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Showing content from https://spark.apache.org/docs/latest/api/java/org/apache/spark/ml/classification/OneVsRest.html below:

OneVsRest (Spark 4.0.0 JavaDoc)

All Implemented Interfaces:

Serializable, org.apache.spark.internal.Logging, ClassifierParams, ClassifierTypeTrait, OneVsRestParams, Params, HasFeaturesCol, HasLabelCol, HasParallelism, HasPredictionCol, HasRawPredictionCol, HasWeightCol, PredictorParams, Identifiable, MLWritable

Reduction of Multiclass Classification to Binary Classification. Performs reduction using one against all strategy. For a multiclass classification with k classes, train k models (one per class). Each example is scored against all k models and the model with highest score is picked to label the example.

See Also:

• Serialized Form

• Nested Class Summary
  Nested classes/interfaces inherited from interface org.apache.spark.internal.Loggingorg.apache.spark.internal.Logging.LogStringContext, org.apache.spark.internal.Logging.SparkShellLoggingFilter

• Constructor Summary

  Constructors

• Method Summary

  param for the base binary classifier that we reduce multiclass classification into.

  Creates a copy of this instance with the same UID and some extra params.

  Param for features column name.

  Fits a model to the input data.

  Param for label column name.

  The number of threads to use when running parallel algorithms.

  Param for prediction column name.

  Param for raw prediction (a.k.a.

  The implementation of parallel one vs.

  Check transform validity and derive the output schema from the input schema.

  An immutable unique ID for the object and its derivatives.

  Param for weight column name.

  Returns an MLWriter instance for this ML instance.

  Methods inherited from interface org.apache.spark.internal.LogginginitializeForcefully, initializeLogIfNecessary, initializeLogIfNecessary, initializeLogIfNecessary$default$2, isTraceEnabled, log, logDebug, logDebug, logDebug, logDebug, logError, logError, logError, logError, logInfo, logInfo, logInfo, logInfo, logName, LogStringContext, logTrace, logTrace, logTrace, logTrace, logWarning, logWarning, logWarning, logWarning, org$apache$spark$internal$Logging$$log_, org$apache$spark$internal$Logging$$log__$eq, withLogContext
  Methods inherited from interface org.apache.spark.ml.util.MLWritablesave Methods inherited from interface org.apache.spark.ml.param.Paramsclear, copyValues, defaultCopy, defaultParamMap, explainParam, explainParams, extractParamMap, extractParamMap, get, getDefault, getOrDefault, getParam, hasDefault, hasParam, isDefined, isSet, onParamChange, paramMap, params, set, set, set, setDefault, setDefault, shouldOwn

• Constructor Details
  • OneVsRest
  • OneVsRest

    public OneVsRest()

• Method Details
  • read
  • load
  • parallelism

    Specified by:

    parallelism in interface HasParallelism

    Returns:

    (undocumented)

  • classifier

    param for the base binary classifier that we reduce multiclass classification into. The base classifier input and output columns are ignored in favor of the ones specified in

    OneVsRest

    .

    Specified by:

    classifier in interface OneVsRestParams

    Returns:

    (undocumented)

  • weightCol

    Param for weight column name. If this is not set or empty, we treat all instance weights as 1.0.

    Specified by:

    weightCol in interface HasWeightCol

    Returns:

    (undocumented)

  • rawPredictionCol

    Param for raw prediction (a.k.a. confidence) column name.

    Specified by:

    rawPredictionCol in interface HasRawPredictionCol

    Returns:

    (undocumented)

  • predictionCol

    Param for prediction column name.

    Specified by:

    predictionCol in interface HasPredictionCol

    Returns:

    (undocumented)

  • featuresCol

    Param for features column name.

    Specified by:

    featuresCol in interface HasFeaturesCol

    Returns:

    (undocumented)

  • labelCol

    Param for label column name.

    Specified by:

    labelCol in interface HasLabelCol

    Returns:

    (undocumented)

  • uid

    An immutable unique ID for the object and its derivatives.

    Specified by:

    uid in interface Identifiable

    Returns:

    (undocumented)

  • setClassifier
  • setLabelCol
  • setFeaturesCol
  • setPredictionCol
  • setRawPredictionCol
  • setParallelism

    Parameters:

    value - (undocumented)

    Returns:

    (undocumented)

  • setWeightCol

    Sets the value of param

    weightCol()

    .

    This is ignored if weight is not supported by classifier(). If this is not set or empty, we treat all instance weights as 1.0. Default is not set, so all instances have weight one.

    Parameters:

    value - (undocumented)

    Returns:

    (undocumented)

  • transformSchema

    Check transform validity and derive the output schema from the input schema.

    We check validity for interactions between parameters during transformSchema and raise an exception if any parameter value is invalid. Parameter value checks which do not depend on other parameters are handled by Param.validate().

    Typical implementation should first conduct verification on schema change and parameter validity, including complex parameter interaction checks.

    Specified by:

    transformSchema in class PipelineStage

    Parameters:

    schema - (undocumented)

    Returns:

    (undocumented)

  • fit

    Fits a model to the input data.

    Specified by:

    fit in class Estimator<OneVsRestModel>

    Parameters:

    dataset - (undocumented)

    Returns:

    (undocumented)

  • copy Description copied from interface: Params

    Creates a copy of this instance with the same UID and some extra params. Subclasses should implement this method and set the return type properly. See defaultCopy().

    Specified by:

    copy in interface Params

    Specified by:

    copy in class Estimator<OneVsRestModel>

    Parameters:

    extra - (undocumented)

    Returns:

    (undocumented)

  • write

    Returns an MLWriter instance for this ML instance.

    Specified by:

    write in interface MLWritable

    Returns:

    (undocumented)

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