Description

This dataset contains 503 sponges belonging to the Demospongiae class collected from the Mediterranean (451 sponges) and Atlantic oceans (52 sponges). Each sponge is classified according to a hierarchy formed by: order, family, genus and specie. Each order is subdivided in several families. Each family is also divided in several genus, and each genus in several species: - There are 7 different orders (between 42 to 117 sponges per order) - 42 different families (1 to 43 sponges per family) - 114 different genus (1 to 34 sponges per genus) - 230 different species (1 to 15 sponges per specie) Although classification at all these levels can be attempted, it has traditionally been used as a classification dataset, using 'order' as the target class. Moreover, a subset consisting of 280 sponges (orders astrophoricda, axinellida and hadromerida) is also commonly used. The data set is relational and is provided in two alternative formats (which are equivalent): - NOOS: NOOS is a lisp-like language to represent data as feature-terms. The following files contain the dataset in this format: - sponge-ontology.noos: this defines the ontology (sorts and features) - sponge-dm.noos: this file defines the different constants used in the examples - sponge-cases-503.noos: this file contains the actual dataset - Horn Clauses: the dataset is also provided as a set of prolog clauses, equivalent to the feature-term representation in NOOS. The file sponges-503.pl contains the dataset in this format. Each predicate with head 'sponge-problem' defines a different sponge.

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