Amazon Personalize now makes it easier than ever to remove users from your datasets with a new deletion API. Amazon Personalize uses datasets provided by customers to train custom personalization models on their behalf. This new capability allows you to delete records about users from your datasets including user metadata and user interactions. This helps to maintain data for your compliance programs and keep your data current as your user base changes. Once the deletion is complete, Personalize will no longer store information about the deleted users and therefore will not consider the user for model training.
Source:: Amazon AWS