Today, Amazon SageMaker Ground Truth launched built-in workflows for label verification and label adjustment. One way that ML practitioners have improved the accuracy of their labeled data is through using audit workflows. Audit workflows enable a group of reviewers to verify the accuracy of labels (a process called label verification) or adjust them (a process called label adjustment) if needed.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-sagemaker-ground-truth-adds-built-in-workflows-for-verification-and-adjustment-of-data-labels/