smile.data.parser

Class ArffParser

java.lang.Object

smile.data.parser.ArffParser

public class ArffParser
extends Object

Weka ARFF (attribute relation file format) file parser. ARFF is an ASCII text file format that is essentially a CSV file with a header that describes the meta-data. ARFF was developed for use in the Weka machine learning software.

A dataset is firstly described, beginning with the name of the dataset (or the relation in ARFF terminology). Each of the variables (or attribute in ARFF terminology) used to describe the observations is then identified, together with their data type, each definition on a single line. The actual observations are then listed, each on a single line, with fields separated by commas, much like a CSV file.

Missing values in an ARFF dataset are identified using the question mark '?'.

Comments can be included in the file, introduced at the beginning of a line with a '%', whereby the remainder of the line is ignored.

A significant advantage of the ARFF data file over the CSV data file is the meta data information.

Also, the ability to include comments ensure we can record extra information about the data set, including how it was derived, where it came from, and how it might be cited.

Author:

Haifeng Li

Constructor Summary

Constructors

Constructor and Description
ArffParser() Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
static Attribute[]	getAttributes(File file) Returns the attribute set of given file.
static Attribute[]	getAttributes(InputStream stream) Returns the attribute set of given stream.
static Attribute[]	getAttributes(String path) Returns the attribute set of given file.
static Attribute[]	getAttributes(URI uri) Returns the attribute set of given URI.
int	getResponseIndex() Returns the column index (starting at 0) of dependent/response variable.
AttributeDataset	parse(File file) Parse a dataset from given file.
AttributeDataset	parse(InputStream stream) Parse a dataset from given stream.
AttributeDataset	parse(String path) Parse a dataset from given file.
AttributeDataset	parse(URI uri) Parse a dataset from given URI.
void	setResponseIndex(int index) Sets the column index (starting at 0) of dependent/response variable.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ArffParser

public ArffParser()

Constructor.

Method Detail

getResponseIndex

public int getResponseIndex()

Returns the column index (starting at 0) of dependent/response variable.

setResponseIndex

public void setResponseIndex(int index)

Sets the column index (starting at 0) of dependent/response variable.

getAttributes

public static Attribute[] getAttributes(URI uri)
                                 throws FileNotFoundException,
                                        IOException,
                                        ParseException

Returns the attribute set of given URI.

Throws:

FileNotFoundException

IOException

ParseException

getAttributes

public static Attribute[] getAttributes(String path)
                                 throws FileNotFoundException,
                                        IOException,
                                        ParseException

Returns the attribute set of given file.

Throws:

FileNotFoundException

IOException

ParseException

getAttributes

public static Attribute[] getAttributes(File file)
                                 throws FileNotFoundException,
                                        IOException,
                                        ParseException

Returns the attribute set of given file.

Throws:

FileNotFoundException

IOException

ParseException

getAttributes

public static Attribute[] getAttributes(InputStream stream)
                                 throws IOException,
                                        ParseException

Returns the attribute set of given stream.

Throws:

IOException

ParseException

parse

public AttributeDataset parse(URI uri)
                       throws FileNotFoundException,
                              IOException,
                              ParseException

Parse a dataset from given URI.

Throws:

FileNotFoundException

IOException

ParseException

parse

public AttributeDataset parse(String path)
                       throws FileNotFoundException,
                              IOException,
                              ParseException

Parse a dataset from given file.

Throws:

FileNotFoundException

IOException

ParseException

parse

public AttributeDataset parse(File file)
                       throws FileNotFoundException,
                              IOException,
                              ParseException

Parse a dataset from given file.

Throws:

FileNotFoundException

IOException

ParseException

parse

public AttributeDataset parse(InputStream stream)
                       throws IOException,
                              ParseException

Parse a dataset from given stream.

Throws:

IOException

ParseException