# Bert Tokenization

GPT, BERT and XLNet ﬁll the gap by strengthening the contextual sentence modeling for better representa-tion, among which BERT uses a different pre-training objective, masked language model, which allows cap-turing both sides of context, left and right. In WordPiece, we split the tokens like playing to play and ##ing. bert-pretrained-example. com Abstract Multilingual transfer learning can beneﬁt both high- and low-resource languages, but the. Sci Bert Huggingface. This progress has left the research lab and started powering some of the leading digital products. √ tokenization. Implemented in one code library. The tokenization must be performed by the tokenizer included with BERT-the below cell will download this for us. In order to deal with the words not available in the vocabulary, BERT uses a technique called BPE based WordPiece tokenization. 5 m o d e l ⋅ min ( s t e p − 0. Official pre-trained models could be loaded for feature extraction and prediction. Bert Strassburg gefällt das. 0 5 votes def _is_whitespace(char): """Checks whether chars is a whitespace character. [SEP] He bought a gallon of milk. In WordPiece, we split the tokens like playing to play and ##ing. Adding BERT-like tokenization model is describing how to add new tokenization model similar to BERT. Designed and implemented a biLSTM-CRF model that performs joint tokenization, sentence boundary detection and Part-of-Speech tagging. BERT Masked Language Model (출처: rani horev's blog : BERT explained) 그림 3에서 볼 수 있듯, 일단 단어 중의 일부를 [MASK] token 으로 바꾸어 줍니다. In Python tokenization basically refers to splitting up a larger body of text into smaller lines, words or even creating words for a non-English language. Tags: AI , BERT , Chatbot , NLP A 2019 Guide to Speech Synthesis with Deep Learning - Sep 9, 2019. For all training methods of all Transformer models, the learning rate schedule is set to l r = η ⋅ d − 0. Huggingface’s GPT2 [5] and RoBERTa [6] implementations use the same vocabulary with 50000 word pieces. txt # 字符编码 之后的各种NLP任务都可以用这个模型。. These words are called stop words. Dataframe格式3、完成数据预处理。这部分应完成：1）…. This repo contains a TensorFlow 2. Each annotation converter expects specific annotation file format or data structure, which depends on original dataset. For the vast majority of languages, the only option is the multilingual BERT model trained jointly on 104 languages. They are then passed to the DistilBERT neural net to produce 'embeddings'. 在pytorch-pretrained-BERT/pytorch_pretrained_bert/tokenization. encode ([ 'hey you' , 'whats up?' , '你好么？' , '我 还 可以' ]) tokens: [CLS] hey you [SEP] input_ids: 101 13153 8357 102 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 input_mask: 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tokens: [CLS. It is set to 128. The TextCategorizer component expects true examples of a label to have the value 1. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. BERT is designed to pre- train deep bidirectional representations from unlabeled text by jointly conditioning on both left and right context in all layers. meta └── vocab. These span BERT Base and BERT Large, as well as languages such as English, Chinese, and a multi-lingual model covering 102 languages trained on wikipedia. import tensorflow as tf import pandas as pd import tensorflow_hub as hub import os import re import numpy as np from bert. Tokenization is achieved with SentencePiece. Prior to this the most high profile incumbent was Word2Vec which was first published in 2013. Hugging Face is an NLP-focused startup with a large open-source community, in particular around the Transformers library. uncased_L-12_H-768_A-12. ModuleNotFoundError: No module named 'tokenization' RAW Paste Data import bert from bert import run_classifier ImportError: cannot import name 'run_classifier' Help on module bert. In this post we compare the performance of our German model against the multilingual. com Abstract. Includes use of bert library for tokenization and preprocessing. Before we process the entire dataset using this tokenizer, there are a few conditions that we need to satisfy in order to setup the training data for BERT: Add special tokens at the start and end of each sentence. For instance, the official repo , does not contain any code for learning a new WordPiece vocab. BERT models are available on Tensorflow Hub (TF-Hub). 0 akensert Kernel Author • Posted on Version 9 of 12 • 4 months ago • Reply 0. 1 Pretraining Data To provide a sufﬁciently large and varied unanno-. , 2016), from which we extract word-aligned representations by only. txt # 字符编码 之后的各种NLP任务都可以用这个模型。. 1、下载/制备数据集，这一步自行解决。2 、用bert. Dive Into NLTK, Part II: Sentence Tokenize and Word Tokenize Posted on April 15, 2014 by TextMiner March 26, 2017 This is the second article in the series " Dive Into NLTK ", here is an index of all the articles in the series that have been published to date:. The tokenizer available with the BERT package is very powerful. x run_pretraining (see you next part) 1、分词（tokenization. BERT に関する基本的な説明が結構長いので、BERT を理解している人は SentencePiece による tokenization の置き換え の節まで飛ばしてください。 BERT とはどのようなモデルか. The latest version of Uber's Ludwig -- Ludwig 0. BERT is conceptually simple and empirically powerful. Prior to connecting the BERT-based answer veriﬁer with the BiDAF-based answer. """ # \t, \n, and \r are technically contorl characters but we treat them # as whitespace since they are generally considered as such. このページでは、日本語Wikipediaを対象に情報通信研究機構 データ駆動知能システム研究センターで事前学習を行ったBERTモデルをクリエイティブ・コモンズ 表示 4. index ├── bert_model. 1 Pretraining Data To provide a sufﬁciently large and varied unanno-. )( 3 C Te TC a C RTs Ci C C ü t t p s a s g C • (/ 2) / H N Cs L • s C C N • Nv • ( - N •. you will hear alot about BERT in 2019. " You now have a list of WordPieces which is much longer than, and misaligned with, your list of labels. Choosing a natural language processing technology in Azure. tokenization import FullTokenizer from tqdm. The same architecture hyperparameters as BERT-Large are used in XLNet-Large and trained on 512 TPU v3 chips for 500K epochs with an Adam optimizer. This way, the BERT will be trained jointly with the Linear layer. Next we feed the tokenizer with each sentence in our datsaset. Includes use of bert library for tokenization and preprocessing. There is a wide range of packages available in R for natural language processing and text mining. 