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tiktoken_py.rs
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tiktoken_py.rs
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// This check is new and seems buggy (possibly with PyO3 interaction)
#![allow(clippy::borrow_deref_ref)]
use std::collections::HashSet;
use pyo3::exceptions;
use pyo3::prelude::*;
use pyo3::PyResult;
use pyo3::types::{PyBytes, PyList, PyTuple};
use rustc_hash::FxHashMap as HashMap;
use tiktoken::core::{byte_pair_encode, CoreBPE};
#[pyclass]
pub struct PyCoreBPE {
pub core_bpe: CoreBPE,
}
#[pymethods]
impl PyCoreBPE {
#[new]
fn new(
encoder: HashMap<Vec<u8>, usize>,
special_tokens_encoder: HashMap<String, usize>,
pattern: &str,
) -> PyResult<Self> {
println!("encoder: {:?}", encoder);
CoreBPE::new(encoder, special_tokens_encoder, pattern)
.map(|core_bpe| PyCoreBPE { core_bpe })
.map_err(|e| PyErr::new::<exceptions::PyValueError, _>(e.to_string()))
}
// ====================
// Encoding
// ====================
fn encode_ordinary(&self, py: Python, text: &str) -> Vec<usize> {
py.allow_threads(|| self.core_bpe._encode_ordinary_native(text))
}
fn encode(&self, py: Python, text: &str, allowed_special: HashSet<&str>) -> Vec<usize> {
py.allow_threads(|| self.core_bpe._encode_native(text, &allowed_special).0)
}
fn _encode_bytes(&self, py: Python, bytes: &[u8]) -> Vec<usize> {
py.allow_threads(|| self.core_bpe._encode_bytes(bytes))
}
fn encode_with_unstable(
&self,
py: Python,
text: &str,
allowed_special: HashSet<&str>,
) -> Py<PyTuple> {
let (tokens, completions) =
py.allow_threads(|| self.core_bpe._encode_unstable_native(text, &allowed_special));
let py_completions =
PyList::new(py, completions.iter().map(|seq| PyList::new(py, &seq[..])));
(tokens, py_completions).into_py(py)
}
fn encode_single_token(&self, piece: &[u8]) -> PyResult<usize> {
if let Some(token) = self.core_bpe.encoder.get(piece).copied() {
return Ok(token);
}
if let Ok(piece_str) = std::str::from_utf8(piece) {
if let Some(token) = self.core_bpe.special_tokens_encoder.get(piece_str).copied() {
return Ok(token);
}
}
Err(PyErr::new::<exceptions::PyKeyError, _>(piece.to_owned()))
}
fn encode_single_piece(&self, piece: &[u8]) -> Vec<usize> {
if let Some(token) = self.core_bpe.encoder.get(piece) {
return vec![*token];
}
byte_pair_encode(piece, &self.core_bpe.encoder)
}
// ====================
// Decoding
// ====================
fn decode_bytes(&self, py: Python, tokens: Vec<usize>) -> Py<PyBytes> {
let bytes = py.allow_threads(|| self.core_bpe._decode_native(&tokens));
PyBytes::new(py, &bytes).into()
}
fn decode_single_token_bytes(&self, py: Python, token: usize) -> PyResult<Py<PyBytes>> {
if let Some(bytes) = self.core_bpe.decoder.get(&token) {
return Ok(PyBytes::new(py, bytes).into());
}
if let Some(bytes) = self.core_bpe.special_tokens_decoder.get(&token) {
return Ok(PyBytes::new(py, bytes).into());
}
Err(PyErr::new::<exceptions::PyKeyError, _>(token.to_string()))
}
// ====================
// Miscellaneous
// ====================
fn token_byte_values(&self, py: Python) -> Vec<Py<PyBytes>> {
self.core_bpe.sorted_token_bytes
.iter()
.map(|x| PyBytes::new(py, x).into())
.collect()
}
}
#[pymodule]
pub fn _tiktoken(_py: Python, m: &PyModule) -> PyResult<()> {
m.add_class::<PyCoreBPE>()?;
Ok(())
}
#[cfg(test)]
mod tests {
use rustc_hash::FxHashMap as HashMap;
use tiktoken::core::byte_pair_split;
#[test]
fn very_simple_test() {
let mut ranks = HashMap::default();
ranks.insert(b"ab".to_vec(), 1);
ranks.insert(b"cd".to_vec(), 2);
let res = byte_pair_split(b"abcd", &ranks);
assert_eq!(res, vec![b"ab", b"cd"]);
}
}