# An X3D Neural Network Analysis for Runner's Performance Assessment in a Wild Sporting Environment Source: [An X3D Neural Network Analysis for Runner's Performance Assessment in a Wild Sporting Environment]() Collection index: [llms.txt]() Data updated: 2025-10-26T01:41:08.783Z Authors: David Freire-Obreg\\'on, Javier Lorenzo-Navarro, Oliverio J. Santana, Daniel Hern\\'andez-Sosa, Modesto Castrill\\'on-Santana Published: 2023-07-22T23:15:47.000Z ## Abstract We present a transfer learning analysis on a sporting environment of the expanded 3D (X3D) neural networks. Inspired by action quality assessment methods in the literature, our method uses an action recognition network to estimate athletes' cumulative race time (CRT) during an ultra-distance competition. We evaluate the performance considering the X3D, a family of action recognition networks that expand a small 2D image classification architecture along multiple network axes, including space, time, width, and depth. We demonstrate that the resulting neural network can provide remarkable performance for short input footage, with a mean absolute error of 12 minutes and a half when estimating the CRT for runners who have been active from 8 to 20 hours. Our most significant discovery is that X3D achieves state-of-the-art performance while requiring almost seven times less memory to achieve better precision than previous work. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()