use std::collections::HashMap;
use crate::preprocessing::vocab::base_vocab::{Vocab, swap_key_values};
use std::process;
use std::fs::File;
use std::io::BufReader;
pub struct RobertaVocab {
pub values: HashMap<String, i64>,
pub indices: HashMap<i64, String>,
pub unknown_value: &'static str,
pub special_values: HashMap<String, i64>,
pub special_indices: HashMap<i64, String>,
}
impl RobertaVocab {
pub fn pad_value() -> &'static str { "<pad>" }
pub fn bos_value() -> &'static str { "<s>" }
pub fn eos_value() -> &'static str { "</s>" }
pub fn sep_value() -> &'static str { "</s>" }
pub fn cls_value() -> &'static str { "<s>" }
pub fn mask_value() -> &'static str { "<mask>" }
}
impl Vocab for RobertaVocab {
fn unknown_value() -> &'static str { "<unk>" }
fn get_unknown_value(&self) -> &'static str { "<unk>" }
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(path: &str) -> RobertaVocab {
let f = File::open(path).expect("Could not open vocabulary file.");
let br = BufReader::new(f);
let values: HashMap<String, i64> = serde_json::from_reader(br).expect("could not parse vocabulary");
let mut special_values = HashMap::new();
let unknown_value = RobertaVocab::unknown_value();
RobertaVocab::_register_as_special_value(unknown_value, &values, &mut special_values);
let pad_value = RobertaVocab::pad_value();
RobertaVocab::_register_as_special_value(pad_value, &values, &mut special_values);
let sep_value = RobertaVocab::sep_value();
RobertaVocab::_register_as_special_value(sep_value, &values, &mut special_values);
let cls_value = RobertaVocab::cls_value();
RobertaVocab::_register_as_special_value(cls_value, &values, &mut special_values);
let mask_value = RobertaVocab::mask_value();
RobertaVocab::_register_as_special_value(mask_value, &values, &mut special_values);
let bos_value = RobertaVocab::bos_value();
RobertaVocab::_register_as_special_value(bos_value, &values, &mut special_values);
let eos_value = RobertaVocab::eos_value();
RobertaVocab::_register_as_special_value(eos_value, &values, &mut special_values);
let indices = swap_key_values(&values);
let special_indices = swap_key_values(&special_values);
RobertaVocab { values, indices, unknown_value, special_values, special_indices }
}
fn token_to_id(&self, token: &str) -> i64 {
match self._token_to_id(token, &self.values, &self.special_values, &self.unknown_value) {
Ok(index) => index,
Err(err) => {
println!("{}", err);
process::exit(1);
}
}
}
fn id_to_token(&self, id: &i64) -> String {
match self._id_to_token(&id, &self.indices, &self.special_indices, &self.unknown_value) {
Ok(token) => token,
Err(err) => {
println!("{}", err);
process::exit(1);
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::io;
use std::io::Write;
#[test]
fn test_create_vocab() {
let values: HashMap<String, i64> = HashMap::new();
let special_values: HashMap<String, i64> = HashMap::new();
let indices: HashMap<i64, String> = HashMap::new();
let special_indices: HashMap<i64, String> = HashMap::new();
let unknown_value = RobertaVocab::unknown_value();
let roberta_vocab = RobertaVocab {
values,
indices,
unknown_value,
special_indices,
special_values,
};
assert_eq!(roberta_vocab.unknown_value, "<unk>");
assert_eq!(RobertaVocab::pad_value(), "<pad>");
assert_eq!(RobertaVocab::sep_value(), "</s>");
assert_eq!(RobertaVocab::bos_value(), "<s>");
assert_eq!(RobertaVocab::eos_value(), "</s>");
