Each input corresponds to a single attribute. For example, if the problem is to
decide on approval or disapproval of a loan, some attributes could be the applicant’s
income level, age, and home ownership. The numeric value, or representation, of an
attribute is the input to the network. Several types of data, such as text, pictures, and
voice, can be used as inputs. Preprocessing may be needed to convert the data to meaningful
inputs from symbolic data or to scale the data.