Named Entity Recognition as Dependency Parsing

Introduction

This repository contains code introduced in the following paper:

Named Entity Recognition as Dependency Parsing
Juntao Yu, Bernd Bohnet and Massimo Poesio
In Proceedings of the 58th Annual Conference of the Association for Computational Linguistics (ACL), 2020

Setup Environments

• The code is written in Python 2, the compatibility to Python 3 is not guaranteed.
• Before starting, you need to install all the required packages listed in the requirment.txt using pip install -r requirements.txt.
• Then download the BERT models, for English we used the original cased BERT-Large model and for other languages we used the cased BERT-Base multilingual model.
• After that modify and run extract_bert_features/extract_bert_features.sh to compute the BERT embeddings for your training or testing.
• You also need to download context-independent word embeddings such as fasttext or GloVe embeddings that required by the system.

To use a pre-trained model

• Pre-trained models can be download from this link. We provide all nine pre-trained models reported in our paper.

• Choose the model you want to use and copy them to the logs/ folder.

• Modifiy the test_path accordingly in the experiments.conf:

  • the test_path is the path to .jsonlines file, each line of the .jsonlines file is a batch of sentences and must in the following format:

  {"doc_key": "batch_01", 
  "ners": [[[0, 0, "PER"], [3, 3, "GPE"], [5, 5, "GPE"]], 
  [[3, 3, "PER"], [10, 14, "ORG"], [20, 20, "GPE"], [20, 25, "GPE"], [22, 22, "GPE"]], 
  []], 
  "sentences": [["Anwar", "arrived", "in", "Shanghai", "from", "Nanjing", "yesterday", "afternoon", "."], 
  ["This", "morning", ",", "Anwar", "attended", "the", "foundation", "laying", "ceremony", "of", "the", "Minhang", "China-Malaysia", "joint-venture", "enterprise", ",", "and", "after", "that", "toured", "Pudong", "'s", "Jingqiao", "export", "processing", "district", "."], 
  ["(", "End", ")"]]}
  

  • Each of the sentences in the batch corresponds to a list of NEs stored under ners key, if some sentences do not contain NEs use an empty list [] instead.

• Then use python evaluate.py config_name to start your evaluation

To train your own model

• You will need additionally to create the character vocabulary by using python get_char_vocab.py train.jsonlines dev.jsonlines
• Then you can start training by using python train.py config_name