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rwkv_world_tokenizer.py
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rwkv_world_tokenizer.py
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import os
import pathlib
from typing import List, Set, Tuple, Callable
# Taken from https://github.com/BlinkDL/ChatRWKV/tree/main/tokenizer/rwkv_tokenizer.py
class Trie:
__slots__ = ('ch', 'to', 'values', 'front')
def __init__(self, front=None, ch=None) -> None:
self.ch = ch
self.to: List = [None for _ in range(256)]
self.values: Set = set()
self.front = front
def add(self, key: bytes, idx: int = 0, val=None) -> 'Trie':
if idx == len(key):
if val is None:
val = key
self.values.add(val)
return self
ch = key[idx]
if self.to[ch] is None:
self.to[ch] = Trie(front=self, ch=ch)
return self.to[ch].add(key, idx=idx + 1, val=val)
def find_longest(self, key: bytes, idx: int = 0) -> Tuple[int, 'Trie', set]:
u: Trie = self
ch: int = key[idx]
ret = None
while u.to[ch] is not None:
u = u.to[ch]
idx += 1
if u.values:
ret = idx, u, u.values
if idx == len(key):
break
ch = key[idx]
if ret is None:
raise ValueError('Entry not found')
return ret
def __repr__(self) -> str:
fr = self
ret = []
while fr is not None:
if fr.ch is not None:
ret.append(fr.ch)
fr = fr.front
return '<TRIE %s %s>' % (ret[::-1], self.values)
class WorldTokenizer:
def __init__(self, file_path) -> None:
self.index_to_token = {}
with open(file_path, 'r', encoding='utf-8') as f:
lines = f.readlines()
for line in lines:
idx = int(line[:line.index(' ')])
x = eval(line[line.index(' '):line.rindex(' ')])
x = x.encode('utf-8') if isinstance(x, str) else x
assert isinstance(x, bytes)
assert len(x) == int(line[line.rindex(' '):])
self.index_to_token[idx] = x
self.token_to_index = {}
for k, v in self.index_to_token.items():
self.token_to_index[v] = int(k)
self.root = Trie()
for t, i in self.token_to_index.items():
_ = self.root.add(t, val=(t, i))
def encode_bytes(self, src: bytes) -> List[int]:
idx: int = 0
tokens: List[int] = []
while idx < len(src):
_idx: int = idx
idx, _, values = self.root.find_longest(src, idx)
assert (idx != _idx)
_, token = next(iter(values))
tokens.append(token)
return tokens
def decode_bytes(self, tokens: List[int]) -> bytes:
return b''.join(map(lambda i: self.index_to_token[i], tokens))
def encode(self, src: str) -> List[int]:
return self.encode_bytes(src.encode('utf-8'))
def decode(self, tokens: List[int]) -> str:
# 'replace' error handling mode will insert \uFFFD characters in place of malformed/partial UTF-8 sequences.
# Downstream code needs to detect \uFFFD and attempt to postpone decoding until more tokens arrive and UTF-8 sequences are complete.
return self.decode_bytes(tokens).decode('utf-8', errors='replace')
def get_world_tokenizer_v20230424() -> Tuple[
Callable[[List[int]], str],
Callable[[str], List[int]]
]:
"""
Loads the default World tokenizer, commonly used in RWKV v4 World models.
Returns a tuple of `decode` and `encode` functions.
"""
parent: pathlib.Path = pathlib.Path(os.path.abspath(__file__)).parent
tokenizer: WorldTokenizer = WorldTokenizer(parent / 'rwkv_vocab_v20230424.txt')
return tokenizer.decode, tokenizer.encode