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Add support for the world tokenizer (#86)
* Add support for the world tokenizer * Move tokenizer logic to rwkv_tokenizer.py * Added test for the tokenizer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| import os | ||
| import tokenizers | ||
| import pathlib | ||
|
|
||
| ######################################################################################################## | ||
| # Taken from https://github.com/BlinkDL/ChatRWKV/tree/main/tokenizer/rwkv_tokenizer.py | ||
| ######################################################################################################## | ||
|
|
||
| class TRIE: | ||
| __slots__ = tuple("ch,to,values,front".split(",")) | ||
| to:list | ||
| values:set | ||
| def __init__(self, front=None, ch=None): | ||
| self.ch = ch | ||
| self.to = [None for ch in range(256)] | ||
| self.values = set() | ||
| self.front = front | ||
|
|
||
| def __repr__(self): | ||
| fr = self | ||
| ret = [] | ||
| while(fr!=None): | ||
| if(fr.ch!=None): | ||
| ret.append(fr.ch) | ||
| fr = fr.front | ||
| return "<TRIE %s %s>"%(ret[::-1], self.values) | ||
|
|
||
| def add(self, key:bytes, idx:int=0, val=None): | ||
| 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): | ||
| u:TRIE = self | ||
| ch:int = key[idx] | ||
|
|
||
| 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] | ||
| return ret | ||
|
|
||
| class TRIE_TOKENIZER(): | ||
| def __init__(self, file_name): | ||
| self.idx2token = {} | ||
| sorted = [] # must be already sorted | ||
| with open(file_name, "r", encoding="utf-8") as f: | ||
| lines = f.readlines() | ||
| for l in lines: | ||
| idx = int(l[:l.index(' ')]) | ||
| x = eval(l[l.index(' '):l.rindex(' ')]) | ||
| x = x.encode("utf-8") if isinstance(x, str) else x | ||
| assert isinstance(x, bytes) | ||
| assert len(x) == int(l[l.rindex(' '):]) | ||
| sorted += [x] | ||
| self.idx2token[idx] = x | ||
|
|
||
| self.token2idx = {} | ||
| for k,v in self.idx2token.items(): | ||
| self.token2idx[v] = int(k) | ||
|
|
||
| self.root = TRIE() | ||
| for t, i in self.token2idx.items(): | ||
| _ = self.root.add(t, val=(t, i)) | ||
|
|
||
| def encodeBytes(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 decodeBytes(self, tokens): | ||
| return b''.join(map(lambda i: self.idx2token[i], tokens)) | ||
|
|
||
| def encode(self, src): | ||
| return self.encodeBytes(src.encode("utf-8")) | ||
|
|
||
| def decode(self, tokens): | ||
| return self.decodeBytes(tokens).decode('utf-8') | ||
|
|
||
| def printTokens(self, tokens): | ||
| for i in tokens: | ||
| s = self.idx2token[i] | ||
| try: | ||
| s = s.decode('utf-8') | ||
| except: | ||
| pass | ||
| print(f'{repr(s)}{i}', end=' ') | ||
| print() | ||
|
|
||
| def get_tokenizer(tokenizer="20B"): | ||
| if tokenizer == "world": | ||
| print('Loading world tokenizer') | ||
| tokenizer = TRIE_TOKENIZER('rwkv_vocab_v20230424.txt') | ||
| tokenizer_encode = lambda prompt: tokenizer.encode(prompt) | ||
| elif tokenizer == "20B": | ||
| print('Loading 20B tokenizer') | ||
| tokenizer_path: pathlib.Path = pathlib.Path(os.path.abspath(__file__)).parent / '20B_tokenizer.json' | ||
| tokenizer: tokenizers.Tokenizer = tokenizers.Tokenizer.from_file(str(tokenizer_path)) | ||
| tokenizer_encode = lambda prompt: tokenizer.encode(prompt).ids | ||
| else: | ||
| print(f"Unknown tokenizer: {args.tokenizer}") | ||
| quit() | ||
| return tokenizer, tokenizer_encode |
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