/**
* Called to initialize the structural anatomy with configured values and prepare the anatomical
* entities for activation.
*
* @param c
*/
public void initMatrices(final Connections c) {
SparseObjectMatrix<Column> mem = c.getMemory();
c.setMemory(mem == null ? mem = new SparseObjectMatrix<>(c.getColumnDimensions()) : mem);
c.setInputMatrix(new SparseBinaryMatrix(c.getInputDimensions()));
// Calculate numInputs and numColumns
int numInputs = c.getInputMatrix().getMaxIndex() + 1;
int numColumns = c.getMemory().getMaxIndex() + 1;
if (numColumns <= 0) {
throw new InvalidSPParamValueException("Invalid number of columns: " + numColumns);
}
if (numInputs <= 0) {
throw new InvalidSPParamValueException("Invalid number of inputs: " + numInputs);
}
c.setNumInputs(numInputs);
c.setNumColumns(numColumns);
// Fill the sparse matrix with column objects
for (int i = 0; i < numColumns; i++) {
mem.set(i, new Column(c.getCellsPerColumn(), i));
}
c.setPotentialPools(new SparseObjectMatrix<Pool>(c.getMemory().getDimensions()));
c.setConnectedMatrix(new SparseBinaryMatrix(new int[] {numColumns, numInputs}));
// Initialize state meta-management statistics
c.setOverlapDutyCycles(new double[numColumns]);
c.setActiveDutyCycles(new double[numColumns]);
c.setMinOverlapDutyCycles(new double[numColumns]);
c.setMinActiveDutyCycles(new double[numColumns]);
c.setBoostFactors(new double[numColumns]);
Arrays.fill(c.getBoostFactors(), 1);
}
/**
* Updates the duty cycles for each column. The OVERLAP duty cycle is a moving average of the
* number of inputs which overlapped with each column. The ACTIVITY duty cycles is a moving
* average of the frequency of activation for each column.
*
* @param c the {@link Connections} (spatial pooler memory)
* @param overlaps an array containing the overlap score for each column. The overlap score for a
* column is defined as the number of synapses in a "connected state" (connected synapses)
* that are connected to input bits which are turned on.
* @param activeColumns An array containing the indices of the active columns, the sparse set of
* columns which survived inhibition
*/
public void updateDutyCycles(Connections c, int[] overlaps, int[] activeColumns) {
double[] overlapArray = new double[c.getNumColumns()];
double[] activeArray = new double[c.getNumColumns()];
ArrayUtils.greaterThanXThanSetToYInB(overlaps, overlapArray, 0, 1);
if (activeColumns.length > 0) {
ArrayUtils.setIndexesTo(activeArray, activeColumns, 1);
}
int period = c.getDutyCyclePeriod();
if (period > c.getIterationNum()) {
period = c.getIterationNum();
}
c.setOverlapDutyCycles(
updateDutyCyclesHelper(c, c.getOverlapDutyCycles(), overlapArray, period));
c.setActiveDutyCycles(updateDutyCyclesHelper(c, c.getActiveDutyCycles(), activeArray, period));
}