Values of string and nominal attributes are case sensitive, and any thatcontain space must be quoted, as follows:ĭates must be specified in the data section using the string representationspecified in the attribute declaration. Missing values are represented by a single question mark, as in: the datacorresponding to the nth declaration is always the nth fieldof the attribute). They must appearin the order that they were declared in the header section (i.e. The instance dataEach instance is represented on a single line, with carriage returnsdenoting the end of the instance.Īttribute values for each instance are delimited by commas. The DeclarationThe declaration is a single line denoting the start of the datasegment in the file. Dates must be specified in the data section as the corresponding stringrepresentations of the date/time (see example below).ĪRFF Data SectionThe ARFF Data section of the file contains the data declaration line and theactual instance lines. Thedefault format string accepts the ISO-8601 combined date and time format:'yyyy-MM-dd'T'HH:mm:ss'. Where is the name for the attribute and is an optional string specifying how date values should beparsed and printed (this is the same format used by SimpleDateFormat). The declarations are case insensitive.ĮxamplesSeveral well-known machine learning datasets are distributed with Weka inthe $WEKAHOME/data directory as ARFF files. The Data of the ARFF file looks like the following: An example headeron the standard IRIS dataset looks like this: The Header of the ARFF file contains the name of the relation, a listof the attributes (the columns in the data), and their types. The first section is the Headerinformation, which is followed the Data information. OverviewARFF files have two distinct sections. ARFF files weredeveloped by the Machine Learning Project at the Department of Computer Scienceof The University of Waikato for use with the Weka machine learning software. Library for reading and writing Weka attribute-relation file format (ARFF) files - chausner/ArffTools.An ARFF (Attribute-Relation File Format) file is an ASCII text file thatdescribes a list of instances sharing a set of attributes. If you're working in Weka, you have a built-in tool that will convert. This wikiHow teaches you how to convert a.CSV (comma-separated values) file to the.ARFF (attribute-relation file format) format.
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