use crate::error::TokenizerError;
use crate::vocab::base_vocab::{
read_protobuf_file, read_special_token_mapping_file, swap_key_values, SpecialTokenMap,
};
use crate::vocab::Vocab;
use std::collections::{HashMap, HashSet};
use std::path::Path;
#[allow(clippy::upper_case_acronyms)]
#[derive(Debug, Clone)]
pub struct XLNetVocab {
pub values: HashMap<String, i64>,
pub indices: HashMap<i64, String>,
pub special_token_map: SpecialTokenMap,
pub special_values: HashMap<String, i64>,
pub special_indices: HashMap<i64, String>,
}
const DEFAULT_UNK_TOKEN: &str = "<unk>";
const DEFAULT_PAD_TOKEN: &str = "<pad>";
const DEFAULT_BOS_TOKEN: &str = "<s>";
const DEFAULT_SEP_TOKEN: &str = "<sep>";
const DEFAULT_CLS_TOKEN: &str = "<cls>";
const DEFAULT_EOS_TOKEN: &str = "</s>";
const DEFAULT_EOP_TOKEN: &str = "<eop>";
const DEFAULT_EOD_TOKEN: &str = "<eod>";
const DEFAULT_MASK_TOKEN: &str = "<mask>";
impl XLNetVocab {
pub fn get_pad_value(&self) -> &str {
self.special_token_map
.pad_token
.as_deref()
.unwrap_or(DEFAULT_PAD_TOKEN)
}
pub fn get_bos_value(&self) -> &str {
self.special_token_map
.bos_token
.as_deref()
.unwrap_or(DEFAULT_BOS_TOKEN)
}
pub fn get_sep_value(&self) -> &str {
self.special_token_map
.sep_token
.as_deref()
.unwrap_or(DEFAULT_SEP_TOKEN)
}
pub fn get_cls_value(&self) -> &str {
self.special_token_map
.cls_token
.as_deref()
.unwrap_or(DEFAULT_CLS_TOKEN)
}
pub fn get_eos_value(&self) -> &str {
self.special_token_map
.eos_token
.as_deref()
.unwrap_or(DEFAULT_EOS_TOKEN)
}
pub fn get_mask_value(&self) -> &str {
self.special_token_map
.mask_token
.as_deref()
.unwrap_or(DEFAULT_MASK_TOKEN)
}
}
impl Vocab for XLNetVocab {
fn get_unknown_value(&self) -> &str {
&self.special_token_map.unk_token
}
fn values(&self) -> &HashMap<String, i64> {
&self.values
}
fn indices(&self) -> &HashMap<i64, String> {
&self.indices
}
fn special_values(&self) -> &HashMap<String, i64> {
&self.special_values
}
fn special_indices(&self) -> &HashMap<i64, String> {
&self.special_indices
}
fn from_file<P: AsRef<Path>>(path: P) -> Result<XLNetVocab, TokenizerError> {
let values = read_protobuf_file(path)?;
let special_token_map = SpecialTokenMap {
unk_token: DEFAULT_UNK_TOKEN.to_string(),
pad_token: Some(DEFAULT_PAD_TOKEN.to_string()),
bos_token: Some(DEFAULT_BOS_TOKEN.to_string()),
sep_token: Some(DEFAULT_SEP_TOKEN.to_string()),
cls_token: Some(DEFAULT_CLS_TOKEN.to_string()),
eos_token: Some(DEFAULT_EOS_TOKEN.to_string()),
mask_token: Some(DEFAULT_MASK_TOKEN.to_string()),
additional_special_tokens: Some(HashSet::from([
DEFAULT_EOP_TOKEN.to_string(),
DEFAULT_EOD_TOKEN.to_string(),
])),
};
Self::from_values_and_special_token_map(values, special_token_map)
}
fn from_file_with_special_token_mapping<P: AsRef<Path>, S: AsRef<Path>>(
path: P,
special_token_mapping_path: S,
) -> Result<Self, TokenizerError> {
let values = read_protobuf_file(path)?;
let special_token_map = read_special_token_mapping_file(special_token_mapping_path)?;
Self::from_values_and_special_token_map(values, special_token_map)
}
fn from_values_and_special_token_map(
values: HashMap<String, i64>,
special_token_map: SpecialTokenMap,
) -> Result<Self, TokenizerError>
where
Self: Sized,
{
let mut special_values = HashMap::new();
special_token_map.register_special_values(&values, &mut special_values)?;
let indices = swap_key_values(&values);
let special_indices = swap_key_values(&special_values);
Ok(Self {
values,
indices,
special_token_map,
special_values,
special_indices,
})
}
fn token_to_id(&self, token: &str) -> i64 {
self._token_to_id(
token,
&self.values,
&self.special_values,
self.get_unknown_value(),
)
}
fn id_to_token(&self, id: &i64) -> String {
self._id_to_token(
id,
&self.indices,
&self.special_indices,
self.get_unknown_value(),
)
}
}