0 and generate predictions. Tokenization. Recently a new language representation model, BERT (Bidirectional Encoder Representations from Transformers), facilitates pre-training deep bidirectional. BERT ***** New March 11th, 2020: Smaller BERT Models ***** This is a release of 24 smaller BERT models (English only, uncased, trained with WordPiece masking) referenced in Well-Read Students Learn Better: On the Importance of Pre-training Compact Models. To feed our text to BERT, it must be split into tokens, and then these tokens must be mapped to their index in the tokenizer vocabulary. Word embedding is the collective name for a set of language modeling and feature learning techniques in natural language processing (NLP) where words or phrases from the vocabulary are mapped to vectors of real numbers. Are there any instances where original. 目前有两种多语言模型可供选择。我们不打算发布更多单语言模型，但可能会在未来发布这两种模型的BERT-Large版本： BERT-Base, Multilingual: 102 languages, 12-layer, 768-hidden, 12-heads, 110M parameters. Jinhyuk Lee, created this real-time Q&A search engine in response to this challenge and further in an effort to provide assistance to people fighting the disease http. If tags are provided, calculates tags for subtokens. It is a new pre-training language representation model which obtains state-of-the-art results on various Natural Language Processing (NLP) tasks. BERT模型是谷歌提出的基于双向Transformer构建的语言模型。BERT模型和ELMo有大不同，在之前的预训练模型（包括word2vec，ELMo等）都会生成词向量，这种类别的预训练模型属于domain transfer。而近一两年提出的ULMFiT，GPT，BERT等都属于模型迁移。. Many of you may have already heard, but Kaggle recently announced their COVID-19 Open Research Dataset Challenge (CORD-19) backed by Allen Institute for AI and co. 6: Coreference Resolution with Entity Equalization: Official: Fei et al. どうも、大阪DI部の大澤です。 汎用言語表現モデルBERTの日本語Wikipediaで事前学習済みのモデルがあったので、BERTモデルを使ったテキストの埋め込みをやってみたいと思います。. 2019 - ALBERT tokenization added (make sure to import as from bert import albert_tokenization or from bert import bert_tokenization). BERT (Bidirectional Encoder Representations from Transformers), released in late 2018, is the model we will use in this tutorial to provide readers with a better understanding of and practical guidance for using transfer learning models in NLP. py tokenization_test. Natural language toolkit (NLTK) is the most popular library for natural language processing (NLP) which was written in Python and has a big community behind it. We'll be using the "uncased" version here. Tokenization Given a character sequence and a defined document unit, tokenization is the task of chopping it up into pieces, called tokens, perhaps at the same time throwing away certain characters, such as punctuation. ├── bert_config. bert / tokenization. We present an end-to-end approach for knowledge-grounded response generation in Dialog System Technology Challenges 7 (DSTC7). We also created a tokenizer. , "James Bond" becomes "james bond". Bert系列（四）——源码解读之Fine-tune. Figure 1: BERT. edu fbmccann,cxiong,[email protected] BERT is changing the NLP landscape and making chatbots much smarter by enabling computers to better understand speech and respond intelligently in real-time. As far as I understand, BERT is a word embedding that can be fine-tuned or used directly. These words are called stop words. The model is based on the Transformer architecture introduced in Attention Is All You Need by Ashish Vaswani et al and has led to significant improvements on a wide range of downstream tasks. Let's define fertility , borrowed from statistical machine translation, as the average number of BERT word pieces corresponding with a single real token. It combines many of the trends we already mentioned, the transformer architecture, pre-trained models and fine tuning. Chinese word segmentation (CWS) is a fundamental task for Chinese language understanding. Explicitly, the length of a WordPiece tokenization of the document - with respect to the BERT pre-training vocabulary - exceeds $\ell - 2 = 510$ tokens. BERT for Coreference Resolution: Baselines and Analysis: Official: Kantor and Globerson (2019) 76. Uncased means that the text is converted to lowercase before performing Workpiece tokenization, e. Rather, it looks at WordPieces. √ tokenization. Conclusion. Results with BERT To evaluate performance, we compared BERT to other state-of-the-art NLP systems. ModuleNotFoundError: No module named 'tokenization' RAW Paste Data import bert from bert import run_classifier ImportError: cannot import name 'run_classifier' Help on module bert. After tokenization, the prediction can be made using the pre-trained BERT network. bert_config = modeling. To mitigate this, similar to current neural machine translation models and pretrained language models like BERT and GPT-2, we employ SentencePiece subword tokenization, which has since been incorporated into the fast. They often suffer from small-scale human-labeled training data, resulting in poor generalization capability, especially for rare words. BERT models allow data scientists to stand on the shoulders of giants. data-00000-of-00001 # 预训练模型 ├── bert_model. In this post we introduce our new wrapping library, spacy-transformers. To mitigate this, similar to current neural machine translation models and pretrained language models like BERT and GPT-2, we employ SentencePiece subword tokenization, which has since been incorporated into the fast. BERT models are available on Tensorflow Hub (TF-Hub). 5 days of training. Contributing. 13 with the following results: As you can see Bling Fire is much faster than existing tokenizers for BERT based models. sentence, and utilize BERT self-attention matrices at each layer and head and choose the entity that is attended to most by the pronoun. A non-factoid question answering (QA) is an umbrella term that covers all question-answering topics beyond factoid question answering. 0, you need to specify the parameter version_2 and specify the parameter null_score_diff_threshold. Tokenization is achieved with SentencePiece. Examining the output of BERT tokenizer confirmed that the tokenizer keeps English mostly intact while it may generate different token distributions in morphologically rich languages. Users should refer to the superclass for more information regarding methods. I have seen that NLP models such as BERT utilize WordPiece for tokenization. Implementation of the BERT. align helper returns a (cost, a2b, b2a, a2b_multi, b2a_multi) tuple describing the number of misaligned tokens. It handles tasks such as named entity recognition, part of speech tagging, and question-answering among other natural language processes. How to freeze all layers of Bert and just train task-based layers during the fine-tuning process? We can do it by setting the requires_grad=false for all layers In pytorch-pretrained-BERT. We use the corresponding pre-trained byte-pair-encoding (Sennrich et al. py / Jump to Code definitions TokenizationTest Class test_full_tokenizer Function test_chinese Function test_basic_tokenizer_lower Function test_basic_tokenizer_no_lower Function test_wordpiece_tokenizer