Array2FeatureVector (Mallet 2 API)

java.lang.Object
- cc.mallet.pipe.Pipe
- - cc.mallet.pipe.Array2FeatureVector

All Implemented Interfaces:

AlphabetCarrying, java.io.Serializable
```
public class Array2FeatureVector
extends Pipe
```
Converts a Java array of numerical types to a FeatureVector, where the Alphabet is the data array index wrapped in an Integer object.

Author:

Jerod Weinman weinman@cs.umass.edu

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor	Description
`Array2FeatureVector()`
`Array2FeatureVector(int capacity)`
`Array2FeatureVector(Alphabet dataAlphabet, Alphabet targetAlphabet)`	Construct a pipe based on the dimensions of the data and target.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Instance`	`pipe(Instance carrier)`	Convert the data in an `Instance` from an array to a `FeatureVector` leaving other fields unchanged.
`int`	`size()`	Current size of the Vocabulary

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - Array2FeatureVector
```
public Array2FeatureVector(int capacity)
```
  - Array2FeatureVector
```
public Array2FeatureVector()
```
  - Array2FeatureVector
```
public Array2FeatureVector(Alphabet dataAlphabet,
                           Alphabet targetAlphabet)
```
    Construct a pipe based on the dimensions of the data and target.
- Method Detail
  - pipe
```
public Instance pipe(Instance carrier)
              throws java.lang.IllegalStateException
```
    Convert the data in an Instance from an array to a FeatureVector leaving other fields unchanged. Instance.getData() must return a numeric array, and it is cast to double[]
    
    Overrides:
    
    pipe in class Pipe
    
    Throws:
    
    java.lang.IllegalStateException - If Instance.getTarget() is not a Labeling
  - size
```
public int size()
```
    Current size of the Vocabulary