Collaborative Filtering Is Usually Done by Building a User-Item Ratings

question 31

Short Answer

Collaborative filtering is usually done by building a user-item ratings matrix where each row represents a unique user and each column gives the individual item rating made by the user. The resultant matrix is a dynamic, sparse matrix with a huge ________.

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Definitions:

Instinctive Behavior

Instinctive behavior is an innate, unlearned response pattern exhibited by an organism when presented with certain stimuli.

Epinephrine

A hormone and neurotransmitter also known as adrenaline, involved in the body's fight-or-flight response.

Vasopressin

A hormone produced by the hypothalamus and stored in the pituitary gland that regulates water balance in the body by reducing urine production; also known as antidiuretic hormone.

Prolactin

A hormone produced by the anterior pituitary gland that stimulates milk production after childbirth.