🏆 Award-Winning Project: Recipient of the MIT Open Data Prize 2022.

MIT Open Data Prize 2022

DeepWTO

About the Project

This project collects legalNLP data to predict whether a legal article of WTO rulings can be applied to the given textual description of dispute between two countries in WTO judicial body.

Background of the Project

Currnetly there exists no publicly shared dataset that researchers can share and study together in the field of LegalNLP. One of the main reason of this vacancy is because of the locality of the law. Thus this repo aims to prepare publicly available LegalNLP dataset within the field of International Law which is operating globally in English. Moreover, to let the researchers to understand how deep Learning could be implemented, the repo provides sample model code with the prepared dataset.

Goal of the Project

This project is assumed to achieve following two main goals:

1. Build a Legal NLP Dataset so that everyone can participate in this legal prediction/classification agenda in objective manner
2. Performs a classification with a neural network to achieve the naive-baseline, 0.5 < AUC-ROC of the classification task.

Dataset

Basically, the WTO panel process determines whether a country's government measure at issue is contrary or not contrary to a certain article(s) of rules of WTO, by explicitly saying as following :

"Korea’s domestic support for beef in 1997 and 1998 exceeded the de minimis level contrary to Article 6 of the Agreement on Agriculture."

Government Measure

Government measure is the most tricky part to prepare the data to train. Government measure is usually descriptive and case-specific, therefore it is hard to be generalized across the cases. Moreover, Government measure has no strictly enforced formatting style but mainly depends on the preference of each panel body. Therefore, for the first version of the dataset, we just naively includes all the text strings that can be found under the chapter-name of Factual Aspect in every Panel Report.

Normally, description about the Government Measure could be found at following classes of WTO documents:

• Factual Aspects in Panel Report [example]
• Request for Consultations [example]
• Request for the Establishment of a Panel [example]

Download of Data

• Download train_data.json and test_data.json

  Googl Drive

• Each data instance looks as following:

    {"testid": [DS_number]_[Article Name]
     "gov": Textual description of Goverment Measure
     "art": Article contents correponding to [Article Name] 
     "label": [0] if not cited, [1] if cited}   
    
    * [DS_number] is an unique identification code for each case requested to WTO
    * Example of [Article Name] is Article I:1, Article III:4, etc.
  

• After Download

  place the downloaded train_data.json and test_data.json to your preferred PATH. Then edit the TRAININGSET_DIR and VALIDATIONSET_DIR variable in models/cite_wa/OneLabelTextCNN/train.py with PATH.

• In case you don't have GoogleNews-vectors-negative300.bin

  Download GoogleNews-vectors-negative300.bin.gz from Googl Drive and gunzip it to your preferred PATH. Then edit the word2vec_path argument at the last line of models/cite_wa/OneLabelTextCNN/train.py with PATH.

Reproduce

git clone https://github.com/syyunn/DeepWTO
cd DeepWTO
conda env create -f environment.yaml 
python -m spacy download en # download spacy model to tokenize 

cd models/cite_wa/OneLabelTextCNN
python train.py

Code Structure

Path	Description
DeepWTO	Main folder.
├  assests	Images required in README
├  models	TF Models for different tasks code with data
├  cite	Prediction of which articles being cited without legal text (multi label classification; Deprecated)
└  cite_wa	Prediction of whether an article is cited with article content (one label classification)
├  prep	Storage of codes to prepare data for all different tasks
├  download	Codes to crawl/cleanse the data from WTO database / Crawl Results
├  factual	Codes to parse factual aspects parts from the Panel Report
├  label	Codes and Raw data that is to be used as label
└  cite	Codes and Raw data to prepare labels to be used in citability prediction task
└  provision	PDF and TEXT file that contains raw data of legal provisions
├  utils	Simple util codes to use
└  web	Front/Server codes to deploy the project (Currently Working)

Achievement

The model has achieved AUC-ROC 0.8432 in one-label-classification task (cite_wa) with test data.

The maximum of AUC-ROC is 1.

Also, the model has achieved Accuracy 92.04% in test data set with following statistics :

    Total Correct Prediction for label [1] is 37 out of 83
    Total Correct Prediction for label [0] is 2068 out of 2204

However, the preferred metric for the model performance is AUC-ROC because a naive-baseline of the Accuracy is 96.37% (2204/2287)when the model just keep predicting label [0] for every case. Since only a few number of articles are cited (label [1]) among entire articles for each case, it is more preferred to measure how the model precisely predicts the label [1] with AUC-ROC.

Paper

• More detailed and kind explanation about the project can be found in this preprint (or slides)
• Or, you may want to refer to this paper which explains how to use this data to find the correlation between legal articles in WTO rulings.

Author

Suyeol Yun

Special Thanks to RandolphIV

The repo has provided awesome model code to conduct document classification that this repo has referred to.