Table 1. Classification of keywords according to their function. Own elaboration based on Scopus and Web of Science.

Keyword	Associated Tools	Applications	Characteristics
Machine Learning	Big Data Analytics	Restaurant Review	Leverage machine learning from user review data on the web and social networks for predictive modeling and decision making
		Restaurant reviews
		Information Extraction
		Sentiment Analysis
		Text mining
Restaurant automation	Deep Learning	Facial Recognition	Using deep learning techniques to program robotic waiters to assist diners, automate processes, and improve service times.
		Waiter robots
		Fast service in restaurant
IoT Architecture	Raspberry PI	Restaurant Industry	Use programmable devices and RFID technology to implement an IoT architecture to launch the smart restaurant, based on the provision of data in the cloud and the generation of predictive models.
	RFID
	Arduino
	Cloud Computing