/**
* 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));
}
/**
* Returns true if enough rounds have passed to warrant updates of duty cycles
*
* @param c the {@link Connections} memory encapsulation
* @return
*/
public boolean isUpdateRound(Connections c) {
return c.getIterationNum() % c.getUpdatePeriod() == 0;
}