If you are using the service, or dealing in depth with particular models, you are very welcome to cite the paper:
Carlos Badenes-Olmedo, Jose Luis Redondo-Garcia, and Oscar Corcho. 2017. Distributing Text Mining tasks with librAIry. In Proceedings of the 2017 ACM Symposium on Document Engineering (DocEng 17). ACM, New York, NY, USA, 63-66. [DOI][PDF]