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Due to the long time-lapse between the triggering and detection of a bug in the machine learning lifecycle, model developers favor data-centric logfile analysis over traditional interactive debugging techniques. But when useful execution data is missing from the logs after training, developers have little recourse beyond re-executing training with more logging statements, or guessing. In this paper, we present hindsight logging, a novel technique for efficiently querying ad-hoc execution data,arXiv:2006.07357v1 fatcat:fpwmpcjom5bj7e2axotgnoo5xu