Nymeria: A Massive Collection of Multimodal Egocentric Daily Motion in the Wild

We introduce Nymeria - a large-scale, diverse, richly annotated human motion dataset collected in the wild with multiple multimodal egocentric devices. The dataset comes with a) full-body ground-truth motion; b) multiple multimodal egocentric data from Project Aria devices with videos, eye tracking, IMUs and etc.; and c) an third-person perspective by an additional "observer". All devices are precisely synchronized and localized in one metric 3D world. We derive hierarchical protocol to add in-context language descriptions of human motion, from fine-grain motion narrations, to simplified atomic actions and high-level activity summarization. To the best of our knowledge, Nymeria dataset is the world's largest human motion in the wild; first of its kind to provide synchronized and localized multi-device multimodal egocentric data; and the world's largest motion-language dataset. It provides 300 hours of daily activities from 264 participants across 50 locations, total travelling distance over 399 Km. The language descriptions contain 310.5K sentences in 8.64M words from a vocabulary size of 6545. To demonstrate the potential of the dataset we evaluate several SOTA algorithms for egocentric body tracking, motion synthesis, and action recognition.