Intelligent natural language processing services using cloud-based software technology to perform unsupervised topic clustering, relation extraction, named entity recognition and linking, single and multi-class classification, sentiment analysis, quote extraction, and semi-abstractive natural language summarization; providing computer programming services to customers that enable the customers' websites to process natural language queries, programmatically ingest any source of text, label text-based documents and build algorithms, and extract key information, generate insights, and perform analyses at scale through an application program interface (API)