Not simple NER
https://towardsdatascience.com/deep-learning-for-ner-1-public-datasets-and-annotation-methods-8b1ad5e98caf
https://towardsdatascience.com/deep-learning-for-named-entity-recognition-2-implementing-the-state-of-the-art-bidirectional-lstm-4603491087f1
https://towardsdatascience.com/deep-learning-for-named-entity-recognition-3-reusing-a-bidirectional-lstm-cnn-on-clinical-text-e84bd28052df
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