hierarchical-multi-label-text-classification-pytorch

Hierarchical Multi-label Text Classification: An Attention-based Recurrent Network Approach

This repository is a PyTorch implementation made with reference to this research project.

The main objective of the project is to solve the hierarchical multi-label text classification (HMTC) problem. Different from the multi-label text classification, HMTC assigns each instance (object) into multiple categories and these categories are stored in a hierarchy structure, is a fundamental but challenging task of numerous applications.

Introduction

Many real-world applications organize data in a hierarchical structure, where classes are specialized into subclasses or grouped into superclasses. For example, an electronic document (e.g. web-pages, digital libraries, patents and e-mails) is associated with multiple categories and all these categories are stored hierarchically in a tree or Direct Acyclic Graph (DAG).

It provides an elegant way to show the characteristics of data and a multi-dimensional perspective to tackle the classification problem via hierarchy structure.

The Figure shows an example of predefined labels in hierarchical multi-label classification of documents in patent texts.

• Documents are shown as colored rectangles, labels as rounded rectangles.
• Circles in the rounded rectangles indicate that the corresponding document has been assigned the label.
• Arrows indicate a hierarchical structure between labels.

Data

See data format in data folder which including the data sample files.

Text Segment

You can use jieba package if you are going to deal with the Chinese text data.

Data Format

This repository can be used in other datasets (text classification) in two ways:

1. Modify your datasets into the same format of the sample.
2. Modify the data preprocess code in data_helpers.py, data_loader.py.

Anyway, it should depend on what your data and task are.

Pre-trained Word Vectors

You can pre-training your word vectors(based on your corpus) in many ways:

• Use gensim package to pre-train data.
• Use glove tools to pre-train data.
• Even can use a fasttext network to pre-train data.
• This implementation used an embedding layer, but the original paper uses word2vec.

Network Structure

Built with

• Python 3.8
• Pytorch
• Numpy
• Sklearn