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java.lang.Objectorg.encog.util.normalize.output.BasicOutputField
org.encog.util.normalize.output.OutputFieldGrouped
org.encog.util.normalize.output.multiplicative.OutputFieldMultiplicative
public class OutputFieldMultiplicative
Both the multiplicative and z-axis normalization types allow a group of outputs to be adjusted so that the "vector length" is 1. Both go about it in different ways. Certain types of neural networks require a vector length of 1. The multiplicative normalization is more simple than Z-Axis normalization. Almost always Z=Axis normalization is a better choice. However, multiplicative can perform better than Z-Axis when all of the values are near zero most of the time. This can cause the "synthetic value" that z-axis uses to dominate and skew the answer. Multiplicative normalization works by calculating the vector length of the input fields and dividing each by that value. This also presents a problem, as the magnitude of the original fields is not used. For example, multiplicative normalization would not distinguish between (-2,1,3) and (-10,5,15). Both would result in the same output.
Constructor Summary | |
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OutputFieldMultiplicative()
The default constructor. |
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OutputFieldMultiplicative(OutputFieldGroup group,
InputField field)
Construct a multiplicative output field. |
Method Summary | |
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double |
calculate(int subfield)
Calculate the value for this output field. |
int |
getSubfieldCount()
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void |
rowInit()
Not needed for this sort of output field. |
Methods inherited from class org.encog.util.normalize.output.OutputFieldGrouped |
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getGroup, getSourceField |
Methods inherited from class org.encog.util.normalize.output.BasicOutputField |
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isIdeal, setIdeal |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public OutputFieldMultiplicative()
public OutputFieldMultiplicative(OutputFieldGroup group, InputField field)
group
- The group this field belongs to.field
- The input field that this field is based on.Method Detail |
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public double calculate(int subfield)
subfield
- The subfield is not used.
public int getSubfieldCount()
public void rowInit()
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