)
}
return atoi
}
func Itoa(t *Tokenizer) map[int64]string {
itoa := make(map[int64]string)
for i, token := range Vocab(t) {
itoa[int64(i)] = token
}
return itoa
}
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