Concepts inCollaborative filtering with temporal dynamics

Collaborative filtering

Collaborative filtering (CF) is a technique used by some recommender systems. Collaborative filtering has two senses, a narrow one and a more general one. In general, collaborative filtering is the process of filtering for information or patterns using techniques involving collaboration among multiple agents, viewpoints, data sources, etc. Applications of collaborative filtering typically involve very large data sets.  more from Wikipedia

Netflix

Netflix, Inc. is an American provider of on-demand Internet streaming media in the United States, Canada, Latin America, the Caribbean, United Kingdom and Ireland and flat rate DVD-by-mail in the United States. The company was established in 1997 and is headquartered in Los Gatos, California. It started its subscription-based digital distribution service in 1999 and by 2009 it was offering a collection of 100,000 titles on DVD and had surpassed 10 million subscribers.  more from Wikipedia

Recommender system

Recommender systems or recommendation systems (sometimes replacing "system" with a synonym such as platform or engine) are a subclass of information filtering system that seek to predict the 'rating' or 'preference' that a user would give to an item or social element they had not yet considered, using a model built from the characteristics of an item (content-based approaches) or the user's social environment (collaborative filtering approaches).  more from Wikipedia

Conceptual model

In the most general sense, a model is anything used in any way to represent anything else. Some models are physical objects, for instance, a toy model which may be assembled, and may even be made to work like the object it represents. They are used to help us know and understand the subject matter they represent. The term conceptual model may be used to refer to models which are represented by concepts or related concepts which are formed after a conceptualization process in the mind.  more from Wikipedia

Ecosystem

An ecosystem is a biological system consisting of all the living organisms or biotic components in a particular area and the nonliving or abiotic components with which the organisms interact, such as air, mineral soil, water, and sunlight. Key processes in ecosystems include the capture of light energy and carbon through photosynthesis, the transfer of carbon and energy through food webs, and the release of nutrients and carbon through decomposition.  more from Wikipedia