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// A simple C wrapper of tokenzier library
use serde_json::Value;
use std::{collections::HashMap, str::FromStr};
use tokenizers::models::bpe::BPE;
use tokenizers::pre_tokenizers::byte_level::ByteLevel;
use tokenizers::tokenizer::Tokenizer;
pub struct TokenizerWrapper {
tokenizer: Tokenizer,
encode_ids: Vec<u32>,
decode_str: String,
}
pub type Vocab = HashMap<String, u32>;
pub type Merges = Vec<(String, String)>;
impl TokenizerWrapper {
pub fn from_str(json: &str) -> TokenizerWrapper {
TokenizerWrapper {
tokenizer: Tokenizer::from_str(json).unwrap().into(),
encode_ids: Vec::new(),
decode_str: String::new(),
}
}
pub fn byte_level_bpe_from_str(
vocab: &str,
merges: &str,
added_tokens: &str,
) -> TokenizerWrapper {
let vocab_json: Value = serde_json::from_str(vocab).unwrap();
let added_tokens_json: Value = serde_json::from_str(added_tokens).unwrap();
let mut vocab = HashMap::new();
match vocab_json {
Value::Object(m) => {
for (token, id) in m {
if let Value::Number(id) = id {
let id = id.as_u64().unwrap() as u32;
vocab.insert(token, id);
}
}
}
_ => panic!("Invalid vocab.json file."),
};
match added_tokens_json {
Value::Object(m) => {
for (token, id) in m {
if let Value::Number(id) = id {
let id = id.as_u64().unwrap() as u32;
vocab.insert(token, id);
}
}
}
_ => panic!("Invalid added_tokens.json file."),
}
let merges = merges
.lines()
.filter(|line| !line.starts_with("#version"))
.map(|line| {
let parts = line.split(' ').collect::<Vec<_>>();
if parts.len() != 2 {
panic!("Invalid merges.txt file.")
}
return (parts[0].to_string(), parts[1].to_string()); // Add the `return` keyword here
})
.collect::<Vec<(String, String)>>();
let byte_level = ByteLevel::new(
/*add_prefix_space=*/ false, /*trim_offsets=*/ false,
/*use_regex=*/ false,
);
let mut tokenizer = Tokenizer::new(BPE::new(vocab, merges));
tokenizer
.with_pre_tokenizer(byte_level)
.with_decoder(byte_level);
TokenizerWrapper {
tokenizer: tokenizer,
encode_ids: Vec::new(),
decode_str: String::new(),
}
}
pub fn encode(&mut self, text: &str, add_special_tokens: bool) {
self.encode_ids = Vec::from(
self.tokenizer
.encode(text, add_special_tokens)
.unwrap()
.get_ids(),
);
}
pub fn decode(&mut self, ids: Vec<u32>, skip_special_tokens: bool) {
self.decode_str = self.tokenizer.decode(ids, skip_special_tokens).unwrap();
}
}
#[no_mangle]
extern "C" fn tokenizers_new_from_str(input_cstr: *const u8, len: usize) -> *mut TokenizerWrapper {
unsafe {
let json = std::str::from_utf8(std::slice::from_raw_parts(input_cstr, len)).unwrap();
return Box::into_raw(Box::new(TokenizerWrapper::from_str(json)));
}
}
#[no_mangle]
extern "C" fn byte_level_bpe_tokenizers_new_from_str(
input_vocab_str: *const u8,
len_vocab: usize,
input_merges_str: *const u8,
len_merges: usize,
input_added_tokens_str: *const u8,
len_added_tokens: usize,
) -> *mut TokenizerWrapper {
unsafe {
let vocab =
std::str::from_utf8(std::slice::from_raw_parts(input_vocab_str, len_vocab)).unwrap();
let merges =
std::str::from_utf8(std::slice::from_raw_parts(input_merges_str, len_merges)).unwrap();
let added_tokens = std::str::from_utf8(std::slice::from_raw_parts(
input_added_tokens_str,
len_added_tokens,
))
.unwrap();
return Box::into_raw(Box::new(TokenizerWrapper::byte_level_bpe_from_str(
vocab,
merges,
added_tokens,
)));
}
}
#[no_mangle]
extern "C" fn tokenizers_encode(
handle: *mut TokenizerWrapper,
input_cstr: *const u8,
len: usize,
add_special_tokens: i32,
) {
unsafe {
let input_data = std::str::from_utf8(std::slice::from_raw_parts(input_cstr, len)).unwrap();
(*handle).encode(input_data, add_special_tokens != 0);
}
}
#[no_mangle]
extern "C" fn tokenizers_get_encode_ids(
handle: *mut TokenizerWrapper,
out_data: *mut *mut u32,
out_len: *mut usize,
) {
unsafe {
*out_data = (*handle).encode_ids.as_mut_ptr();
*out_len = (*handle).encode_ids.len()
}
}
#[no_mangle]
extern "C" fn tokenizers_decode(
handle: *mut TokenizerWrapper,
input_ids: *const u32,
len: usize,
skip_special_tokens: i32,
) {
unsafe {
let input_data = Vec::from(std::slice::from_raw_parts(input_ids, len));
(*handle).decode(input_data, skip_special_tokens != 0);
}
}
#[no_mangle]
extern "C" fn tokenizers_get_decode_str(
handle: *mut TokenizerWrapper,
out_cstr: *mut *mut u8,
out_len: *mut usize,
) {
unsafe {
*out_cstr = (*handle).decode_str.as_mut_ptr();
*out_len = (*handle).decode_str.len();
}
}
#[no_mangle]
extern "C" fn tokenizers_free(wrapper: *mut TokenizerWrapper) {
unsafe {
drop(Box::from_raw(wrapper));
}
}
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