Amazon Comprehend is a managed AI service that uses natural language processing (NLP) with ready-made intelligence to extract insights about the content of documents. It develops insights by recognizing the entities, key phrases, language, sentiments, and other common elements in a document. The ability to train custom models through the Custom classification and Custom entity recognition features of Comprehend has enabled customers to explore out-of-the-box NLP capabilities tied to their requirements without having to take the approach of building classification and entity recognition models from scratch.
Today, users invest a significant amount of resources to build, train, and maintain custom models. However, these models are sensitive to changes in the real world. For example, since 2020, COVID has become a new entity type that businesses need to extract from documents. In order to do so, customers have to retrain their existing entity extraction models with new training data that includes

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