Function test_convert_tokens_to_ids Function test_is_whitespace Function test_is_control Function test_is_punctuation. Browse our catalogue of tasks and access state-of-the-art solutions. Parameters needed for training. After all, the words are still the basic tokens. bert / tokenization. If we skip this step then there is a higher chance that you are working with noisy and inconsistent data. The pre-trained BERT model can be fine-tuned by just adding a single output layer. json' checkpoint_path = folder+. The word tokenization tokenized with the model bert-base-cased: [‘token’, ‘##ization’] GPT2, RoBERTa. The use of WordPiece tokenization enables BERT to only store 30,522 “words” in its vocabulary and very rarely encounter out-of-vocab words in the wild when tokenizing English texts. According to their paper, It obtains new state-of-the-art results on wide range of natural language processing tasks like text classification, entity recognition. I tokenized each treebank with BertTokenizer and compared the tokenization with the gold standard tokenization. Jinhyuk Lee, created this real-time Q&A search engine in response to this challenge and further in an effort to provide assistance to people fighting the disease http. models import Model. For all training methods of all Transformer models, the learning rate schedule is set to l r = η ⋅ d − 0. To account for the differences in the size of Wikipedia, some. Using the BERT vocabulary. Only has an effect when do_wordpiece_only=False do_basic_tokenize: Whether to do basic tokenization before wordpiece. 2019 - ALBERT tokenization added (make sure to import as from bert import albert_tokenization or from bert import bert_tokenization). 0 bert or ask your own question. Browse our catalogue of tasks and access state-of-the-art solutions. Then for NER, how to find the corresponding class label for the word broken into several tokens? for example, if 'London' was broken into '##lon" and "##don", shall we give the same label "location" to both "##lon" and "##don"?. Predicting Movie Review Sentiment with BERT on TF Hub - shows how to use a BERT module for classification. 5 , s t e p ⋅ w a r m u p _ s t e p s − 1. BERT に関する基本的な説明が結構長いので、BERT を理解している人は SentencePiece による tokenization の置き換え の節まで飛ばしてください。 BERT とはどのようなモデルか. It means that a word can be broken down into more than one sub-words. This class will process texts by applying them the pre_rules, tokenizing them with tok_func(lang) and then applying the post_rules. For the vast majority of languages, the only option is the multilingual BERT model trained jointly on 104 languages. As with any fundamentals course, Introduction to Natural Language Processing in R is designed to equip you with the necessary tools to begin your adventures in analyzing text. As a quick reminder: a factoid QA is about providing concise facts. Bert tokenization is Based on WordPiece. The Overflow Blog Build your technical skills at home with online learning. √ create_pretraining_data. 2018 was a busy year for deep learning based Natural Language Processing (NLP) research. BERT (Bidirectional Encoder Representations from Transformers), released in late 2018, is the model we will use in this tutorial to provide readers with a better understanding of and practical guidance for using transfer learning models in NLP. Conclusion. Model: "model_6" _____ Layer (type) Output Shape Param # Connected to ===== input_ids (InputLayer) [(None, 256)] 0 _____ input_masks (InputLayer) [(None, 256)] 0. NICT BERT 日本語 Pre-trained モデル 概要. Alternatively, finetuning BERT can provide both an accuracy boost and faster training time in many cases. bert / tokenization. You could instantiate it like this: from bert4tf import BertModelLayer l_bert = BertModelLayer (** BertModelLayer. Bert tokenization is Based on WordPiece. At the end of every sentence, we need to append the special [SEP] token. BERT (Bidirectional Encoder Representations from Transformers), released in late 2018, is the model we will use in this tutorial to provide readers with a better understanding of and practical guidance for using transfer learning models in NLP. Google open sources pre-trained BERT models, along with TensorFlow code that does this pre-training. In order to deal with the words not available in the vocabulary, BERT uses a technique called BPE based WordPiece tokenization. Description. BERT に関する基本的な説明が結構長いので、BERT を理解している人は SentencePiece による tokenization の置き換え の節まで飛ばしてください。 BERT とはどのようなモデルか. 9 kB | linux-64/pytorch-pretrained-bert-. Bert tokenization is Based on WordPiece. The XLNet paper goes over this point pretty thoroughly. Dataframe格式3、完成数据预处理。这部分应完成：1）…. (Note that this only applies for Colab. It's much faster than the full BERT model without sacrificing much in the way of performance. BERT Tokenizer. Huggingface’s GPT2 [5] and RoBERTa [6] implementations use the same vocabulary with 50000 word pieces. BERT uses WordPiece tokenization. ai text package. The world of subword tokenization is, like the deep learning NLP universe, evolving rapidly in a short space of time. While vocabulary size is below the target size: 1. BERT asso-ciates vectors to sub-word units based on Word-Piece tokenization (Wu et al. 04805] です。BERTとは Bidrectional Encoder Representations from Transformers の略で、その名の通り、双方向性とTransformerを特徴とします。. py是对原始文本语料的处理，分为BasicTokenizer和WordpieceTokenizer两类。 BasicTokenizer. The model is publicly available in different versions: TF version as zip archive, PyTorch version through transformers. do_lower_case for Bert). Did you find this Notebook useful?. tokenization' I tried to install bert by running the following command:!pip install --upgrade bert Any idea how to resolve this error?. Project: BERT Author: yyht File: tokenization. Learn SentencePiece vocabulary. We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising. Description. Let's see what each of the features looks like: In the above output, we have an original sentence from the training set. At the end of every sentence, we need to append the special [SEP] token. PyTorch pretrained bert can be installed by pip as follows: pip install pytorch-pretrained-bert If you want to reproduce the original tokenization process of the OpenAI GPT paper, you will need to install ftfy (limit to version 4. Project: bert-sts Author: swen128 File: tokenization. How and to what extent does BERT encode syntactically-sensitive hierarchical information or positionally-sensitive linear information? Recent work has shown that contextual representations like BERT perform well on tasks that require sensitivity to linguistic structure. At the end of every sentence, we need to append the special [SEP] token. If you want more details about the model and the pre-training, you