/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.io;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.table.AttributeFactory;
import com.rapidminer.example.table.DataRowFactory;
import com.rapidminer.example.table.MemoryExampleTable;
import com.rapidminer.example.table.SparseFormatDataRowReader;
import com.rapidminer.operator.IOObject;
import com.rapidminer.operator.Operator;
import com.rapidminer.operator.OperatorDescription;
import com.rapidminer.operator.OperatorException;
import com.rapidminer.operator.UserError;
import com.rapidminer.parameter.ParameterType;
import com.rapidminer.parameter.ParameterTypeCategory;
import com.rapidminer.parameter.ParameterTypeFile;
import com.rapidminer.parameter.ParameterTypeInt;
import com.rapidminer.parameter.ParameterTypeList;
import com.rapidminer.parameter.ParameterTypeString;
import com.rapidminer.tools.Ontology;
import com.rapidminer.tools.Tools;
import com.rapidminer.tools.att.AttributeSet;
/**
* Reads an example file in sparse format, i.e. lines have the form<br/>
* <center>
*
* <pre>
* label index:value index:value index:value...
* </pre>
*
* </center><br/> Index may be an integer (starting with 1) for the regular
* attributes or one of the prefixes specified by the parameter list
* <code>prefix_map</code>. Four possible <code>format</code>s are
* supported
* <dl>
* <dt>format_xy:</dt>
* <dd>The label is the last token in each line</dd>
* <dt>format_yx:</dt>
* <dd>The label is the first token in each line</dd>
* <dt>format_prefix:</dt>
* <dd>The label is prefixed by 'l:'</dd>
* <dt>format_separate_file:</dt>
* <dd>The label is read from a separate file specified by
* <code>label_file</code></dd>
* <dt>no_label:</dt>
* <dd>The example set is unlabeled.</dd>
* </dl>
* A detailed introduction to the sparse file format is given in section
* {@rapidminer.ref sec:sparse_format|First steps/File formats/Data files}.
*
* @see SparseFormatDataRowReader
*
* @author Ingo Mierswa, Simon Fischer
* @version $Id: SparseFormatExampleSource.java,v 1.13 2006/04/12 18:04:24
* ingomierswa Exp $
*/
public class SparseFormatExampleSource extends Operator {
/** The parameter name for "Format of the sparse data file." */
public static final String PARAMETER_FORMAT = "format";
/** The parameter name for "Name of the attribute description file." */
public static final String PARAMETER_ATTRIBUTE_DESCRIPTION_FILE = "attribute_description_file";
/** The parameter name for "Name of the data file. Only necessary if not specified in the attribute description file." */
public static final String PARAMETER_DATA_FILE = "data_file";
/** The parameter name for "Name of the data file containing the labels. Only necessary if format is 'format_separate_file'." */
public static final String PARAMETER_LABEL_FILE = "label_file";
/** The parameter name for "Dimension of the example space. Only necessary if parameter 'attribute_description_file' is not set." */
public static final String PARAMETER_DIMENSION = "dimension";
/** The parameter name for "The maximum number of examples to read from the data files (-1 = all)" */
public static final String PARAMETER_SAMPLE_SIZE = "sample_size";
/** The parameter name for "Determines, how the data is represented internally." */
public static final String PARAMETER_DATAMANAGEMENT = "datamanagement";
/** The parameter name for "Character that is used as decimal point." */
public static final String PARAMETER_DECIMAL_POINT_CHARACTER = "decimal_point_character";
/** The parameter name for "Maps prefixes to names of special attributes." */
public static final String PARAMETER_PREFIX_MAP = "prefix_map";
private static final Class[] INPUT_CLASSES = {};
private static final Class[] OUTPUT_CLASSES = { ExampleSet.class };
public SparseFormatExampleSource(OperatorDescription description) {
super(description);
}
public IOObject[] apply() throws OperatorException {
int format = getParameterAsInt(PARAMETER_FORMAT);
// +++++++++ special attribute prefix map +++++++++++++++
Map<String, String> prefixMap = new HashMap<String, String>();
Iterator p = getParameterList(PARAMETER_PREFIX_MAP).iterator();
while (p.hasNext()) {
Object[] prefixMapping = (Object[]) p.next();
prefixMap.put((String) prefixMapping[0], (String) prefixMapping[1]);
}
// +++++++++ attribute creation +++++++++++++++++++++++++
File dataFile = getParameterAsFile(PARAMETER_DATA_FILE);
File attributeDescriptionFile = getParameterAsFile(PARAMETER_ATTRIBUTE_DESCRIPTION_FILE);
AttributeSet attributeSet = null;
if (attributeDescriptionFile != null) {
try {
