Aspect based sentiment analysis using LLMs

This repository contains the code for the paper "Large language models for aspect-based sentiment analysis" by Paul Simmering and Paavo Huoviala.

Task and benchmark

The task is Aspect-Based Sentiment Analysis (ABSA) on SemEval 2014 Task 4 Subtask 1+2. See the benchmark on Papers with Code.

We are unable to share the data-set used directly, but it is available from: http://metashare.elda.org/repository/browse/semeval-2014-absa-test-data-gold-annotations/b98d11cec18211e38229842b2b6a04d77591d40acd7542b7af823a54fb03a155/

Given a review sentence, the task is to extract the aspects and their polarity.

Example input:

The food was great, but the service was awful.

Example output:

{
    "aspects":
        [
            {"term": "food", "polarity": "positive"},
            {"term": "service", "polarity": "negative"}
        ]
}

We test if OpenAI's GPT-models can solve this task in a zero-shot, few-shot setting, and fine-tuned settings.

Requirements

• Python 3.10.9
• Packages listed in pyproject.toml, install with poetry install
• OpenAI API key placed in a file called .env in the root directory of the repository

Please note that using the OpenAI API costs money.

The pins package is used for storing the model outputs and the evaluation results. By default the S3 backend of AWS is used.

Please create a .env file in the root directory of the repository with the following contents:

OPENAI_API_KEY=<your key>
AWS_ACCESS_KEY_ID=<your key>
AWS_SECRET_ACCESS_KEY`=<your key>

Using this project

1. Adjust settings in project.cfg and prompts in the prompts/ directory.
2. Run python finetune.py to finetune a model, if required.
3. Run python hyper.py to get the results. Check the cost and approve the run.
4. Run python evaluate.py to parse and evaluate the model outputs.
5. Run the Quarto notebook paper/paper.qmd to visualize the results and typeset the paper.