org.apache.commons.math3.ml.neuralnet.twod

## Class NeuronSquareMesh2D

- java.lang.Object
- - org.apache.commons.math3.ml.neuralnet.twod.NeuronSquareMesh2D

- All Implemented Interfaces:
    Serializable, Iterable<Neuron>

      public class NeuronSquareMesh2D
      extends Object
      implements Iterable<Neuron>, Serializable

  Neural network with the topology of a two-dimensional surface. Each neuron defines one surface element.
  This network is primarily intended to represent a Self Organizing Feature Map.
  Since:
    3.3
  See Also:
    `org.apache.commons.math3.ml.neuralnet.sofm`, Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `NeuronSquareMesh2D.HorizontalDirection` Horizontal (along row) direction.
    `static class` | `NeuronSquareMesh2D.VerticalDirection` Vertical (along column) direction.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `NeuronSquareMesh2D(int numRows, boolean wrapRowDim, int numCols, boolean wrapColDim, SquareNeighbourhood neighbourhoodType, FeatureInitializer[] featureInit)` Creates a two-dimensional network composed of square cells: Each neuron not located on the border of the mesh has four neurons linked to it.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `NeuronSquareMesh2D` | `copy()` Performs a deep copy of this instance.
    `Network` | `getNetwork()` Retrieves the underlying network.
    `Neuron` | `getNeuron(int i, int j)` Retrieves the neuron at location `(i, j)` in the map.
    `Neuron` | `getNeuron(int row, int col, NeuronSquareMesh2D.HorizontalDirection alongRowDir, NeuronSquareMesh2D.VerticalDirection alongColDir)` Retrieves the neuron at `(location[0], location[1])` in the map.
    `int` | `getNumberOfColumns()` Gets the number of neurons in each column of this map.
    `int` | `getNumberOfRows()` Gets the number of neurons in each row of this map.
    `Iterator<Neuron>` | `iterator()`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### NeuronSquareMesh2D

          public NeuronSquareMesh2D(int numRows,
                            boolean wrapRowDim,
                            int numCols,
                            boolean wrapColDim,
                            SquareNeighbourhood neighbourhoodType,
                            FeatureInitializer[] featureInit)

      Creates a two-dimensional network composed of square cells: Each neuron not located on the border of the mesh has four neurons linked to it.
      The links are bi-directional.
      The topology of the network can also be a cylinder (if one of the dimensions is wrapped) or a torus (if both dimensions are wrapped).
      Parameters:
        `numRows` - Number of neurons in the first dimension.
        `wrapRowDim` - Whether to wrap the first dimension (i.e the first and last neurons will be linked together).
        `numCols` - Number of neurons in the second dimension.
        `wrapColDim` - Whether to wrap the second dimension (i.e the first and last neurons will be linked together).
        `neighbourhoodType` - Neighbourhood type.
        `featureInit` - Array of functions that will initialize the corresponding element of the features set of each newly created neuron. In particular, the size of this array defines the size of feature set.
      Throws:
        `NumberIsTooSmallException` - if `numRows < 2` or `numCols < 2`.

  - ### Method Detail

    - #### copy

          public NeuronSquareMesh2D copy()

      Performs a deep copy of this instance. Upon return, the copied and original instances will be independent: Updating one will not affect the other.
      Returns:
        a new instance with the same state as this instance.
      Since:
        3.6

    - #### iterator

          public Iterator<Neuron> iterator()

      Specified by:
        `iterator` in interface `Iterable<Neuron>`
      Since:
        3.6

    - #### getNetwork

          public Network getNetwork()

      Retrieves the underlying network. A reference is returned (enabling, for example, the network to be trained). This also implies that calling methods that modify the `Network` topology may cause this class to become inconsistent.
      Returns:
        the network.

    - #### getNumberOfRows

          public int getNumberOfRows()

      Gets the number of neurons in each row of this map.
      Returns:
        the number of rows.

    - #### getNumberOfColumns

          public int getNumberOfColumns()

      Gets the number of neurons in each column of this map.
      Returns:
        the number of column.

    - #### getNeuron

          public Neuron getNeuron(int i,
                         int j)

      Retrieves the neuron at location `(i, j)` in the map. The neuron at position `(0, 0)` is located at the upper-left corner of the map.
      Parameters:
        `i` - Row index.
        `j` - Column index.
      Returns:
        the neuron at `(i, j)`.
      Throws:
        `OutOfRangeException` - if `i` or `j` is out of range.
      See Also:
        `getNeuron(int,int,HorizontalDirection,VerticalDirection)`

    - #### getNeuron

          public Neuron getNeuron(int row,
                         int col,
                         NeuronSquareMesh2D.HorizontalDirection alongRowDir,
                         NeuronSquareMesh2D.VerticalDirection alongColDir)

      Retrieves the neuron at `(location[0], location[1])` in the map. The neuron at position `(0, 0)` is located at the upper-left corner of the map.
      Parameters:
        `row` - Row index.
        `col` - Column index.
        `alongRowDir` - Direction along the given `row` (i.e. an offset will be added to the given column index.
        `alongColDir` - Direction along the given `col` (i.e. an offset will be added to the given row index.
      Returns:
        the neuron at the requested location, or `null` if the location is not on the map.
      See Also:
        `getNeuron(int,int)`

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