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## weka.classifiers.functions.neural
Class NeuralConnection

    java.lang.Object
      weka.classifiers.functions.neural.NeuralConnection

All Implemented Interfaces:
  java.io.Serializable

Direct Known Subclasses:
  NeuralNode

    public abstract class NeuralConnection

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

Abstract unit in a NeuralNetwork.

Version:
  $Revision: 1.4 $
Author:
  Malcolm Ware (mfw4@cs.waikato.ac.nz)
See Also:
  Serialized Form

Field Summary
`static int` | `CONNECTED` This flag is set once the unit has a connection.
`static int` | `INPUT` This unit is an input unit.
`static int` | `OUTPUT` This unit is an output unit.
`static int` | `PURE_INPUT` This unit is a pure input unit.
`static int` | `PURE_OUTPUT` This unit is a pure output unit.
`static int` | `UNCONNECTED` This unit is not connected to any others.

Constructor Summary
`NeuralConnection(java.lang.String id)` Constructs The unit with the basic connection information prepared for use.

Method Summary
`static boolean` | `connect(NeuralConnection s, NeuralConnection t)` Connects two units together.
`static boolean` | `disconnect(NeuralConnection s, NeuralConnection t)` Disconnects two units.
`void` | `drawHighlight(java.awt.Graphics g, int w, int h)` Call this function to draw the node highlighted.
`void` | `drawInputLines(java.awt.Graphics g, int w, int h)` Call this function to draw the nodes input connections.
`void` | `drawNode(java.awt.Graphics g, int w, int h)` Call this function to draw the node.
`void` | `drawOutputLines(java.awt.Graphics g, int w, int h)` Call this function to draw the nodes output connections.
`abstract double` | `errorValue(boolean calculate)` Call this to get the error value of this unit.
`java.lang.String` | `getId()`
`int[]` | `getInputNums()` Use this to get easy access to the input numbers.
`NeuralConnection[]` | `getInputs()` Use this to get easy access to the inputs.
`int` | `getNumInputs()`
`int` | `getNumOutputs()`
`int[]` | `getOutputNums()` Use this to get easy access to the output numbers.
`NeuralConnection[]` | `getOutputs()` Use this to get easy access to the outputs.
`int` | `getType()`
`double` | `getX()`
`double` | `getY()`
`boolean` | `onUnit(java.awt.Graphics g, int x, int y, int w, int h)` Call this function to determine if the point at x,y is on the unit.
`abstract double` | `outputValue(boolean calculate)` Call this to get the output value of this unit.
`void` | `removeAllInputs()` This function will remove all the inputs to this unit.
`void` | `removeAllOutputs()` This function will remove all outputs to this unit.
`abstract void` | `reset()` Call this to reset the unit for another run.
`void` | `setType(int t)`
`void` | `setX(double x)`
`void` | `setY(double y)`
`void` | `updateWeights(double l, double m)` Call this function to update the weight values at this unit.
`double` | `weightValue(int n)` Call this to get the weight value on a particular connection.

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

Field Detail

### UNCONNECTED

    public static final int UNCONNECTED

  This unit is not connected to any others.

  See Also:
    Constant Field Values

### PURE_INPUT

    public static final int PURE_INPUT

  This unit is a pure input unit.

  See Also:
    Constant Field Values

### PURE_OUTPUT

    public static final int PURE_OUTPUT

  This unit is a pure output unit.

  See Also:
    Constant Field Values

### INPUT

    public static final int INPUT

  This unit is an input unit.

  See Also:
    Constant Field Values

### OUTPUT

    public static final int OUTPUT

  This unit is an output unit.

  See Also:
    Constant Field Values

### CONNECTED

    public static final int CONNECTED

  This flag is set once the unit has a connection.

  See Also:
    Constant Field Values

Constructor Detail

### NeuralConnection

    public NeuralConnection(java.lang.String id)

  Constructs The unit with the basic connection information prepared for use.

Method Detail

### getId

    public java.lang.String getId()

  Returns:
    The identity string of this unit.

### getType

    public int getType()

  Returns:
    The type of this unit.

### setType

    public void setType(int t)

  Parameters:
    `t` - The new type of this unit.

### reset

    public abstract void reset()

  Call this to reset the unit for another run. It is expected by that this unit will call the reset functions of all input units to it. It is also expected that this will not be done if the unit has already been reset (or atleast appears to be).

### outputValue

    public abstract double outputValue(boolean calculate)

  Call this to get the output value of this unit.

  Parameters:
    `calculate` - True if the value should be calculated if it hasn't been already.
  Returns:
    The output value, or NaN, if the value has not been calculated.