find some resources at the end of this post. Conclusion. ckpt：负责模型变量载入. Hi Guys, I have sentences, and I want to perform sentence tokenization and then word My impression is that its weights are better than Bert. py: Help on module bert. We present here two studies which aim to provide a better understanding of the nature of BERT's representations. return bert. Tokenization. However, another problem occurred. Submitted by Galitskiy Igor a year ago. Named-entity recognition (NER) (also known as entity identification, entity chunking and entity extraction) is a subtask of information extraction that seeks to locate and classify named entity mentioned in unstructured text into pre-defined categories such as person names, organizations, locations, medical codes, time expressions, quantities, monetary values, percentages, etc. In order to use BERT text embeddings as input to train text classification model, we need to tokenize our text reviews. It's much faster than the full BERT model without sacrificing much in the way of performance. ” Bert vs Rank Brain. BERT-Base, Multilingual: 102 languages, 12-layer, 768-hidden, 12-heads, 110M parameters. # coding: utf-8 import sys import codecs import numpy as np from keras_bert import load_trained_model_from_checkpoint import tokenization # папка, куда распаковали преодобученную нейросеть BERT folder = 'multi_cased_L-12_H-768_A-12' config_path = folder+'/bert_config. According to their paper, It obtains new state-of-the-art results on wide range of natural language processing tasks like text classification, entity recognition. We also support arbitrary models with normalization and sub-token extraction like in BERT tokenizer. encode ([ 'hey you' , 'whats up?' , '你好么？' , '我 还 可以' ]) tokens: [CLS] hey you [SEP] input_ids: 101 13153 8357 102 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 input_mask: 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tokens: [CLS. It is mentioned that it covers a wider spectrum of Out-Of-Vocabulary (OOV) words. Next we feed the tokenizer with each sentence in our datsaset. W hat a year for natural language processing! We’ve seen great improvement in terms of accuracy and learning speed, and more importantly, large networks are now more accessible thanks to Hugging Face and their wonderful Transformers library, which provides a high-level API to work with BERT, GPT, and many more language model variants. Our results indicate that the next sentence prediction objective actually hurts the performance of the model while identifying the language in the input does not affect B-BERT's performance cross-lingually. BERT is Not an Interlingua and the Bias of Tokenization Jasdeep Singh1, Bryan McCann2, Caiming Xiong2, Richard Socher2 Stanford University1, Salesforce Research2 [email protected] The subword tokenization employed by BERT provides a stronger bias towards such structure than character- and word-level tokenizations. Natural language processing (NLP) is used for tasks such as sentiment analysis, topic detection, language detection, key phrase extraction, and document categorization. This video shows: - Popular BERT implementation - Creating Custom Datasets and using it in DataLoader - Tokenization using BERT tokenizer - Using pad_sequence to make it of the same length. Leveraging BERT for Extractive Text Summarization on Lectures Derek Miller Georgia Institute of Technology Atlanta, Georgia [email protected] encode (texts2, is_tokenized = True). Implemented in one code library. , 2018)+coarse-to-fine & second-order inference (Lee et. allennlp / packages / pytorch-pretrained-bert 0. # Params for bert model and tokenization Nsamp = 1000 # number of samples to generate in each class - 'spam', 'not spam' maxtokens = 200 # the maximum number of tokens per document maxtokenlen = 100 # the maximum length of each token. # coding: utf-8 import sys import codecs import numpy as np from keras_bert import load_trained_model_from_checkpoint import tokenization # папка, куда распаковали преодобученную нейросеть BERT folder = 'multi_cased_L-12_H-768_A-12' config_path = folder+'/bert_config. Prior to this the most high profile incumbent was Word2Vec which was first published in 2013. Semantics-aware BERT for Language Understanding Zhuosheng Zhang1,2,3,, Yuwei Wu1,2,3,4,*, Hai Zhao1,2,3,y, Zuchao Li1,2,3, Shuailiang Zhang1,2,3, Xi Zhou5, Xiang Zhou5 1Department of Computer Science and Engineering, Shanghai Jiao Tong University 2Key Laboratory of Shanghai Education Commission for Intelligent Interaction and Cognitive Engineering, Shanghai Jiao Tong University, Shanghai, China. 0 国際ライセンス (CC BY 4. The input to BertTokenizer was the full text form of the sentence. These span BERT Base and BERT Large, as well as languages such as English, Chinese, and a multi-lingual model covering 102 languages trained on wikipedia. はじめに BERTが何なのかという説明はありません(できません(T_T))。 とりあえずbert使って出力をだすとこまでやってみた！という記事です。 やったことまとめ pytorch から BERT日本語Pretrain. Rather, it looks at WordPieces. Implementation of the BERT. Bert helps Google understand natural language text from the Web. Google believes this step (or progress. For example ‘gunships’ will be split in the two tokens ‘guns’ and ‘##hips’. BERT uses WordPiece tokenization. spaCy’s gold. py Apache License 2. IMDB classification on Kaggle - shows how to easily interact with a Kaggle competition from a Colab, including downloading the data and submitting the results. In "coffee break" discussions, it is often mentioned that the multi-lingual BERT model lags behind the monolingual models in terms of quality and cannot serve as a. This will be a very hands on workshop where we will finish coding the Transformer model. Prior to this the most high profile incumbent was Word2Vec which was first published in 2013. We have now preprocessed our data and we are now ready to create BERT representations from our text data. Only has an effect when do_wordpiece_only=False do_basic_tokenize: Whether to do basic tokenization before wordpiece. # LIMIT-BERT obtains new state-of-the-art or competitive results on both span and dependency semantic parsing on Propbank benchmarks and both. I have seen that NLP models such as BERT utilize WordPiece for tokenization. However, as compared to other text embedding models such as Universal Sentence Encoder (USE) or Elmo which can directly consume a list of…. the level of tokenization in the input representation (character, word-piece, or word tokenization). Project: BERT Author: yyht File: tokenization. It determines how the text is tokenized, which tokens are known, and which value is assigned to them. Can I ask a silly question that bert_tokenization is a library of tensorflow2. So when BERT was released in 2018, it included a new