给定一组文本，找到其中的关键词并列出它们的频率。
"Natural language processing is a branch of artificial intelligence that deals with the interaction between computers and humans using natural language."
关键词：Natural language processing, artificial intelligence, interaction, computers, humans, natural language

频率：Natural language processing (1), artificial intelligence (1), interaction (1), computers (1), humans (1), natural language (1)