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use serde::{Deserialize, Serialize};
extern crate tokenizers as tk;
use napi::bindgen_prelude::*;
use napi_derive::napi;
use std::sync::{Arc, RwLock};
use tk::decoders::DecoderWrapper;
/// Decoder
#[derive(Clone, Serialize, Deserialize)]
#[napi]
pub struct Decoder {
#[serde(flatten, with = "arc_rwlock_serde")]
decoder: Option<Arc<RwLock<DecoderWrapper>>>,
}
#[napi]
impl Decoder {
#[napi]
pub fn decode(&self, tokens: Vec<String>) -> Result<String> {
use tk::Decoder;
self
.decoder
.as_ref()
.unwrap()
.read()
.unwrap()
.decode(tokens)
.map_err(|e| Error::from_reason(format!("{}", e)))
}
}
impl tk::Decoder for Decoder {
fn decode_chain(&self, tokens: Vec<String>) -> tk::Result<Vec<String>> {
self
.decoder
.as_ref()
.ok_or("Uninitialized Decoder")?
.read()
.unwrap()
.decode_chain(tokens)
}
}
#[napi]
pub fn bpe_decoder(suffix: Option<String>) -> Decoder {
let suffix = suffix.unwrap_or("</w>".to_string());
let decoder = Some(Arc::new(RwLock::new(
tk::decoders::bpe::BPEDecoder::new(suffix).into(),
)));
Decoder { decoder }
}
#[napi]
pub fn byte_fallback_decoder() -> Decoder {
Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::decoders::byte_fallback::ByteFallback::new().into(),
))),
}
}
#[napi]
pub fn ctc_decoder(
#[napi(ts_arg_type = "string = '<pad>'")] pad_token: Option<String>,
word_delimiter_token: Option<String>,
cleanup: Option<bool>,
) -> Decoder {
let pad_token = pad_token.unwrap_or("<pad>".to_string());
let word_delimiter_token = word_delimiter_token.unwrap_or("|".to_string());
let cleanup = cleanup.unwrap_or(true);
let decoder = Some(Arc::new(RwLock::new(
tk::decoders::ctc::CTC::new(pad_token, word_delimiter_token, cleanup).into(),
)));
Decoder { decoder }
}
#[napi]
pub fn fuse_decoder() -> Decoder {
Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::decoders::fuse::Fuse::new().into(),
))),
}
}
#[napi]
pub fn metaspace_decoder(
#[napi(ts_arg_type = "string = '▁'")] replacement: Option<String>,
#[napi(ts_arg_type = "prepend_scheme = 'always'")] prepend_scheme: Option<String>,
#[napi(ts_arg_type = "split = true")] split: Option<bool>,
) -> Result<Decoder> {
use tk::pre_tokenizers::metaspace::PrependScheme;
let split = split.unwrap_or(true);
let replacement = replacement.unwrap_or("▁".to_string());
if replacement.chars().count() != 1 {
return Err(Error::from_reason(
"replacement is supposed to be a single char",
));
}
let replacement = replacement.chars().next().unwrap();
let prepend_scheme: PrependScheme =
match prepend_scheme.unwrap_or(String::from("always")).as_str() {
"always" => PrependScheme::Always,
"first" => PrependScheme::First,
"never" => PrependScheme::Never,
_ => {
return Err(Error::from_reason(
"prepend_scheme is supposed to be either 'always', 'first' or 'never'",
));
}
};
Ok(Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::decoders::metaspace::Metaspace::new(replacement, prepend_scheme, split).into(),
))),
})
}
#[napi]
pub fn replace_decoder(pattern: String, content: String) -> Result<Decoder> {
Ok(Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::normalizers::replace::Replace::new(pattern, content)
.map_err(|e| Error::from_reason(e.to_string()))?
.into(),
))),
})
}
#[napi]
pub fn sequence_decoder(decoders: Vec<&Decoder>) -> Decoder {
let sequence: Vec<tk::DecoderWrapper> = decoders
.into_iter()
.filter_map(|decoder| {
decoder
.decoder
.as_ref()
.map(|decoder| (**decoder).read().unwrap().clone())
})
.clone()
.collect();
Decoder {
decoder: Some(Arc::new(RwLock::new(tk::DecoderWrapper::Sequence(
tk::decoders::sequence::Sequence::new(sequence),
)))),
}
}
#[napi]
pub fn strip_decoder(content: String, left: u32, right: u32) -> Result<Decoder> {
let content: char = content.chars().next().ok_or(Error::from_reason(
"Expected non empty string for strip pattern",
))?;
Ok(Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::decoders::strip::Strip::new(content, left as usize, right as usize).into(),
))),
})
}
#[napi]
pub fn word_piece_decoder(
#[napi(ts_arg_type = "string = '##'")] prefix: Option<String>,
#[napi(ts_arg_type = "bool = true")] cleanup: Option<bool>,
) -> Decoder {
let prefix = prefix.unwrap_or("##".to_string());
let cleanup = cleanup.unwrap_or(true);
Decoder {
decoder: Some(Arc::new(RwLock::new(
tk::decoders::wordpiece::WordPiece::new(prefix, cleanup).into(),
))),
}
}
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