attributeSet = new AttributeSet(attributeDescriptionFile, false, this);
} catch (Throwable e) {
throw new UserError(this, e, 302, new Object[] { attributeDescriptionFile, e.getMessage() });
}
if ((dataFile != null) && (attributeSet.getDefaultSource() != null) && (!dataFile.equals(attributeSet.getDefaultSource()))) {
logWarning("Attribute file names specified by parameter 'data_file' and default_source specified in '" + attributeDescriptionFile + "' do not match! Assuming the latter to be correct.");
}
if ((format != SparseFormatDataRowReader.FORMAT_NO_LABEL) && (attributeSet.getSpecialAttribute("label") == null)) {
throw new UserError(this, 917, new Object[0]);
}
log("Found " + attributeSet.getNumberOfRegularAttributes() + " regular attributes.");
dataFile = attributeSet.getDefaultSource();
} else {
int dimension = getParameterAsInt(PARAMETER_DIMENSION);
if (dimension < 0)
throw new UserError(this, 921);
attributeSet = new AttributeSet(dimension);
for (int i = 0; i < dimension; i++) {
Attribute attribute = AttributeFactory.createAttribute(Ontology.REAL);
attributeSet.addAttribute(attribute);
}
p = prefixMap.values().iterator();
while (p.hasNext()) {
String specialName = (String) p.next();
attributeSet.setSpecialAttribute(specialName, AttributeFactory.createAttribute(Ontology.REAL));
}
if (format != SparseFormatDataRowReader.FORMAT_NO_LABEL) {
attributeSet.setSpecialAttribute("label", AttributeFactory.createAttribute(Ontology.NOMINAL));
}
}
if (dataFile == null) {
throw new UserError(this, 902, new Object[0]);
}
// +++++++++++++ reader +++++++++++++++++++++++++++++++++
Reader inData = null;
Reader inLabels = null;
try {
inData = Tools.getReader(dataFile, getEncoding());
} catch (IOException e) {
throw new UserError(this, e, 302, new Object[] { dataFile, e.getMessage() });
}
File labelFile = null;
if (format == SparseFormatDataRowReader.FORMAT_SEPARATE_FILE) {
labelFile = getParameterAsFile(PARAMETER_LABEL_FILE);
if (labelFile == null) {
throw new UserError(this, 201, new Object[] { "format", SparseFormatDataRowReader.FORMAT_NAMES[SparseFormatDataRowReader.FORMAT_SEPARATE_FILE], "label_file" });
}
try {
inLabels = Tools.getReader(labelFile, getEncoding());
} catch (IOException e) {
throw new UserError(this, e, 302, new Object[] { labelFile, e.getMessage() });
}
}
MemoryExampleTable table = new MemoryExampleTable(attributeSet.getAllAttributes());
SparseFormatDataRowReader reader = new SparseFormatDataRowReader(new DataRowFactory(getParameterAsInt(PARAMETER_DATAMANAGEMENT), getParameterAsString(PARAMETER_DECIMAL_POINT_CHARACTER).charAt(0)), format, prefixMap, attributeSet, inData, inLabels, getParameterAsInt(PARAMETER_SAMPLE_SIZE));
table.readExamples(reader);
ExampleSet exampleSet = table.createExampleSet(attributeSet);
return new IOObject[] { exampleSet };
}
public Class<?>[] getInputClasses() {
return INPUT_CLASSES;
}
public Class<?>[] getOutputClasses() {
return OUTPUT_CLASSES;
}
public List<ParameterType> getParameterTypes() {
List<ParameterType> types = super.getParameterTypes();
ParameterType type = new ParameterTypeCategory(PARAMETER_FORMAT, "Format of the sparse data file.", SparseFormatDataRowReader.FORMAT_NAMES, 0);
type.setExpert(false);
types.add(type);
type = new ParameterTypeFile(PARAMETER_ATTRIBUTE_DESCRIPTION_FILE, "Name of the attribute description file.", "aml", true);
type.setExpert(false);
types.add(type);
types.add(new ParameterTypeFile(PARAMETER_DATA_FILE, "Name of the data file. Only necessary if not specified in the attribute description file.", null, true));
types.add(new ParameterTypeFile(PARAMETER_LABEL_FILE, "Name of the data file containing the labels. Only necessary if format is 'format_separate_file'.", null, true));
types.add(new ParameterTypeInt(PARAMETER_DIMENSION, "Dimension of the example space. Only necessary if parameter 'attribute_description_file' is not set.", -1, Integer.MAX_VALUE, -1));
types.add(new ParameterTypeInt(PARAMETER_SAMPLE_SIZE, "The maximum number of examples to read from the data files (-1 = all)", -1, Integer.MAX_VALUE, -1));
types.add(new ParameterTypeCategory(PARAMETER_DATAMANAGEMENT, "Determines, how the data is represented internally.", DataRowFactory.TYPE_NAMES, DataRowFactory.TYPE_DOUBLE_ARRAY));
types.add(new ParameterTypeString(PARAMETER_DECIMAL_POINT_CHARACTER, "Character that is used as decimal point.", "."));
types.add(new ParameterTypeList(PARAMETER_PREFIX_MAP, "Maps prefixes to names of special attributes.", new ParameterTypeString("special_attribute", "Maps prefixes to names of special attributes.")));
return types;
}
}