### errorValue

    public abstract double errorValue(boolean calculate)

  Call this to get the error value of this unit.

  Parameters:
    `calculate` - True if the value should be calculated if it hasn't been already.
  Returns:
    The error value, or NaN, if the value has not been calculated.

### weightValue

    public double weightValue(int n)

  Call this to get the weight value on a particular connection.

  Parameters:
    `n` - The connection number to get the weight for, -1 if The threshold weight should be returned.
  Returns:
    This function will default to return 1. If overridden, it should return the value for the specified connection or if -1 then it should return the threshold value. If no value exists for the specified connection, NaN will be returned.

### updateWeights

    public void updateWeights(double l,
                              double m)

  Call this function to update the weight values at this unit. After the weights have been updated at this unit, All the input connections will then be called from this to have their weights updated.

  Parameters:
    `l` - The learning Rate to use.
    `m` - The momentum to use.

### getInputs

    public NeuralConnection[] getInputs()

  Use this to get easy access to the inputs. It is not advised to change the entries in this list (use the connecting and disconnecting functions to do that)

  Returns:
    The inputs list.

### getOutputs

    public NeuralConnection[] getOutputs()

  Use this to get easy access to the outputs. It is not advised to change the entries in this list (use the connecting and disconnecting functions to do that)

  Returns:
    The outputs list.

### getInputNums

    public int[] getInputNums()

  Use this to get easy access to the input numbers. It is not advised to change the entries in this list (use the connecting and disconnecting functions to do that)

  Returns:
    The input nums list.

### getOutputNums

    public int[] getOutputNums()

  Use this to get easy access to the output numbers. It is not advised to change the entries in this list (use the connecting and disconnecting functions to do that)

  Returns:
    The outputs list.

### getX

    public double getX()

  Returns:
    the x coord.

### getY

    public double getY()

  Returns:
    the y coord.

### setX

    public void setX(double x)

  Parameters:
    `x` - The new value for it's x pos.

### setY

    public void setY(double y)

  Parameters:
    `y` - The new value for it's y pos.

### onUnit

    public boolean onUnit(java.awt.Graphics g,
                          int x,
                          int y,
                          int w,
                          int h)

  Call this function to determine if the point at x,y is on the unit.

  Parameters:
    `g` - The graphics context for font size info.
    `x` - The x coord.
    `y` - The y coord.
    `w` - The width of the display.
    `h` - The height of the display.
  Returns:
    True if the point is on the unit, false otherwise.

### drawNode

    public void drawNode(java.awt.Graphics g,
                         int w,
                         int h)

  Call this function to draw the node.

  Parameters:
    `g` - The graphics context.
    `w` - The width of the drawing area.
    `h` - The height of the drawing area.

### drawHighlight

    public void drawHighlight(java.awt.Graphics g,
                              int w,
                              int h)

  Call this function to draw the node highlighted.

  Parameters:
    `g` - The graphics context.
    `w` - The width of the drawing area.
    `h` - The height of the drawing area.

### drawInputLines

    public void drawInputLines(java.awt.Graphics g,
                               int w,
                               int h)

  Call this function to draw the nodes input connections.

  Parameters:
    `g` - The graphics context.
    `w` - The width of the drawing area.
    `h` - The height of the drawing area.

### drawOutputLines

    public void drawOutputLines(java.awt.Graphics g,
                                int w,
                                int h)

  Call this function to draw the nodes output connections.

  Parameters:
    `g` - The graphics context.
    `w` - The width of the drawing area.
    `h` - The height of the drawing area.

### removeAllInputs

    public void removeAllInputs()

  This function will remove all the inputs to this unit. In doing so it will also terminate the connections at the other end.

### removeAllOutputs

    public void removeAllOutputs()

  This function will remove all outputs to this unit. In doing so it will also terminate the connections at the other end.

### getNumInputs

    public int getNumInputs()

  Returns:
    The number of input connections.

### getNumOutputs

    public int getNumOutputs()

  Returns:
    The number of output connections.

### connect

    public static boolean connect(NeuralConnection s,
                                  NeuralConnection t)

  Connects two units together.

  Parameters:
    `s` - The source unit.
    `t` - The target unit.
  Returns:
    True if the units were connected, false otherwise.

### disconnect

    public static boolean disconnect(NeuralConnection s,
                                     NeuralConnection t)

  Disconnects two units.

  Parameters:
    `s` - The source unit.
    `t` - The target unit.
  Returns:
    True if the units were disconnected, false if they weren't (probably due to there being no connection).

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