ArcGIS Reference

Parameters

initial SOM

The initial SOM to train.

training data

The data with which to train the SOM.

length of training

The length of training as measured by the total number of individual data row exposures.

initial learning rate

The initial learing rate for the SOM.

initial neighborhood radius

The initial distance over which a neighborhood is defined.

trained SOM

The ouput trained SOM.

distance metric

The distance metric to use when training the SOM. The Euclidean distance metric uses SOM_PAK as released from the Helsinki University of Technology. The Cosine distance metric uses SOM_PAK as modified by Fareed Qaddoura.

random generator seed

The seed for the random number generator, by default the current time is used.

fixed points

Use fixed point qualifiers in the training.

use weights

Use weighting qualifiers in the training.

read buffer

The number of lines to read at a time.

alpha type

The learning rate function type. Linear (linear) is defined as initial alpha * [1 - (current training step/run length)]. Inverse-time (inverse_t) is defined as initial alpha * [(run length/100)/((run length/100)+current training step)].

snapshot file

A series of files to contain the intermediate SOMs. If the name contains %d the current step number will used in the file name.

shapshot interval

The interval at which to take the snapshots.

Code Reference

uiVsom.vsom(cin, din, cout, rlen, alpha, radius, rand='#', fixed='#', weights='#', buffer='#', alpha_type='#', snapfile='#', snapinterval='#', path='\\bin\\SOM_PAK\\')

Trains a SOM using the specified parameters.

Arguments :

cin The input codebook file. din The training data. cout The output codebook file. rlen The length of training. alpha The initial rate of learning. radius The initial radius of neighborhoods. rand optional A seed for the random number generator. fixed optional Use fixed points. weights optional Use weights for variables. buffer optional The read buffer size in number of lines. alpha_type The type of alpha decrease either linear (default) or inverse time. snapfile The snapshot filename. snapinterval The interval between snapshots.