Class/Object

org.apache.spark.ml.feature

HashingTF

Related Docs: object HashingTF | package feature

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class HashingTF extends Transformer with HasInputCol with HasOutputCol with DefaultParamsWritable

Maps a sequence of terms to their term frequencies using the hashing trick. Currently we use Austin Appleby's MurmurHash 3 algorithm (MurmurHash3_x86_32) to calculate the hash code value for the term object. Since a simple modulo is used to transform the hash function to a column index, it is advisable to use a power of two as the numFeatures parameter; otherwise the features will not be mapped evenly to the columns.

Annotations
@Since( "1.2.0" )
Source
HashingTF.scala
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Inherited
  1. HashingTF
  2. DefaultParamsWritable
  3. MLWritable
  4. HasOutputCol
  5. HasInputCol
  6. Transformer
  7. PipelineStage
  8. Logging
  9. Params
  10. Serializable
  11. Serializable
  12. Identifiable
  13. AnyRef
  14. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new HashingTF()

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    Annotations
    @Since( "1.2.0" )
  2. new HashingTF(uid: String)

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    Annotations
    @Since( "1.4.0" )

Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
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  2. final def ##(): Int

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  3. final def $[T](param: Param[T]): T

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    An alias for getOrDefault().

    An alias for getOrDefault().

    Attributes
    protected
    Definition Classes
    Params
  4. final def ==(arg0: Any): Boolean

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  5. final def asInstanceOf[T0]: T0

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    Any
  6. val binary: BooleanParam

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    Binary toggle to control term frequency counts.

    Binary toggle to control term frequency counts. If true, all non-zero counts are set to 1. This is useful for discrete probabilistic models that model binary events rather than integer counts. (default = false)

    Annotations
    @Since( "2.0.0" )
  7. final def clear(param: Param[_]): HashingTF.this.type

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    Clears the user-supplied value for the input param.

    Clears the user-supplied value for the input param.

    Definition Classes
    Params
  8. def clone(): AnyRef

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    Attributes
    protected[java.lang]
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    AnyRef
    Annotations
    @throws( ... )
  9. def copy(extra: ParamMap): HashingTF

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

    Definition Classes
    HashingTFTransformerPipelineStageParams
    Annotations
    @Since( "1.4.1" )
  10. def copyValues[T <: Params](to: T, extra: ParamMap = ParamMap.empty): T

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    Copies param values from this instance to another instance for params shared by them.

    Copies param values from this instance to another instance for params shared by them.

    This handles default Params and explicitly set Params separately. Default Params are copied from and to defaultParamMap, and explicitly set Params are copied from and to paramMap. Warning: This implicitly assumes that this Params instance and the target instance share the same set of default Params.

    to

    the target instance, which should work with the same set of default Params as this source instance

    extra

    extra params to be copied to the target's paramMap

    returns

    the target instance with param values copied

    Attributes
    protected
    Definition Classes
    Params
  11. final def defaultCopy[T <: Params](extra: ParamMap): T

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    Default implementation of copy with extra params.

    Default implementation of copy with extra params. It tries to create a new instance with the same UID. Then it copies the embedded and extra parameters over and returns the new instance.

    Attributes
    protected
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    Params
  12. final def eq(arg0: AnyRef): Boolean

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  13. def equals(arg0: Any): Boolean

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  14. def explainParam(param: Param[_]): String

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    Explains a param.

    Explains a param.

    param

    input param, must belong to this instance.

    returns

    a string that contains the input param name, doc, and optionally its default value and the user-supplied value

    Definition Classes
    Params
  15. def explainParams(): String

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    Explains all params of this instance.

    Explains all params of this instance. See explainParam().

    Definition Classes
    Params
  16. final def extractParamMap(): ParamMap

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    extractParamMap with no extra values.

    extractParamMap with no extra values.

    Definition Classes
    Params
  17. final def extractParamMap(extra: ParamMap): ParamMap

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    Extracts the embedded default param values and user-supplied values, and then merges them with extra values from input into a flat param map, where the latter value is used if there exist conflicts, i.e., with ordering: default param values less than user-supplied values less than extra.

    Extracts the embedded default param values and user-supplied values, and then merges them with extra values from input into a flat param map, where the latter value is used if there exist conflicts, i.e., with ordering: default param values less than user-supplied values less than extra.

    Definition Classes
    Params
  18. def finalize(): Unit

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    protected[java.lang]
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    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  19. final def get[T](param: Param[T]): Option[T]

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    Optionally returns the user-supplied value of a param.

