Walrus supports the data reinjection of multiple sensors, multichannel sensors and multiple data types, featured with playing back the sensor data synchronously in multiple channels without changing the logic structure of the data, fully restoring the actual acquisition scene. Support playback of abnormal event data, frame-by-frame playback, and evaluation, scoring and positioning of scene reproduction with abnormal nodes. Mainly oriented to iterative algorithm of algorithm companies, the integrated positioning of OEMS and other scenarios.