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import os
import pathlib
import rwkv_world_tokenizer
from typing import List, Tuple, Callable
def add_tokenizer_argument(parser) -> None:
parser.add_argument(
'tokenizer',
help='Tokenizer to use; supported tokenizers: auto (guess from n_vocab), 20B, world',
nargs='?',
type=str,
default='auto'
)
def get_tokenizer(tokenizer_name: str, n_vocab: int) -> Tuple[
Callable[[List[int]], str],
Callable[[str], List[int]]
]:
if tokenizer_name == 'auto':
if n_vocab == 50277:
tokenizer_name = '20B'
elif n_vocab == 65536:
tokenizer_name = 'world'
else:
raise ValueError(f'Can not guess the tokenizer from n_vocab value of {n_vocab}')
parent: pathlib.Path = pathlib.Path(os.path.abspath(__file__)).parent
if tokenizer_name == 'world':
print('Loading World v20230424 tokenizer')
return rwkv_world_tokenizer.get_world_tokenizer_v20230424()
elif tokenizer_name == '20B':
print('Loading 20B tokenizer')
import tokenizers
tokenizer: tokenizers.Tokenizer = tokenizers.Tokenizer.from_file(str(parent / '20B_tokenizer.json'))
return tokenizer.decode, lambda x: tokenizer.encode(x).ids
else:
raise ValueError(f'Unknown tokenizer {tokenizer_name}')
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