I've started using the alchemy API but I would like to know if there is any scientific publication that explains the models used for extracting the keywords and the concepts from the text?
Also according to this answer Is there way to influence AlchemyAPI sentiment analysis the models used for the alchemy Api were trained on billions of web pages. My question is on which type of data the algorithms were trained on (only news content for example?).
Thank you in advance for the answers.