Hello, It looks like that some of your entity have less then 100 examples and when you add more examples you reached maximum supported samples limit. You should analyze your text to understand how may examples you have for each entity. Then you could reduce number of examples for entities with high number of examples and add more for those entities which have less then 100.
Amazon Comprehend team has updated the custom NER annotation limitation, from minimum 100 annotation per entity type to 25 annotations per entity type. Check: Amazon Comprehend announces lower annotation limits for custom entity recognition for more information.
For the better accuracy, when preparing the training data, make sure you have balanced annotation numbers across entity types and followed Amazon Comprehend Guidelines.
Want Real-Time Custom Entity Recognition for PDFs Amazon Comprehend
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