SMNumericSigmoid (ProCAKE Framework 4.0.0 API)

All Superinterfaces:

SimilarityMeasure, SMNumeric

All Known Implementing Classes:

SMNumericSigmoidImpl
```
public interface SMNumericSigmoid
extends SMNumeric
```
We can also use sigmoid functions as a generalization of threshold functions. The parameter $\theta \geq 0$ specifies the difference value at which the similarity has a value of $0.5$. The parameter $\alpha>0$ specifies the steepness of the similarity decrease: the smaller $\alpha$ the steeper is the decrease.

Nested Class Summary
- Nested classes/interfaces inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric
  SMNumeric.ZERO_OUT_STRATEGIES

Field Summary

Fields
Modifier and Type	Field	Description
`static double`	`DEFAULT_ALPHA`	The default alpha value is 1.0.
`static double`	`DEFAULT_THETA`	The default theta value is 1.0.
`static String`	`NAME`	Name of similarity measure is "NumericSigmoid".

Fields inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure
COMPONENT, COMPONENT_KEY, LOG_ORDER_NAME_NOT_FOUND

Fields inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric
DEFAULT_STRATEGY

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`double`	`getAlpha()`
`double`	`getTheta()`
`void`	`setAlpha(double alpha)`	Alpha is necessary for sigmoid function.
`void`	`setTheta(double theta)`	Theta is necessary for the sigmoid function.

Methods inherited from interface de.uni_trier.wi2.procake.similarity.SimilarityMeasure
compute, getDataClass, getName, getSystemName, isForceOverride, isReusable, setForceOverride

Methods inherited from interface de.uni_trier.wi2.procake.similarity.base.numeric.SMNumeric
getAsymmetricStrategy, setAsymmetricStrategy

- Field Detail
  - NAME
```
static final String NAME
```
    Name of similarity measure is "NumericSigmoid".
    
    See Also:
    
    Constant Field Values
  - DEFAULT_ALPHA
```
static final double DEFAULT_ALPHA
```
    The default alpha value is 1.0.
    
    See Also:
    
    Constant Field Values
  - DEFAULT_THETA
```
static final double DEFAULT_THETA
```
    The default theta value is 1.0.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - getAlpha
```
double getAlpha()
```
  - setAlpha
```
void setAlpha(double alpha)
```
    Alpha is necessary for sigmoid function. Alpha should be very small, e.g., 0.1 or 0.01.
    
    Parameters:
    
    alpha - must be greater zero
  - getTheta
```
double getTheta()
```
  - setTheta
```
void setTheta(double theta)
```
    Theta is necessary for the sigmoid function. Theta must be between 0 an 1.
    
    Parameters:
    
    theta - must be greater zero