# Copyright 2022 Cerebras Systems.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from tokenizers import Tokenizer
[docs]class HFTokenizer:
"""Designed to integrate the HF's Tokenizer library
Args:
vocab_file (str): A vocabulary file to create the tokenizer from.
special_tokens (list, str): A list or a string representing the special
tokens that are to be added to the tokenizer.
"""
[docs] def __init__(self, vocab_file, special_tokens=None):
self.tokenizer = Tokenizer.from_file(vocab_file)
if special_tokens:
self.add_special_tokens(special_tokens)
self.set_eos_pad_tokens()
def set_eos_pad_tokens(self):
self.eos_id = self.get_token_id("<|endoftext|>")
self.pad_id = self.get_token_id("<|padding|>")
def encode(self, text):
return self.tokenizer.encode(text).ids
def decode(self, token_ids):
return self.tokenizer.decode(token_ids)
def add_special_tokens(self, special_tokens):
self.tokenizer.add_special_tokens(special_tokens)
def add_token(self, token):
self.tokenizer.add_tokens(token)
def get_token_id(self, token):
return self.tokenizer.token_to_id(token)
def get_token(self, id):
return self.tokenizer.id_to_token(id)
@property
def eos(self):
return self.eos_id
@property
def pad(self):
return self.pad_id