Most of the NLP tasks start with the basic challenge - how to find or detect something in the text. Whether you are designing a search engine, conversational interface or some sort of classificator you will likely start with a problem of how to detect named entities in the input text. These named entities can be universal such as dates, countries, cities as well as domain specific for your model. It is also important to note that we are talking about a class of NLP tasks where you actually know what you are looking for.
https://nlpcraft.apache.org/blogs/composable_named_entities.html
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