    Optionally returns the user-supplied value of a param.

    Definition Classes
    Params
  20. def getBinary: Boolean

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    Annotations
    @Since( "2.0.0" )
  21. final def getClass(): Class[_]

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  22. final def getDefault[T](param: Param[T]): Option[T]

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    Gets the default value of a parameter.

    Gets the default value of a parameter.

    Definition Classes
    Params
  23. final def getInputCol: String

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    Definition Classes
    HasInputCol
  24. def getNumFeatures: Int

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    Annotations
    @Since( "1.2.0" )
  25. final def getOrDefault[T](param: Param[T]): T

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    Gets the value of a param in the embedded param map or its default value.

    Gets the value of a param in the embedded param map or its default value. Throws an exception if neither is set.

    Definition Classes
    Params
  26. final def getOutputCol: String

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    Definition Classes
    HasOutputCol
  27. def getParam(paramName: String): Param[Any]

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    Gets a param by its name.

    Gets a param by its name.

    Definition Classes
    Params
  28. final def hasDefault[T](param: Param[T]): Boolean

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    Tests whether the input param has a default value set.

    Tests whether the input param has a default value set.

    Definition Classes
    Params
  29. def hasParam(paramName: String): Boolean

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    Tests whether this instance contains a param with a given name.

    Tests whether this instance contains a param with a given name.

    Definition Classes
    Params
  30. def hashCode(): Int

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    Definition Classes
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  31. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean = false): Boolean

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    Attributes
    protected
    Definition Classes
    Logging
  32. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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    protected
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    Logging
  33. final val inputCol: Param[String]

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    Param for input column name.

    Param for input column name.

    Definition Classes
    HasInputCol
  34. final def isDefined(param: Param[_]): Boolean

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    Checks whether a param is explicitly set or has a default value.

    Checks whether a param is explicitly set or has a default value.

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    Params
  35. final def isInstanceOf[T0]: Boolean

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    Any
  36. final def isSet(param: Param[_]): Boolean

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    Checks whether a param is explicitly set.

    Checks whether a param is explicitly set.

    Definition Classes
    Params
  37. def isTraceEnabled(): Boolean

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    Logging
  38. def log: Logger

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    Logging
  39. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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    Logging
  40. def logDebug(msg: ⇒ String): Unit

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    Logging
  41. def logError(msg: ⇒ String, throwable: Throwable): Unit

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    Logging
  42. def logError(msg: ⇒ String): Unit

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    Logging
  43. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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    Logging
  44. def logInfo(msg: ⇒ String): Unit

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    Logging
  45. def logName: String

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    Logging
  46. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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    Logging
  47. def logTrace(msg: ⇒ String): Unit

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    protected
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    Logging
  48. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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    Logging
  49. def logWarning(msg: ⇒ String): Unit

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    protected
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    Logging
  50. final def ne(arg0: AnyRef): Boolean

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    AnyRef
  51. final def notify(): Unit

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  52. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  53. val numFeatures: IntParam

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    Number of features.

    Number of features. Should be greater than 0. (default = 218)

    Annotations
    @Since( "1.2.0" )
  54. final val outputCol: Param[String]

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    Param for output column name.

    Param for output column name.

    Definition Classes
    HasOutputCol
  55. lazy val params: Array[Param[_]]

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    Returns all params sorted by their names.

    Returns all params sorted by their names. The default implementation uses Java reflection to list all public methods that have no arguments and return Param.

    Definition Classes
    Params
    Note

    Developer should not use this method in constructor because we cannot guarantee that this variable gets initialized before other params.

  56. def save(path: String): Unit

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    Saves this ML instance to the input path, a shortcut of write.save(path).

    Saves this ML instance to the input path, a shortcut of write.save(path).

    Definition Classes
    MLWritable
    Annotations
    @Since( "1.6.0" ) @throws( ... )
  57. final def set(paramPair: ParamPair[_]): HashingTF.this.type

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    Sets a parameter in the embedded param map.

    Sets a parameter in the embedded param map.

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    protected
    Definition Classes
    Params
  58. final def set(param: String, value: Any): HashingTF.this.type

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    Sets a parameter (by name) in the embedded param map.

    Sets a parameter (by name) in the embedded param map.

    Attributes
    protected
    Definition Classes
    Params
  59. final def set[T](param: Param[T], value: T): HashingTF.this.type

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    Sets a parameter in the embedded param map.

