public class FeatureHasher extends Object implements Transformer<FeatureHasher>, FeatureHasherParams<FeatureHasher>
If multiple features are projected into the same column, the output values are accumulated. For the hashing trick, see https://en.wikipedia.org/wiki/Feature_hashing for details.
INPUT_COLS
OUTPUT_COL
CATEGORICAL_COLS
NUM_FEATURES
Constructor and Description |
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FeatureHasher() |
Modifier and Type | Method and Description |
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Map<Param<?>,Object> |
getParamMap()
Returns a map which should contain value for every parameter that meets one of the following
conditions.
|
static FeatureHasher |
load(org.apache.flink.table.api.bridge.java.StreamTableEnvironment env,
String path) |
void |
save(String path)
Saves the metadata and bounded data of this stage to the given path.
|
org.apache.flink.table.api.Table[] |
transform(org.apache.flink.table.api.Table... inputs)
Applies the AlgoOperator on the given input tables and returns the result tables.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
get, getParam, set
getInputCols, setInputCols
getOutputCol, setOutputCol
getCategoricalCols, setCategoricalCols
getNumFeatures, setNumFeatures
public org.apache.flink.table.api.Table[] transform(org.apache.flink.table.api.Table... inputs)
AlgoOperator
transform
in interface AlgoOperator<FeatureHasher>
inputs
- a list of tablespublic void save(String path) throws IOException
Stage
save
in interface Stage<FeatureHasher>
IOException
public static FeatureHasher load(org.apache.flink.table.api.bridge.java.StreamTableEnvironment env, String path) throws IOException
IOException
public Map<Param<?>,Object> getParamMap()
WithParams
1) set(...) has been called to set value for this parameter.
2) The parameter is a public final field of this WithParams instance. This includes fields inherited from its interfaces and super-classes.
The subclass which implements this interface could meet this requirement by returning a
member field of the given map type, after having initialized this member field using the
ParamUtils.initializeMapWithDefaultValues(Map, WithParams)
method.
getParamMap
in interface WithParams<FeatureHasher>
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