X-Norm: Exchanging Normalization Parameters for Bimodal Fusion.

Yufeng Yin*, Jiashu Xu*, Tianxin Zu, and Mohammad Soleymani

Correspondence to:

• Yufeng Yin (yin@ict.usc.edu)

Introduction

This is the official Pytorch implementation for X-Norm: Exchanging Normalization Parameters for Bimodal Fusion.

This repo contains the following methods for multimodal fusion:

• Late fusion
• Early fusion
• Misa [1]
• MulT [2]
• Gradient-Blending [3]
• X-Norm (our method)

Overview

We present X-Norm, a novel, simple and efficient method for bimodal fusion that generates and exchanges limited but meaningful normalization parameters between the modalities implicitly aligning the feature spaces.

Overview for X-Norm

Architecture for NormExchange layer

Usage

Requirements

• Python 3.9
• PyTorch 1.11
• CUDA 10.1

Datasets and Pretrained Weights

Step 1: Download the RGB and Optical flow frames of kitchens P01, P08, and P22 from EPIC_KITCHENS-100 and put them into the data/epic_kitchens fold.

Step 2: Download the pretrained weights rgb_imagenet.pt and flow_imagenet.pt and put them into the checkpoints fold.

Run the Code

Unimodal methods (RGB or Optical flow)

python main.py --fusion rgb/flow

Multimodal methods

python main.py --fusion early/late/misa/mult/gb/xnorm

Citation

If you find this work or code is helpful in your research, please cite:

@inproceedings{yin2022x,
  title={X-Norm: Exchanging Normalization Parameters for Bimodal Fusion},
  author={Yin, Yufeng and Xu, Jiashu and Zu, Tianxin and Soleymani, Mohammad},
  booktitle={INTERNATIONAL CONFERENCE ON MULTIMODAL INTERACTION},
  pages={605--614},
  year={2022}
}

Reference

[1] Hazarika, Devamanyu, Roger Zimmermann, and Soujanya Poria. "Misa: Modality-invariant and-specific representations for multimodal sentiment analysis." Proceedings of the 28th ACM international conference on multimedia. 2020.

[2] Tsai, Yao-Hung Hubert, et al. "Multimodal transformer for unaligned multimodal language sequences." Proceedings of the conference. Association for Computational Linguistics. Meeting. Vol. 2019. NIH Public Access, 2019.

[3] Wang, Weiyao, Du Tran, and Matt Feiszli. "What makes training multi-modal classification networks hard?." Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition. 2020.