subword algorithm called WordPiece. For all training methods of all Transformer models, the learning rate schedule is set to l r = η ⋅ d − 0. The following excerpt is taken from the book Mastering Text Mining with R, co-authored by Ashish Kumar and Avinash Paul. py / Jump to Code definitions TokenizationTest Class test_full_tokenizer Function test_chinese Function test_basic_tokenizer_lower Function test_basic_tokenizer_no_lower Function test_wordpiece_tokenizer Function test_convert_tokens_to_ids Function test_is_whitespace Function test_is_control Function test_is_punctuation. All the above operations are effortlessly handled by BERT's own tokenization package. bertで言葉のベクトルをkerasで利用できるようにしてみましょう!. It uses character-level tokenization. runclassifier. BERT uses wordpiece tokenization (Wu et al. Here’s a quick summary: * BERT is pre-trained on two unsupervised tasks: sentence reconstruction and next sentence prediction. BERT models are available on Tensorflow Hub (TF-Hub). A “token” in natural language terms is “ an instance of a sequence of characters in some particular document that are grouped together as a useful semantic unit for processing. split for s in texts] vecs = bc. Dive deep into the BERT intuition and applications: Suitable for everyone: We will dive into the history of BERT from its origins, detailing any concept so that anyone can follow and finish the course mastering this state-of-the-art NLP algorithm even if you are new to the subject. Next we feed the tokenizer with each sentence in our datsaset. encode ([ 'hey you' , 'whats up?' , '你好么？' , '我 还 可以' ]) tokens: [CLS] hey you [SEP] input_ids: 101 13153 8357 102 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 input_mask: 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tokens: [CLS. This book lists various techniques to extract useful and high-quality information from your textual data. Verified account Protected Tweets @; Suggested users. Designed and implemented a biLSTM-CRF model that performs joint tokenization, sentence boundary detection and Part-of-Speech tagging. We have now preprocessed our data and we are now ready to create BERT representations from our text data. Model: "model_6" _____ Layer (type) Output Shape Param # Connected to ===== input_ids (InputLayer) [(None, 256)] 0 _____ input_masks (InputLayer) [(None, 256)] 0. BERT日本語Pretrainedモデル †. How and to what extent does BERT encode syntactically-sensitive hierarchical information or positionally-sensitive linear information? Recent work has shown that contextual representations like BERT perform well on tasks that require sensitivity to linguistic structure. tokenization' I tried to install bert by running the following command:!pip install --upgrade bert Any idea how to resolve this error?. You can find more about BERT tokenization here, Pre-training with your own corpus is discussed here. tokenization. Conclusion. If we skip this step then there is a higher chance that you are working with noisy and inconsistent data. These span BERT Base and BERT Large, as well as languages such as English, Chinese, and a multi-lingual model covering 102 languages trained on wikipedia. BERT is a model that has broken several records for the success of solving a number of NLP problems. Implementation of the BERT. bert Bidirectional Encoder Representation from Transformers. BERT预训练过程分为两个具体子任务：Masked LM 和 Next Sentence Prediction. NICT BERT 日本語 Pre-trained モデル 概要. passed the tokenized sentences to the BERT model for inference to output embeddings, and then clustered the embeddings with K-Means, selecting the embedded sentences that were closest to the centroid as the candidate summary sentences. This tokenizer inherits from PreTrainedTokenizerFast which contains most of the methods. I have seen that NLP models such as BERT utilize WordPiece for tokenization. We present an end-to-end approach for knowledge-grounded response generation in Dialog System Technology Challenges 7 (DSTC7). BERTTokenizer (vocabulary, lower = True) # The maximum length of an input sequence max_len = 128 # The labels for the two classes. 5 , s t e p ⋅ w a r m u p _ s t e p s − 1. BERT has worked on at max 512 sequence length. An n-gram model is a type of probabilistic language model for predicting the next item in such a sequence in the form of a (n − 1)–order Markov model. The XLNet paper goes over this point pretty thoroughly. BERT is a model that broke several records for how well models can handle language-based tasks. Browse our catalogue of tasks and access state-of-the-art solutions. Breakin' 2: Electric Boogaloo is an American 1984 film directed by Sam Firstenberg. BERT uses WordPiece tokenization rather than whole-word tokenization (although there are whole words in its vocabulary). uncased_L-12_H-768_A-12. Especially when words are chunked into small parts, we believe the model will have a difficult time making sense of the individual chunks. BERT can take as input either one or two sentences, and expects special tokens to mark the beginning and end of each one: 2 Sentence Input: [CLS] The man went to the store. BERT Transformer発表後、Attentionを用いた自然言語処理研究が活発になり、様々な高精度のモデルが提唱されました。その1つがBERT [arXiv:1810. Simply split sentence to words and punctuation based on whitespace. Before setting up the model, we build a tokenization of our dataset according to the format expected by the BERT layers, and this can be done via the FullTokenizer class from the bert package. Designed and implemented a biLSTM-CRF model that performs joint tokenization, sentence boundary detection and Part-of-Speech tagging. tokenization import FullTokenizer from tqdm. Tokenizer the tokenizer class deals with some linguistic details of each model class, as specific tokenization types are used (such as WordPiece for BERT or SentencePiece for XLNet). Next, the tokens from the sentence are printed. The Token. (Note that this only applies for Colab. allennlp / packages / pytorch-pretrained-bert 0. If the word as a whole is not in the vocabulary, the tokenizer searches for the longest prefix. The only difference is that instead of merging the most frequent symbol bigram, the model merges the bigram that, when merged, would increase the likelihood. From character-based to word-based tokenization. - I've simplified the tokenization and input formatting by using the tokenizer. BertUsetransformerAs a feature extractor, a two-way language model is adopted. Later in the month, Google releases multilingual BERT that supports about 100 different languages. Tokenization. BERT, or Bidirectional Encoder Representations fromTransformers, is a new method of pre-training language representations whichobtains state-of-the-art results on a wide array of Natural Language