DANA: Dimension-Adaptive Neural Architecture for Multivariate Sensor Data

TL;DR

This paper introduces DANA, a neural architecture that adapts to varying sensor data dimensions, maintaining high accuracy and efficiency in sensor data classification despite changes in sensor availability and sampling rates.

Contribution

The paper proposes a novel dimension-adaptive pooling layer and training procedure, enabling neural networks to handle variable input dimensions without accuracy loss or extra computation.

Findings

DANA maintains high classification accuracy across different sensor data dimensions.

It outperforms existing methods in robustness to sensor availability and sampling rate changes.

Experiments on real-world and synthetic datasets validate its effectiveness.

Abstract

Motion sensors embedded in wearable and mobile devices allow for dynamic selection of sensor streams and sampling rates, enabling several applications, such as power management and data-sharing control. While deep neural networks (DNNs) achieve competitive accuracy in sensor data classification, DNNs generally process incoming data from a fixed set of sensors with a fixed sampling rate, and changes in the dimensions of their inputs cause considerable accuracy loss, unnecessary computations, or failure in operation. We introduce a dimension-adaptive pooling (DAP) layer that makes DNNs flexible and more robust to changes in sensor availability and in sampling rate. DAP operates on convolutional filter maps of variable dimensions and produces an input of fixed dimensions suitable for feedforward and recurrent layers. We also propose a dimension-adaptive training (DAT) procedure for enabling DNNs that use DAP to better generalize over the set of feasible data dimensions at inference time. DAT comprises the random selection of dimensions during the forward passes and optimization with accumulated gradients of several backward passes. Combining DAP and DAT, we show how to transform non-adaptive DNNs into a Dimension-Adaptive Neural Architecture (DANA), while keeping the same number of parameters. Compared to existing approaches, our solution provides better classification accuracy over the range of possible data dimensions at inference time and does not require up-sampling or imputation, thus reducing unnecessary computations. Experiments on seven datasets (four benchmark real-world datasets for human activity recognition and three synthetic datasets) show that DANA prevents significant losses in classification accuracy of the state-of-the-art DNNs and, compared to baselines, it better captures correlated patterns in sensor data under dynamic sensor availability and varying sampling rates.