    Sets a parameter in the embedded param map.

    Definition Classes
    Params
  60. def setBinary(value: Boolean): HashingTF.this.type

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    Annotations
    @Since( "2.0.0" )
  61. final def setDefault(paramPairs: ParamPair[_]*): HashingTF.this.type

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    Sets default values for a list of params.

    Sets default values for a list of params.

    Note: Java developers should use the single-parameter setDefault. Annotating this with varargs can cause compilation failures due to a Scala compiler bug. See SPARK-9268.

    paramPairs

    a list of param pairs that specify params and their default values to set respectively. Make sure that the params are initialized before this method gets called.

    Attributes
    protected
    Definition Classes
    Params
  62. final def setDefault[T](param: Param[T], value: T): HashingTF.this.type

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    Sets a default value for a param.

    Sets a default value for a param.

    param

    param to set the default value. Make sure that this param is initialized before this method gets called.

    value

    the default value

    Attributes
    protected
    Definition Classes
    Params
  63. def setInputCol(value: String): HashingTF.this.type

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    Annotations
    @Since( "1.4.0" )
  64. def setNumFeatures(value: Int): HashingTF.this.type

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    Annotations
    @Since( "1.2.0" )
  65. def setOutputCol(value: String): HashingTF.this.type

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    Annotations
    @Since( "1.4.0" )
  66. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  67. def toString(): String

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    Definition Classes
    Identifiable → AnyRef → Any
  68. def transform(dataset: Dataset[_]): DataFrame

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    Transforms the input dataset.

    Transforms the input dataset.

    Definition Classes
    HashingTFTransformer
    Annotations
    @Since( "2.0.0" )
  69. def transform(dataset: Dataset[_], paramMap: ParamMap): DataFrame

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    Transforms the dataset with provided parameter map as additional parameters.

    Transforms the dataset with provided parameter map as additional parameters.

    dataset

    input dataset

    paramMap

    additional parameters, overwrite embedded params

    returns

    transformed dataset

    Definition Classes
    Transformer
    Annotations
    @Since( "2.0.0" )
  70. def transform(dataset: Dataset[_], firstParamPair: ParamPair[_], otherParamPairs: ParamPair[_]*): DataFrame

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    Transforms the dataset with optional parameters

    Transforms the dataset with optional parameters

    dataset

    input dataset

    firstParamPair

    the first param pair, overwrite embedded params

    otherParamPairs

    other param pairs, overwrite embedded params

    returns

    transformed dataset

    Definition Classes
    Transformer
    Annotations
    @Since( "2.0.0" ) @varargs()
  71. def transformSchema(schema: StructType): StructType

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    :: DeveloperApi ::

    :: DeveloperApi ::

    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.

    Definition Classes
    HashingTFPipelineStage
    Annotations
    @Since( "1.4.0" )
  72. def transformSchema(schema: StructType, logging: Boolean): StructType

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    :: DeveloperApi ::

    :: DeveloperApi ::

    Derives the output schema from the input schema and parameters, optionally with logging.

    This should be optimistic. If it is unclear whether the schema will be valid, then it should be assumed valid until proven otherwise.

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    PipelineStage
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    @DeveloperApi()
  73. val uid: String

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    An immutable unique ID for the object and its derivatives.

    An immutable unique ID for the object and its derivatives.

    Definition Classes
    HashingTFIdentifiable
    Annotations
    @Since( "1.4.0" )
  74. final def wait(): Unit

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    AnyRef
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    @throws( ... )
  75. final def wait(arg0: Long, arg1: Int): Unit

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    @throws( ... )
  76. final def wait(arg0: Long): Unit

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    AnyRef
    Annotations
    @throws( ... )
  77. def write: MLWriter

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    Returns an MLWriter instance for this ML instance.

    Returns an MLWriter instance for this ML instance.

    Definition Classes
    DefaultParamsWritableMLWritable

Inherited from DefaultParamsWritable

Inherited from MLWritable

Inherited from HasOutputCol

Inherited from HasInputCol

Inherited from Transformer

Inherited from PipelineStage

Inherited from Logging

Inherited from Params

Inherited from Serializable

Inherited from Serializable

Inherited from Identifiable

Inherited from AnyRef

Inherited from Any

Parameters

A list of (hyper-)parameter keys this algorithm can take. Users can set and get the parameter values through setters and getters, respectively.

Members

Parameter setters

Parameter getters