internal HeadSetting(Unit gamma, ShiftedAddressing shiftedVector)
{
_gamma = gamma;
ShiftedVector = shiftedVector;
_shiftedVector = ShiftedVector.ShiftedVector;
_cellCount = _shiftedVector.Length;
AddressingVector = UnitFactory.GetVector(_cellCount);
//NO CLUE IN PAPER HOW TO IMPLEMENT - ONLY RESTRICTION IS THAT IT HAS TO BE LARGER THAN 1
//(Page 9, Part 3.3.2. Focusing by location)
_gammaIndex = Math.Log(Math.Exp(gamma.Value) + 1) + 1;
double sum = 0;
for (int i = 0; i < _cellCount; i++)
{
Unit unit = AddressingVector[i];
unit.Value = Math.Pow(_shiftedVector[i].Value, _gammaIndex);
sum += unit.Value;
}
foreach (Unit unit in AddressingVector)
{
unit.Value = unit.Value / sum;
if (double.IsNaN(unit.Value))
{
throw new Exception("Should not be NaN - Error");
}
}
}
internal MemoryState Process(Head[] heads)
{
int headCount = heads.Length;
int memoryColumnsN = _memory.CellCountN;
ReadData[] newReadDatas = new ReadData[headCount];
HeadSetting[] newHeadSettings = new HeadSetting[headCount];
for (int i = 0; i < headCount; i++)
{
Head head = heads[i];
BetaSimilarity[] similarities = new BetaSimilarity[_memory.CellCountN];
for (int j = 0; j < memoryColumnsN; j++)
{
Unit[] memoryColumn = _memory.Data[j];
SimilarityMeasure similarity = new SimilarityMeasure(new CosineSimilarityFunction(), head.KeyVector, memoryColumn);
similarities[j] = new BetaSimilarity(head.Beta, similarity);
}
ContentAddressing ca = new ContentAddressing(similarities);
GatedAddressing ga = new GatedAddressing(head.Gate, ca, _headSettings[i]);
ShiftedAddressing sa = new ShiftedAddressing(head.Shift, ga);
newHeadSettings[i] = new HeadSetting(head.Gamma, sa);
newReadDatas[i] = new ReadData(newHeadSettings[i], _memory);
}
NTMMemory newMemory = new NTMMemory(newHeadSettings, heads, _memory);
return new MemoryState(newMemory, newHeadSettings, newReadDatas);
}