assert_eq!(RobertaVocab::cls_value(), "<s>");
assert_eq!(RobertaVocab::mask_value(), "<mask>");
assert_eq!(roberta_vocab.unknown_value, RobertaVocab::unknown_value());
assert_eq!(roberta_vocab.values, *roberta_vocab.values());
assert_eq!(roberta_vocab.special_values, *roberta_vocab.special_values());
}
#[test]
fn test_create_object_from_file() -> Result<(), io::Error> {
let mut vocab_file = tempfile::NamedTempFile::new()?;
write!(vocab_file, "{{\"hello\": 1,\n \"world\": 0,\n \"<unk>\": 2,\n \"!\": 3\n, \"<pad>\": 4\n, \"<s>\": 5\n, \"</s>\": 6\n, \"<mask>\": 7\n}}")?;
let path = vocab_file.into_temp_path();
let target_values: HashMap<String, i64> = [
("hello".to_owned(), 1),
("world".to_owned(), 0),
("<unk>".to_owned(), 2),
("!".to_owned(), 3),
("<pad>".to_owned(), 4),
("<s>".to_owned(), 5),
("</s>".to_owned(), 6),
("<mask>".to_owned(), 7),
].iter().cloned().collect();
let special_values: HashMap<String, i64> = [
("<unk>".to_owned(), 2),
("<pad>".to_owned(), 4),
("<s>".to_owned(), 5),
("</s>".to_owned(), 6),
("<mask>".to_owned(), 7),
].iter().cloned().collect();
let roberta_vocab = RobertaVocab::from_file(path.to_path_buf().to_str().unwrap());
assert_eq!(roberta_vocab.unknown_value, "<unk>");
assert_eq!(roberta_vocab.values, target_values);
assert_eq!(roberta_vocab.special_values, special_values);
drop(path);
Ok(())
}
#[test]
#[should_panic]
fn test_create_object_from_file_without_unknown_token() {
let mut vocab_file = tempfile::NamedTempFile::new().unwrap();
write!(vocab_file, "{{\"hello\": 1,\n \"world\": 0,\n \"!\": 3\n}}").unwrap();
let path = vocab_file.into_temp_path();
let _roberta_vocab = RobertaVocab::from_file(path.to_path_buf().to_str().unwrap());
}
#[test]
fn test_encode_tokens() -> Result<(), io::Error> {
let mut vocab_file = tempfile::NamedTempFile::new()?;
write!(vocab_file, "{{\"hello\": 1,\n \"world\": 0,\n \"<unk>\": 2,\n \"!\": 3\n, \"<pad>\": 4\n, \"<s>\": 5\n, \"</s>\": 6\n, \"<mask>\": 7\n}}")?;
let path = vocab_file.into_temp_path();
let roberta_vocab = RobertaVocab::from_file(path.to_path_buf().to_str().unwrap());
assert_eq!(roberta_vocab.token_to_id("hello"), 1);
assert_eq!(roberta_vocab.token_to_id("world"), 0);
assert_eq!(roberta_vocab.token_to_id("!"), 3);
assert_eq!(roberta_vocab.token_to_id("<unk>"), 2);
assert_eq!(roberta_vocab.token_to_id("<s>"), 5);
assert_eq!(roberta_vocab.token_to_id("</s>"), 6);
assert_eq!(roberta_vocab.token_to_id("<mask>"), 7);
assert_eq!(roberta_vocab.token_to_id("<pad>"), 4);
drop(path);
Ok(())
}
#[test]
fn test_decode_tokens() -> Result<(), io::Error> {
let mut vocab_file = tempfile::NamedTempFile::new()?;
write!(vocab_file, "{{\"hello\": 1,\n \"world\": 0,\n \"<unk>\": 2,\n \"!\": 3\n, \"<pad>\": 4\n, \"<s>\": 5\n, \"</s>\": 6\n, \"<mask>\": 7\n}}")?;
let path = vocab_file.into_temp_path();
let roberta_vocab = RobertaVocab::from_file(path.to_path_buf().to_str().unwrap());
assert_eq!(roberta_vocab.id_to_token(&(1 as i64)), "hello");
assert_eq!(roberta_vocab.id_to_token(&(0 as i64)), "world");
assert_eq!(roberta_vocab.id_to_token(&(3 as i64)), "!");
assert_eq!(roberta_vocab.id_to_token(&(2 as i64)), "<unk>");
assert_eq!(roberta_vocab.id_to_token(&(5 as i64)), "<s>");
assert_eq!(roberta_vocab.id_to_token(&(6 as i64)), "</s>");
assert_eq!(roberta_vocab.id_to_token(&(7 as i64)), "<mask>");
assert_eq!(roberta_vocab.id_to_token(&(4 as i64)), "<pad>");
drop(path);
Ok(())
}
}