Ordinal Triplet Loss: Investigating Sleepiness Detection from Speech

In this paper we present our submission to the INTERSPEECH 2019 ComParE Sleepiness challenge. By nature, the given speech dataset is an archetype of one with relatively limited samples, a complex underlying data distribution, and subjective ordinal labels. We propose a novel approach termed ordinal triplet loss (OTL) that can be readily added to any deep architecture in order to address the above data constraints. Ordinal triplet loss implicitly maps inputs into a space where similar samples are closer to each other than different ones. We demonstrate the efficacy of our approach on the aforementioned task.(1)