maxent-ai/zeroshot_topics

Topic Inference with Zeroshot models

zeroshot_topics

Table of Contents

• Introduction
• Algorithm
• Installation
• Usage
• Roadmap
• License

Introduction

Hand-labelled training sets are expensive and time consuming to create usually. Some datasets call for domain expertise (eg: medical/finance datasets etc). Given these factors around costs and inflexibility of hand-labelling it would be nice if there are tools which can help us get started quickly with minimal labelled dataset - enter weak supervision.

But what if you do not have any labelled data at all? is there a way to still label your data automatically in some way? That's where zeroshot_topics might be useful! to help you to be up and running quickly.

zeroshot_topics let's you do exactly that! it leverages the power of zeroshot-classifiers, transformers & knowledge graphs to automatically suggest labels/topics from your text data. all you need to do is point it towards your data.

Algorithm

The algorithm contains, 4 stages:

1. Keyword & Keyphrase extraction: This is done with the help of KeyBERT. but really any sort of keyword extractor can be used.
2. Keyword/Keyphrase expansion via knowledge graphs/Taxanomy: Then we expand the important keywords we discovered by using some sort of taxanomy/knowledge graph like wordnet, conceptnet etc.
3. Trace the Hypernyms for the keywords: Identify the Hypernyms(the root/parent word) and use this as the psuedo-label for the zeroshot classifier.
4. Zeroshot classification: Use the Hypernyms and documents to label via zeroshot classifiers.

Note: Currently, this tends to work well on short-texts in general, in the future I intend to experiment and see how we can support long texts as well.

Installation

zeroshot_topics is distributed on PyPI as a universal wheel and is available on Linux/macOS and Windows and supports Python 3.7+ and PyPy.

$ pip install zeroshot_topics

Usage

from zeroshot_topics import ZeroShotTopicFinder

zsmodel = ZeroShotTopicFinder()

text = """can you tell me anything else okay great tell me everything you know about George_Washington.
he was the first president he was well he I'm trying to well he fought in the Civil_War he was a general
in the Civil_War and chopped down his father's cherry tree when he was a little boy he that's it."""

zsmodel.find_topic(text, n_topic=2)

# Output - Topics: ['War', 'Head Of State']

Roadmap

Some things that i plan to add in the coming days, if there's some interest in this work by the community.

• Support custom keyword extractors.
• Support Custom Knowledge-graphs & taxonomy.
• Support Custom Zeroshot-classifiers in the pipeline.
• Add Usecase examples & improve documentation.
• Optimise the overall library and make it a faster.
• Support Long Text documents.

License

zeroshot_topics is distributed under the terms of

• MIT License
• Apache License, Version 2.0