Extracts the field value and converts it to a double.
Extracts the field value and converts it to a float.
Extracts the field value and emits it as a String.
An Extractor with special casing for loading the index from a Row.
Extracts the field value and converts it to a int.
Extracts a value from a single field to be placed in an
FieldExtractor.getMetadataName() values of "name"
and "weight" (case-sensitive) are special. In particular, "name" is used throughout the
environment to uniquely identify Examples within a
Dataset. "weight" should only
be used for the
FieldExtractor supplied to
weightExtractor which is used by the system to weight
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