Processing(NLP) tasks. import bert_tokenization as tokenization 마십시오! TensorFlow 2. Often you want to use your own tokenizer to segment sentences instead of the default one from BERT. Figure 1: BERT. Get the latest machine learning methods with code. This approach showed state-of-the-art results on a wide range of NLP tasks in English. BERT was released together with the paper BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding by Jacob Devlin et al. encode ([ 'hey you' , 'whats up?' , '你好么？' , '我 还 可以' ]) tokens: [CLS] hey you [SEP] input_ids: 101 13153 8357 102 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 input_mask: 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tokens: [CLS. Hugging Face is an NLP-focused startup with a large open-source community, in particular around the Transformers library. Users should refer to the superclass for more information regarding methods. Tokenization. sent_tokenize(input_data)。. The model for Chinese is separate. Rather, it looks at WordPieces. encode_plus function. Create the tokenizer with the BERT layer and import it tokenizer using the original vocab file. BERT模型用于文本分类的笔记 tokenization_test. , 2016) shipped together with the BERT model for tokenization. 13 with the following results: As you can see Bling Fire is much faster than existing tokenizers for BERT based models. This will be a very hands on workshop where we will finish coding the Transformer model. py是对原始文本语料的处理，分为BasicTokenizer和WordpieceTokenizer两类。 BasicTokenizer. Predicting Movie Review Sentiment with BERT on TF Hub - shows how to use a BERT module for classification. This edition includes new results from NLP-Progress, a discussion about COVID-19 and what you can do to help, an update of the venerable Hutter Prize, which uses compression as a test for AGI, the latest resources around BERT and monolingual BERT models, an introduction to Green AI, and as usual lots of other resources, blog posts, and papers. It means that a word can be broken down into more than one sub-words. from_json_file(bert_config_file). Transformer models, especially the BERT model, have revolutionized NLP and broken new ground on tasks such as sentiment analysis, entity extractions, or question-answer problems. We use the corresponding pre-trained byte-pair-encoding (Sennrich et al. Contribute to google-research/bert development by creating an account on GitHub. このコンペは同じ質問が何度も使われており，使われる頻度が重要なヒントになっています． そのため，bert単体では，. from bert import tokenization. Today we are excited to open source our German BERT model, trained from scratch, that significantly outperforms the Google multilingual model on all 5 downstream NLP tasks we evaluated on. Sci Bert Huggingface. JuTzungKuei. Enter The Super Duper NLP Repo, another fantastic resource also put together by Quantum Stat. It's much faster than the full BERT model without sacrificing much in the way of performance. In order to deal with the words not available in the vocabulary, BERT uses a technique called BPE based WordPiece tokenization. Natural language processing (NLP) is used for tasks such as sentiment analysis, topic detection, language detection, key phrase extraction, and document categorization. To feed our text to BERT, it must be split into tokens, and then these tokens must be mapped to their index in the tokenizer vocabulary. Learn SentencePiece vocabulary. align helper returns a (cost, a2b, b2a, a2b_multi, b2a_multi) tuple describing the number of misaligned tokens. Before we process the entire dataset using this tokenizer, there are a few conditions that we need to satisfy in order to setup the training data for BERT: Add special tokens at the start and end of each sentence. The input to BERT is preprocessed using WordPiece tokenization (Johnson et al. BERT in bert4tf is implemented as a Keras layer. WordPiece或者BPE这么好，我们是不是哪里都能这么用呢？其实在我们的中文中不是很适用。首先我们的中文不像英文或者其他欧洲的语言一样通过空格分开，我们是连续的。. The model is based on the Transformer architecture introduced in Attention Is All You Need by Ashish Vaswani et al and has led to significant improvements on a wide range of downstream tasks. Bert-base Chinese BERT-wwm ：由哈工大和讯飞联合实验室发布的，效果比Bert-base Chinese要好一些(链接地址为讯飞云，密码：mva8。无奈当时用wwm训练完提交结果时，提交通道已经关闭了，呜呜) bert_model. Each article was written jointly by both authors. I will also cover simple extensions of the AIgent, its cross-media potential, its power as an unbiased, content-based recommender system, and its capacity to increase. The first. 13 with the following results: As you can see Bling Fire is much faster than existing tokenizers for BERT based models. This progress has left the research lab and started powering some of the leading digital products. encode ([ 'hey you' , 'whats up?' , '你好么？' , '我 还 可以' ]) tokens: [CLS] hey you [SEP] input_ids: 101 13153 8357 102 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 input_mask: 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tokens: [CLS. edu ABSTRACT In the last two decades, automatic extractive text summarization on lectures has demonstrated to be a useful tool for collecting key phrases and sentences that best. Private Score. sentence, and utilize BERT self-attention matrices at each layer and head and choose the entity that is attended to most by the pronoun. import tensorflow as tf import pandas as pd import tensorflow_hub as hub import os import re import numpy as np from bert. # coding: utf-8 import sys import codecs import numpy as np from keras_bert import load_trained_model_from_checkpoint import tokenization # папка, куда распаковали преодобученную нейросеть BERT folder = 'multi_cased_L-12_H-768_A-12' config_path = folder+'/bert_config. Perhaps most famous due to its usage in BERT, wordpiece is another widely used subword tokenization algorithm. Tokenization differences. To account for the differences in the size of Wikipedia, some. Before setting up the model, we build a tokenization of our dataset according to the format expected by the BERT layers, and this can be done via the FullTokenizer class from the bert package. Word embedding is the collective name for a set of language modeling and feature learning techniques in natural language processing (NLP) where words or phrases from the vocabulary are mapped to vectors of real numbers. BERT in DeepPavlov¶ BERT (Bidirectional Encoder Representations from Transformers) is a Transformer pre-trained on masked language model and next sentence prediction tasks. BERT was released together with the paper BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding by Jacob Devlin et al. They are then passed to the DistilBERT neural net to produce 'embeddings'. 本文档介绍了如何使用BERT实现多类别文本分类任务，适合稍微了解BERT和文本分类的同学参考。 （一） 下载. PreTrainedTokenizerFast which contains most of the methods. , 2017)+ELMo (Peters et al. Description. SEQ_LEN is a number of lengths of the sequence after tokenizing. Official pre-trained models could be loaded for feature extraction and prediction. A great example of this is the recent announcement of how the BERT model is now a major force behind Google Search. BERT models might be one of the biggest changes to the natural language processing landscape in the last few years. NLP Tutorial Using Python NLTK (Simple Examples) 2017-09-21 2019-01-08 Comments(30) In this post, we will talk about natural language processing (NLP) using Python. The "Fast" implementations allows (1) a significant speed-up in particular when doing batched tokenization and (2. A tokenizer is in charge of preparing the inputs for a model. Modeling includes the BERT model implementation and tokenization is obviously for tokenizing the sequences. Args: vocab_file: path to vocabulary do_lower_case: set True if lowercasing is needed max_seq. In addition, Bert pre-training data is very large. InputExample(guid , text_a = , textb = , label= )处理成bert可读形式。text_a的格式接受pd. bert-pretrained-example. This file was created from a Kernel, it does not have a description. bert / tokenization_test. module 'tokenization' has no attribute 'FullTokenizer' #638. Tokenization & Input Formatting. And download uncased large pre-trained model of bert with WordPiece tokenization. They just split off punctuation. I wanted to try a different way for tokenizing in BERT. Use the following command to fine-tune the BERT large model on SQuAD 2. For SQuAD 2. 目前有两种多语言模型可供选择。我们不打算发布更多单语言模型，但可能会在未来发布这两种模型的BERT-Large版本： BERT-Base, Multilingual: 102 languages, 12-layer, 768-hidden, 12-heads, 110M parameters. 04805] です。BERTとは Bidrectional Encoder Representations from Transformers の略で、その名の通り、双方向性とTransformerを特徴とします。. In WordPiece, we split the tokens like playing to play and ##ing. Textual Tokenization Due to the variability of the quality of text from lecture. When the models have been pre-trained on large corpora by corporations, data scientists can apply transfer learning to these multi-purpose trained. It is a sequel to the 1984 breakdancing film Breakin'. BERT is NLP Framework which is introduced by Google AI’s researchers. Google thinks applying BERT models to search - currently what they're doing - will affect about 10 percent of searches and make the search landscape better for everyone. Conclusion. Our team at Korea University, led by Dr. If tags are provided, calculates tags for subtokens. Here is an example of tokenization: Input: Friends, Romans, Countrymen, lend me your ears; Output:. ml and BERT integration. the level of tokenization in the input representation (character, word-piece, or word tokenization). Includes use of bert library for tokenization and preprocessing. Hey everyone. This approach showed state-of-the-art results on a wide range of NLP tasks in English. We have shown that the standard BERT recipe (including model architecture and training objective) is effective on a wide range of model. , "James Bond" becomes "james bond". com/9gwgpe/ev3w. Typical values are between -1. , John Smith becomes john smith, on the other hand, cased means that the true case and accent markers are preserved. This way, the BERT will be trained jointly with the Linear layer. the multilingual cased pretrained BERT model. Prior to connecting the BERT-based answer veriﬁer with the BiDAF-based answer. Rather, it looks at WordPieces. tokenization. It is a new pre-training language representation model which obtains state-of-the-art results on various Natural Language Processing (NLP) tasks. I would say this kind of tokenization was probably. In this post we compare the performance of our German model against the multilingual. Bert 也不例外，但是 Bert 能以 字级别 作为输入，在处理中文文本时我们可以不用先分词，直接用 Bert 将文本转换为 token，然后用相应的 id 表示。 tokenization 库就是用来将文本切割成为 字或词 的，下面对其进行简单的介绍. GitHub Gist: instantly share code, notes, and snippets. Recently a new language representation model, BERT (Bidirectional Encoder Representations from Transformers), facilitates pre-training deep bidirectional. The Overflow Blog Build your technical skills at home with online learning. bert-as-service client. This tokenizer inherits from PreTrainedTokenizerFast which contains most of the methods. In this article, I will discuss the construction of the AIgent, from data collection to model assembly. You can now use these models in spaCy, via a new interface library we've developed that connects spaCy to Hugging Face's awesome implementations. Why a German BERT Model? Although the multilingual models released by Google have increased vocab sizes (> 100k tokens) and cover quite a lot of German text, we realized its limitations. bert-as-service. It is mentioned that it covers a wider spectrum of Out-Of-Vocabulary (OOV) words. Perform sentence tokenization and word tokenization in Spacy. meta └── vocab. Bert 也不例外，但是 Bert 能以 字级别 作为输入，在处理中文文本时我们可以不用先分词，直接用 Bert 将文本转换为 token，然后用相应的 id 表示。 tokenization 库就是用来将文本切割成为 字或词 的，下面对其进行简单的介绍. py Apache License 2. In WordPiece, we split the tokens like playing to play and ##ing. Let's define fertility , borrowed from statistical machine translation, as the average number of BERT word pieces corresponding with a single real token. BERT-large: 24 Encoders with 24 bidirectional self-attention heads; Both BERT-base and BERT-large has Cased and Uncased versions. Only has an effect when do_wordpiece_only=False do_basic_tokenize: Whether to do basic tokenization before wordpiece. 3 Pretraining We next introduce the sources of unlabeled data used to pretrain FinBERT and present the data ﬁltering and cleanup, vocabulary generation, and pretraining processes. 多语言模型支持的语言是维基百科上语料最大的前100种语言（泰语除外）。. This is Part 1/2 of Dissecting BERT written by Miguel Romero and Francisco Ingham. Parameters needed for training. txt # 字符编码 之后的各种NLP任务都可以用这个模型。. Tokenization & Input Formatting. ~91 F1 on SQuAD for BERT, ~88 F1 on RocStories for OpenAI GPT and ~18. You can find more about BERT tokenization here, Pre-training with your own corpus is discussed here. BERT模型用于文本分类的笔记 tokenization_test. BERT模型是谷歌提出的基于双向Transformer构建的语言模型。BERT模型和ELMo有大不同，在之前的预训练模型（包括word2vec，ELMo等）都会生成词向量，这种类别的预训练模型属于domain transfer。而近一两年提出的ULMFiT，GPT，BERT等都属于模型迁移。. Next, the tokens from the sentence are printed. 首先，在github上clone谷歌的BERT项目，或者直接下载。项目地址. 然后，下载中文预训练模型，地址 （二） 环境准备. tokenization을 가져올 수 없습니다 2019-06-12 python-3. tokenization. BERT uses WordPiece tokenization. encode_plus function. In this article, I will discuss the construction of the AIgent, from data collection to model assembly. This video shows: - Popular BERT implementation - Creating Custom Datasets and using it in DataLoader - Tokenization using BERT tokenizer - Using pad_sequence to make it of the same length. InputExample(guid , text_a = , textb = , label= )处理成bert可读形式。text_a的格式接受pd. >>> wordpiece. BERT was released together with the paper BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding by Jacob Devlin et al. That is saying, if we want to increase the model size (larger ), we need to learn a larger tokenization embedding too, which is expensive because it depends on the vocabulary size ( ). max_len: An artificial maximum length to truncate tokenized sequences to; Effective maximum length is always the minimum of this value (if specified) and the underlying BERT model's sequence length. The algorithm (outlined in this paper) is actually virtually identical to BPE. The library comprise tokenizers for all the models. import tensorflow as tf import pandas as pd import tensorflow_hub as hub import os import re import numpy as np from bert. Typical values are between -1. Includes use of bert library for tokenization and preprocessing. Default: True -pooling_layer. BERT-Base, uncased uses a vocabulary of 30,522 words. com for their generous support of As Blocktrade. Tokenization. A linear learning rate decay and a batch size of 2048 are used, all leading to roughly 2. At the end of every sentence, we need to append the special [SEP] token. BERT models are available on Tensorflow Hub (TF-Hub). BERT is Not an Interlingua and the Bias of Tokenization Jasdeep Singh1, Bryan McCann2, Caiming Xiong2, Richard Socher2 Stanford University1, Salesforce Research2 [email protected] Usage BasicTokenizer. 0 5 votes def _is_whitespace(char): """Checks whether chars is a whitespace character. For example, if I tokenize the sentence “Hi, my name is Dima” I’ll get: tokenizer. Google提供のBERTライブラリ（tokenizationモジュール）中のFullTokenizerクラスを用いて入力データのトークン化を行います。 結果を用いて、ニューラルネットワークにデータを入力する為の関数を定義します。. Tip: you can also follow us on Twitter. py / Jump to. BERT’s clever language modeling task masks 15% of words in the input and asks the model to predict the missing word. And download uncased large pre-trained model of bert with WordPiece tokenization. Often you want to use your own tokenizer to segment sentences instead of the default one from BERT. How and to what extent does BERT encode syntactically-sensitive hierarchical information or positionally-sensitive linear information? Recent work has shown that contextual representations like BERT perform well on tasks that require sensitivity to linguistic structure. uncased_L-12_H-768_A-12. bz2: 1 year and 3 months ago. Huge transformer models like BERT, GPT-2 and XLNet have set a new standard for accuracy on almost every NLP leaderboard. With the different word pieces comes the different tokenisation. From character-based to word-based tokenization. 首先，在github上clone谷歌的BERT项目，或者直接下载。项目地址. Natural language toolkit (NLTK) is the most popular library for natural language processing (NLP) which was written in Python and has a big community behind it. Choosing a natural language processing technology in Azure. All previous efforts considered one side of a word at a time – either the left or the right. never_split: List of tokens. 随着 Bert as service 代码的开源，使用 Bert 分类或阅读理解的副产物--词空间，成为一个更具实用价值的方向。 因而，此文档着重以一个例子，梳理 finetune 垂直语料，获得微调后的模型 这一过程。Bert 原理或 Bert as service 还请移步官方文档。 依赖 python==3. このコンペは同じ質問が何度も使われており，使われる頻度が重要なヒントになっています． そのため，bert単体では，. User generated text on social media often suffers from a lot of undesired characteristics including hatespeech, abusive language, insults etc. Use the following command to fine-tune the BERT large model on SQuAD 2. json' checkpoint_path = folder+. Includes use of bert library for tokenization and preprocessing. tokenization. x run_pretraining (see you next part) 1、分词（tokenization. Public Score. You could instantiate it like this: from bert4tf import BertModelLayer l_bert = BertModelLayer (** BertModelLayer. py / Jump to. 0 5 votes def _is_whitespace(char): """Checks whether chars is a whitespace character. IMDB classification on Kaggle - shows how to easily interact with a Kaggle competition from a Colab, including downloading the data and submitting the results. do_basic_tokenize — Whether to do basic tokenization before. Contribute to google-research/bert development by creating an account on GitHub. pre-trained BERT weights. Bert Strassburg gefällt das. Can I ask a silly question that bert_tokenization is a library of tensorflow2. BERT uses WordPiece tokenization for pre-processing, but for some reason, libraries or code for creating a WordPiece vocabulary file seem hard to come by. During any text data preprocessing, there is a tokenization phase involved. Tokenization. Below is a sentence tokenized using the WordPiece vocabulary from a pre-trained English BERT-base model from the official repo. To see that more clearly, this is what the BERT model actually receives after tokenization: bc. , it becomes easier to extract information from the text and apply machine learning algorithms to it. # LIMIT-BERT obtains new state-of-the-art or competitive results on both span and dependency semantic parsing on Propbank benchmarks and both. A linear learning rate decay and a batch size of 2048 are used, all leading to roughly 2. 干货 | BERT fine-tune 终极实践教程. There is a wide range of packages available in R for natural language processing and text mining. @register ('bert_ner_preprocessor') class BertNerPreprocessor (Component): """Takes tokens and splits them into bert subtokens, encodes subtokens with their indices. √ tokenization. A meaningful representation of the input, you must encode. Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Simple tool for tokenizing sentences, for BERT or other NLP preprocessing. The tokenizer available with the BERT package is very powerful. This progress has left the research lab and started powering some of the leading digital products. Includes use of bert library for tokenization and preprocessing. The use of WordPiece tokenization enables BERT to only store 30,522 “words” in its vocabulary and very rarely encounter out-of-vocab words in the wild when tokenizing English texts. Much recently in October, 2018, Google released new language representation model called BERT, which stands for "Bidirectional Encoder Representations from Transformers". The preprocessing of the text data is an essential step as it makes the raw text ready for mining, i. Description. 3 python -m spacy download en. BERT doesn't look at words as tokens. Later in the month, Google releases multilingual BERT that supports about 100 different languages. In feature extraction demo, you should be able to get the same extraction results as the official model chinese_L-12_H-768_A-12. Now, we move on to handling the third point: using BERT's pre-built vocabulary.