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## weka.core.pmml
Class MappingInfo

    java.lang.Object
      weka.core.pmml.MappingInfo

All Implemented Interfaces:
  java.io.Serializable

    public class MappingInfo

extends java.lang.Object
implements java.io.Serializable

Class that maintains the mapping between incoming data set structure and that of the mining schema.

Version:
  $Revision: 6464 $
Author:
  Mark Hall (mhall{[at]}pentaho{[dot]}com
See Also:
  Serialized Form

Field Summary
`static int` | `UNKNOWN_NOMINAL_VALUE` Index for incoming nominal values that are not defined in the mining schema.

Constructor Summary
`MappingInfo(Instances dataSet, MiningSchema miningSchema, Logger log)`

Method Summary
`java.lang.String` | `getFieldsMappingString()` Get a textual description of them mapping between mining schema fields and incoming data fields.
`double[]` | `instanceToSchema(Instance inst, MiningSchema miningSchema)` Convert an `Instance` to an array of values that matches the format of the mining schema.

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

Field Detail

### UNKNOWN_NOMINAL_VALUE

    public static final int UNKNOWN_NOMINAL_VALUE

  Index for incoming nominal values that are not defined in the mining schema.

  See Also:
    Constant Field Values

Constructor Detail

### MappingInfo

    public MappingInfo(Instances dataSet,
                       MiningSchema miningSchema,
                       Logger log)
                throws java.lang.Exception

Throws:
  `java.lang.Exception`

Method Detail

### instanceToSchema

    public double[] instanceToSchema(Instance inst,
                                     MiningSchema miningSchema)
                              throws java.lang.Exception

  Convert an `Instance` to an array of values that matches the format of the mining schema. First maps raw attribute values and then applies rules for missing values, outliers etc.

  Parameters:
    `inst` - the `Instance` to convert
    `miningSchema` - the mining schema incoming instance attributes
  Returns:
    an array of doubles that are values from the incoming Instances, correspond to the format of the mining schema and have had missing values, outliers etc. dealt with.
  Throws:
    `java.lang.Exception` - if something goes wrong

### getFieldsMappingString

    public java.lang.String getFieldsMappingString()

  Get a textual description of them mapping between mining schema fields and incoming data fields.

  Returns:
    a description of the fields mapping as a String

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