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basicTokenizer.go
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basicTokenizer.go
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package go_bert_tokenizer
import (
"strings"
"unicode"
"golang.org/x/text/unicode/norm"
)
type BasicTokenizer struct {
Lower bool
}
func NewBasicTokenizer(lower bool) *BasicTokenizer {
return &BasicTokenizer{Lower: lower}
}
func (tkz *BasicTokenizer) Tokenize(text string) []string {
text = clean(text)
text = padChinese(text)
var toks []string
for _, tok := range tokenizeWhitespace(text) {
if tkz.Lower {
tok = strings.ToLower(tok)
tok = stripAccents(tok)
}
toks = append(toks, splitPunc(tok)...)
}
toks = tokenizeWhitespace(strings.Join(toks, " "))
return toks
}
func clean(text string) string {
var b strings.Builder
for _, c := range text {
if c == 0 || c == 0xfffd || isControl(c) {
continue
} else if isWhitespace(c) {
b.WriteRune(' ')
} else {
b.WriteRune(c)
}
}
return b.String()
}
func stripAccents(text string) string {
var b strings.Builder
for _, c := range norm.NFD.String(text) {
if !unicode.Is(unicode.Mn, c) {
b.WriteRune(c)
}
}
return b.String()
}
func splitPunc(text string) []string {
var toks []string
var b strings.Builder
for _, c := range text {
if isPunctuation(c) {
toks = append(toks, b.String())
toks = append(toks, string(c))
b.Reset()
} else {
b.WriteRune(c)
}
}
if b.Len() > 0 {
toks = append(toks, b.String())
}
return toks
}
func tokenizeWhitespace(text string) []string {
split := strings.Split(text, " ")
var toks []string
for _, tok := range split {
if tok != "" {
toks = append(toks, tok)
}
}
return toks
}
func padChinese(text string) string {
var b strings.Builder
for _, c := range text {
if isChinese(c) {
b.WriteRune(' ')
b.WriteRune(c)
b.WriteRune(' ')
} else {
b.WriteRune(c)
}
}
return b.String()
}