What is the most efficient and fastest way to check data labelling quality ?

An approaches to improve the quality of labeled data is using audit workflows. Amazon SageMaker Ground Truth offers built-in workflow for label verification and label adjustment. You can chain an existing Amazon SageMaker Ground Truth labeling job to a verification or adjustment job to check data quality. Reference documentation : https://docs.aws.amazon.com/sagemaker/latest/dg/sms-verification-data.html