/// <summary>
/// getActiveSegment(c, i, t, state)
/// For the given column c cell i, return a segment index such that
/// segmentActive(s,t, state) is true. If multiple segments are active, sequence
/// segments are given preference. Otherwise, segments with most activity
/// are given preference.
/// </summary>
/// <param name="cell"></param>
/// <param name="time"> </param>
/// <returns></returns>
public HtmSegment GetActiveSegment(HtmCellState cell, HtmTime time)
{
var activeSegments = cell.Segments.Where(segment => segment.IsActive(time)).ToList();
if (activeSegments.Count == 0)
{
return(null);
}
activeSegments.Sort(new SegmentComparer(time));
return(activeSegments.First());
}
public HtmCellState GetByTime(HtmTime time)
{
switch (time)
{
case HtmTime.Before:
return(_oldState);
case HtmTime.Now:
return(_newState);
default:
throw new ArgumentOutOfRangeException("time");
}
}
/// <summary>
/// This routine returns true if the number of
/// connected synapses on segment s that are active due to the given state at
/// time t is greater than activationThreshold. The parameter state can be
/// activeState, or learnState.
/// </summary>
public bool IsActive(HtmTime time)
{
var ammountConnected = Synapses.Count(synapse => synapse.IsConnected() && synapse.InputCell.GetByTime(time).ActiveState);
return(ammountConnected > _activationTreshold);
}
public SegmentComparer(HtmTime time)
{
_time = time;
}
