// helper for compute().
//Returns new state
func (tm *TemporalMemory) computeFn(activeColumns []int,
prevPredictiveCells []int,
prevActiveSegments []int,
prevActiveSynapsesForSegment map[int][]int,
prevWinnerCells []int,
connections *TemporalMemoryConnections,
learn bool) (activeCells []int,
winnerCells []int,
activeSynapsesForSegment map[int][]int,
activeSegments []int,
predictiveCells []int) {
var predictedColumns []int
activeCells, winnerCells, predictedColumns = tm.activateCorrectlyPredictiveCells(
prevPredictiveCells,
activeColumns,
connections)
_activeCells, _winnerCells, learningSegments := tm.burstColumns(activeColumns,
predictedColumns,
prevActiveSynapsesForSegment,
connections)
utils.Add(activeCells, _activeCells)
utils.Add(winnerCells, _winnerCells)
if learn {
tm.learnOnSegments(prevActiveSegments,
learningSegments,
prevActiveSynapsesForSegment,
winnerCells,
prevWinnerCells,
connections)
}
activeSynapsesForSegment = tm.computeActiveSynapses(activeCells, connections)
activeSegments, predictiveCells = tm.computePredictiveCells(activeSynapsesForSegment,
connections)
return activeCells,
winnerCells,
activeSynapsesForSegment,
activeSegments,
predictiveCells
}
/*
Phase 2: Burst unpredicted columns.
Pseudocode:
- for each unpredicted active column
- mark all cells as active
- mark the best matching cell as winner cell
- (learning)
- if it has no matching segment
- (optimization) if there are prev winner cells
- add a segment to it
- mark the segment as learning
*/
func (tm *TemporalMemory) burstColumns(activeColumns []int,
predictedColumns []int,
prevActiveSynapsesForSegment map[int][]int,
connections *TemporalMemoryConnections) (activeCells []int,
winnerCells []int,
learningSegments []int) {
unpredictedColumns := utils.Complement(activeColumns, predictedColumns)
for _, column := range unpredictedColumns {
cells := connections.CellsForColumn(column)
activeCells = utils.Add(activeCells, cells)
bestCell, bestSegment := tm.getBestMatchingCell(column,
prevActiveSynapsesForSegment,
connections)
winnerCells = append(winnerCells, bestCell)
if bestSegment == -1 {
//TODO: (optimization) Only do this if there are prev winner cells
bestSegment = connections.CreateSegment(bestCell)
}
//TODO: change to set data structure
if !utils.ContainsInt(bestSegment, learningSegments) {
learningSegments = append(learningSegments, bestSegment)
}
}
return activeCells, winnerCells, learningSegments
}