This repository contains the code for the paper It’s LeVAsa not LevioSA! Latent Encodings for Valence-Arousal Structure Alignment. The code has been tested on Pytorch 1.3.1 and Python 3.6.8.
In recent years, great strides have been made in the field of affective computing. Several models have been developed to represent and quantify emotions. Two popular ones include (i) categorical models which represent emotions as discrete labels, and (ii) dimensional models which represent emotions in a Valence-Arousal (VA) circumplex domain. However, there is no standard for annotation mapping between the two labelling methods. We build a novel algorithm for mapping categorical and dimensional model labels using annotation transfer across affective facial image datasets. Further, we utilize the transferred annotations to learn rich and interpretable data representations using a variational autoencoder (VAE). We present “LeVAsa”, a VAE model that learns implicit structure by aligning the latent space with the VA space. We evaluate the efficacy of LeVAsa by comparing performance with the Vanilla VAE using quantitative and qualitative analysis on two benchmark affective image datasets. Our results reveal that LeVAsa achieves high latent-circumplex alignment which leads to improved downstream categorical emotion prediction. The work also demonstrates the trade-off between degree of alignment and quality of reconstructions.
- AFEW emotional database: annotated with discrete VA values (between -10 and 10)
- Affectnet database: annotated with continuous VA values (between -1 and 1) and 11 discrete emotional labels
- IMFDB database: annotated with only 6 discrete emotion labels
The results in the paper can be reproduced using Code Notebooks/Experiments.ipynb. Saved weights can be obtained from here. IMFDB data images should be placed inside a subfolder within final_images/.
For transferring VA annotations, we use Affectnet as the anchor dataset and leverage various transfer sampling strategies which can be found in the Code Notebooks/Annotations_Transfer.ipynb notebook. The transferred annotations are saved as .json files, which can be found inside the Annotations folder.
The Code Notebooks/Models_Training_1.ipynb and Code Notebooks/Models_Training_2.ipynb notebooks contain the model classes and training scripts including the code to save checkpoints.
Contact:
- Vishaal Udandarao (vishaal16119@iiitd.ac.in)
- Surabhi S. Nath (surabhi16271@iiitd.ac.in)