AttributeGroup (Spark 2.0.0 JavaDoc)

Object
- org.apache.spark.ml.attribute.AttributeGroup

All Implemented Interfaces:

java.io.Serializable
```
public class AttributeGroup
extends Object
implements scala.Serializable
```
:: DeveloperApi :: Attributes that describe a vector ML column.
param: name name of the attribute group (the ML column name) param: numAttributes optional number of attributes. At most one of numAttributes and attrs can be defined. param: attrs optional array of attributes. Attribute will be copied with their corresponding indices in the array.

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description
`AttributeGroup(String name)` Creates an attribute group without attribute info.
`AttributeGroup(String name, Attribute[] attrs)` Creates an attribute group with attributes.
`AttributeGroup(String name, int numAttributes)` Creates an attribute group knowing only the number of attributes.

Method Summary

Methods
Modifier and Type	Method and Description
`Attribute`	`apply(int attrIndex)` Gets an attribute by its index.
`Attribute`	`apply(String attrName)` Gets an attribute by its name.
`scala.Option<Attribute[]>`	`attributes()` Optional array of attributes.
`boolean`	`equals(Object other)`
`static AttributeGroup`	`fromStructField(StructField field)` Creates an attribute group from a `StructField` instance.
`Attribute`	`getAttr(int attrIndex)` Gets an attribute by its index.
`Attribute`	`getAttr(String attrName)` Gets an attribute by its name.
`boolean`	`hasAttr(String attrName)` Test whether this attribute group contains a specific attribute.
`int`	`hashCode()`
`int`	`indexOf(String attrName)` Index of an attribute specified by name.
`String`	`name()`
`scala.Option<Object>`	`numAttributes()`
`int`	`size()` Size of the attribute group.
`Metadata`	`toMetadata()` Converts to ML metadata
`Metadata`	`toMetadata(Metadata existingMetadata)` Converts to ML metadata with some existing metadata.
`String`	`toString()`
`StructField`	`toStructField()` Converts to a StructField.
`StructField`	`toStructField(Metadata existingMetadata)` Converts to a StructField with some existing metadata.

Methods inherited from class Object
getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - AttributeGroup
```
public AttributeGroup(String name)
```
    Creates an attribute group without attribute info.
    
    Parameters:
    name - name of the attribute group
  - AttributeGroup
```
public AttributeGroup(String name,
              int numAttributes)
```
    Creates an attribute group knowing only the number of attributes.
    
    Parameters:
    name - name of the attribute group
    numAttributes - number of attributes
  - AttributeGroup
```
public AttributeGroup(String name,
              Attribute[] attrs)
```
    Creates an attribute group with attributes.
    
    Parameters:
    name - name of the attribute group
    attrs - array of attributes. Attributes will be copied with their corresponding indices in the array.
- Method Detail
  - fromStructField
```
public static AttributeGroup fromStructField(StructField field)
```
    Creates an attribute group from a StructField instance.
  - name
```
public String name()
```
  - numAttributes
```
public scala.Option<Object> numAttributes()
```
  - attributes
```
public scala.Option<Attribute[]> attributes()
```
    Optional array of attributes. At most one of numAttributes and attributes can be defined.
    
    Returns:
    (undocumented)
  - size
```
public int size()
```
    Size of the attribute group. Returns -1 if the size is unknown.
  - hasAttr
```
public boolean hasAttr(String attrName)
```
    Test whether this attribute group contains a specific attribute.
  - indexOf
```
public int indexOf(String attrName)
```
    Index of an attribute specified by name.
  - apply
```
public Attribute apply(String attrName)
```
    Gets an attribute by its name.
  - getAttr
```
public Attribute getAttr(String attrName)
```
    Gets an attribute by its name.
  - apply
```
public Attribute apply(int attrIndex)
```
    Gets an attribute by its index.
  - getAttr
```
public Attribute getAttr(int attrIndex)
```
    Gets an attribute by its index.
  - toMetadata
```
public Metadata toMetadata(Metadata existingMetadata)
```
    Converts to ML metadata with some existing metadata.
  - toMetadata
```
public Metadata toMetadata()
```
    Converts to ML metadata
  - toStructField
```
public StructField toStructField(Metadata existingMetadata)
```
    Converts to a StructField with some existing metadata.
  - toStructField
```
public StructField toStructField()
```
    Converts to a StructField.
  - equals
```
public boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class AttributeGroup

Constructor Summary

Method Summary

Methods inherited from class Object

Constructor Detail

AttributeGroup

AttributeGroup

AttributeGroup

Method Detail

fromStructField

name

numAttributes

attributes

size

hasAttr

indexOf

apply

getAttr

apply

getAttr

toMetadata

toMetadata

toStructField

toStructField

equals

hashCode

toString