README

This is the source code of the EMNLP 2019 paper Event Detection with Trigger-Aware Lattice Neural Network . TLNN model aims to address the issues of trigger-word mismatch and trigger polysemy. In this project, the event detection is a sequence labeling task. For more information, please read the paper.

Requirements

• Python 3.6

• Pytorch 0.3.0

• CUDA 0.9

• Numpy

Datasets

Datasets in our paper is ACE2005 and KBP Eval 2017. According to terms of LDC, we can not share the data to the third party. But if you have LDC license, you can obtain the two datasets with the LDC numbers:

• ACE 2005: LDC2006T06

  

• KBP Eval 2017: LDC2017E55

  

Data Format

train/dev/test

The task is regarded as a sequence labeling task. The training, dev and test data is expected in standard tab-separated format. One word per line, separate column for token and label, empty line between sentences. The first line of each sentence is the document id corresponding to golden set.

for each word, the first column is the token, the second column is the character index, the last column is the tag of event type. For example:

	sid:CTS20001223.1300.0809
	歹 297 O
	徒 298 O
	抢 300 B-Conflict:Attack
	得 301 O
	实 302 O
	在 303 O

Pretrained Character embedding

One character per line. For each line, the first column is the character, the rest columns is the value of the embedding of the character.

Pretrained Sense (Chars & Words) embedding

Similar to character embedding but for word senses. For example:

 苹果#1 0.304095 ...
 苹果#2 -0.175496 ...
 香蕉 -0.230772 ...

where Word#n means that it is the n-th sense of word A, The pretrained word senses embedding could be obtained by SAT.

Sense map

Records all senses for each polysemous word, corresponding to the word sense embedding. One word per line, for each line, the first column is the word, and the rest columns are all the senses of it ( if exits ). For example:

 苹果 苹果#1 苹果#2
 香蕉

test.golden.dat

Recodes the answer of all triggers with location and event types for evaluations. One trigger per line, the columns are doucment id, start index of character, trigger word length, trigger word and event type. For example:

 CTV20001227.1330.0447	57	2	宣判	Justice:Sentence
 CTV20001227.1330.0447	131	2	判处	Justice:Sentence
 CTV20001227.1330.0447	110	2	判处	Justice:Sentence
 CTV20001227.1330.0447	51	2	上诉	Justice:Appeal
 CTV20001227.1330.0447	288	2	上诉	Justice:Appeal

How to Run

Arguments of the code are set in config.py, which contains

 status = 'train'								Status of the program
 savemodel = 'data/model/test'							Path of the saved model
 savedset = 'data/model/test.dset'						Path of the saved data settings
 TRAIN = 'trainid_BIO.txt'							Path of the training data
 dev = 'devid_BIO.txt'								Path of the dev data
 test = "testchrid_BIO.txt"							Path of the test data
 loadmodel = 'data/model/test.model'						Path of the model to load
 output = 'data/test.output'							Path of the output
 lr = 0.015									Learning rate
 maxlen = 300									Max length of each sequence
 dataset = 'ace'								Dataset name
pretrain_char_emb = 'char.vec'							Pre-trained character embeddings
pretrain_sense_emb = 'sense.vec'						Pre-trained sense embeddings
pretrain_word_emb = 'word.vec'							Pre-trained word embeddings

With appropriate data settings, you could run the code with:

python train.py

Citation

@inproceedings{ding2019event,
  title={Event Detection with Trigger-Aware Lattice Neural Network},
  author={Ding, Ning and Li, Ziran and Liu, Zhiyuan and Zheng, Haitao and Lin, Zibo},
  booktitle={Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP)},
  pages={347--356},
  year={2019}
}

Contact

For any questions, please contact:

• dingn18@mails.tsinghua.edu.cn
• lizr18@mails.tsinghua.edu.cn