org.tribuo.data.columnar.extractors

Class IndexExtractor

java.lang.Object

org.tribuo.data.columnar.extractors.IndexExtractor

All Implemented Interfaces:

com.oracle.labs.mlrg.olcut.config.Configurable, com.oracle.labs.mlrg.olcut.provenance.Provenancable<com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance>, FieldExtractor<Long>

public class IndexExtractor
extends Object
implements FieldExtractor<Long>

An Extractor with special casing for loading the index from a Row. The index is written out as a Long.

This is the row wise count, i.e., the number of examples that the data source has processed, rather than anything extracted from the data.

Constructor Summary

Constructors

Constructor and Description
IndexExtractor() Extracts the index writing to the default metadata field name Example.NAME.
IndexExtractor(String metadataName) Extracts the index, writing to the supplied metadata field name.

Method Summary

Modifier and Type	Method and Description
Optional<Long>	extract(ColumnarIterator.Row row) Returns Optional which is filled if extraction succeeded.
String	getMetadataName() Gets the metadata key name.
com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance	getProvenance()
Class<Long>	getValueType() Gets the class of the value produced by this extractor.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.labs.mlrg.olcut.config.Configurable

postConfig

Constructor Detail

IndexExtractor

public IndexExtractor(String metadataName)

Extracts the index, writing to the supplied metadata field name.

Parameters:

metadataName - The metadata field to write to.

IndexExtractor

public IndexExtractor()

Extracts the index writing to the default metadata field name Example.NAME.

Method Detail

getMetadataName

public String getMetadataName()

Description copied from interface: FieldExtractor

Gets the metadata key name. This is the key into which this value will be written in an Example if it is given to RowProcessor.

Specified by:

getMetadataName in interface FieldExtractor<Long>

Returns:

The metadata key name.

getValueType

public Class<Long> getValueType()

Description copied from interface: FieldExtractor

Gets the class of the value produced by this extractor.

Specified by:

getValueType in interface FieldExtractor<Long>

Returns:

The class of the value.

extract

public Optional<Long> extract(ColumnarIterator.Row row)

Description copied from interface: FieldExtractor

Returns Optional which is filled if extraction succeeded.

Specified by:

extract in interface FieldExtractor<Long>

Parameters:

row - The raw row from which to extract a value

Returns:

A value.

getProvenance

public com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance getProvenance()

Specified by:

getProvenance in interface com.oracle.labs.mlrg.olcut.provenance.Provenancable<com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance>