This is the code for the paper Are Hallucinations Bad Estimations? You can use this repo to reproduce the results in the paper.

1. Clone the repository

   gh repo clone MAGICS-LAB/hallucination
   cd hallu

2. Create and activate a virtual environment

   conda create -n hallu python=3.11
   conda activate hallu

3. Install required packages

   pip install -r requirements.txt

Please refer to coinflip_experiment.ipynb.

python hallucination_llm.py

1. Fine-tune Unet

   python text_to_img_exp/fine-tune_text_to_img.py
       -- output_dir "./model"

2. Hallucination Rate Analysis with Frozen Model

   python text_to_img_exp/hallucination_text_to_img_report.py                  
       --checkpoints_glob "./model/checkpoint-*/unet"

python plotting_llm.py # for plotting of Figure 4
python plotting_text_to_img.py # for plotting of Figure 5
python ablation_plotting_text_to_img.py # for ablation study plots

If you find our work useful, please cite:

@article{liu2025hallucinations,
  title={Are Hallucinations Bad Estimations?},
  author={Liu, Hude and Hu, Jerry Yao-Chieh and Zhang, Jennifer Yuntong and Song, Zhao and Liu, Han},
  journal={arXiv preprint arXiv:2509.21473},
  year={2025}
}