oracle.dmt.odm.settings.algorithm
Class NaiveBayesSettings

java.lang.Object
  |
  +--oracle.dmt.odm.MiningObject
        |
        +--oracle.dmt.odm.settings.algorithm.MiningAlgorithmSettings
              |
              +--oracle.dmt.odm.settings.algorithm.NaiveBayesSettings

All Implemented Interfaces:

java.io.Serializable

public class NaiveBayesSettings

extends MiningAlgorithmSettings

An instance of NaiveBayesSettings is used to specify settings for the Naive Bayes algorithm. Two settings are available: singleton threshold and pairwise threshold, as described below.

Since:

9.0.1

See Also:

Serialized Form

Constructor Summary

NaiveBayesSettings()
Creates NaiveBayesSettings instance with the default singletonThreshold value of 0.01 and pairwiseThreshold value of 0.001

NaiveBayesSettings(float singletonThreshold, float pairwiseThreshold)
Creates NaiveBayesSettings instance.

Method Summary

float	getPairwiseThreshold() Returns the pairwise threshold, a threshold on the count of the frequent item pairs.
float	getSingletonThreshold() Returns the singleton threshold, a threshold on the count of the frequent items.
void	setPairwiseThreshold(float pairwiseThreshold) Sets the pairwise threshold.
void	setSingletonThreshold(float singletonThreshold) Sets the singleton threshold.
void	validate() Validates the thresholds of the NaiveBayesSettings.

Methods inherited from class oracle.dmt.odm.settings.algorithm.MiningAlgorithmSettings

getMiningAlgorithm, getMiningAlgorithmName

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NaiveBayesSettings

public NaiveBayesSettings(float singletonThreshold,
                          float pairwiseThreshold)
                   throws InvalidArgumentException

Creates NaiveBayesSettings instance. Setting the thresholds closer to 0 may result in a more accurate model, but it will take longer to build. Setting the thresholds closer to 1 may produce models faster, but with less accuracy. A reasonable starting point is 0.01 for singletonThreshold and 0.001 for pairwiseThreshold.

Throws:

InvalidArgumentException -

• if singletonThreshold < 0 or singletonThreshold > 1, or
• if pairwiseThreshold < 0 or pairwiseThreshold > 1

NaiveBayesSettings

public NaiveBayesSettings()

Creates NaiveBayesSettings instance with the default singletonThreshold value of 0.01 and pairwiseThreshold value of 0.001

Method Detail

getSingletonThreshold

public float getSingletonThreshold()

Returns the singleton threshold, a threshold on the count of the frequent items. An item is a frequent item if it is included in a sufficiently large number of transactions. The singleton threshold is expressed as a percentage of the number of profiles. Suppose that the total number of transactions where an item appears is k and the total number of profiles is P, and t is the singleton threshold expressed as a percentage of P (0.01 indicates 1 percent of P). Then, the item is a frequent item if k >= t*P.

Returns:

the singleton threshold

getPairwiseThreshold

public float getPairwiseThreshold()

Returns the pairwise threshold, a threshold on the count of the frequent item pairs. An item pair is a frequent item pair if the items in the pair are frequent items that occur together in a sufficiently large number of profiles. Suppose that two distinct items occur together in k profiles, the total number of profiles that include the frequent items is P, and t is the threshold expressed in percentage (0.01 indicates 1 percent of P). Then the pair is a frequent item pair if k >= t*P.

Returns:

The pairwise threshold

setPairwiseThreshold

public void setPairwiseThreshold(float pairwiseThreshold)

Sets the pairwise threshold.

setSingletonThreshold

public void setSingletonThreshold(float singletonThreshold)

Sets the singleton threshold.

validate

public void validate()
              throws MiningObjectException

Validates the thresholds of the NaiveBayesSettings.

Overrides:

validate in class MiningAlgorithmSettings

Throws:

MiningObjectException -

• if singletonThreshold < 0 or singletonThreshold > 1, or
• if pairwiseThreshold < 0 or pairwiseThreshold > 1.