/// <summary>
/// Computes the FilterMap by convolution over each Input array
/// from Upstream layer
///
/// This function contains the sliding convolution window logic
/// </summary>
/// <param name="upStreamLayer"></param>
public override void ComputeValueMap()
{
int filterSize = _weights.Length; //Filter is same as window
//Slide the filter Window to compute value for each Cell in ValueMap (VM)
for (int idxRowVM = 0; idxRowVM < GetValueMapNoOfRows(); idxRowVM++)
{ //idxRowVM
for (int idxColVM = 0; idxColVM < GetValueMapNoOfColumns(); idxColVM++)
{ //idxColVM
double sum = 0;
int idxUpValueMapCol = 0, idxUpValueMapRow = 0;
//Set the filter window co-ordinates in the upstream value map
//relative to the current Value Map
int upMapLeftCol = idxColVM * _stride;
int upMapLeftRow = idxRowVM * _stride;
//TODO: Assign value
for (int idxFilter = 0; idxFilter < _upStreamLayer.GetNumberOfFilterUnits();
idxFilter++) //For each Filter Unit Upstream
{
SingleFilterUnit upFilterUnit =
(SingleFilterUnit)_upStreamLayer.GetFilterUnit(idxFilter);
for (int idxFilterRow = 0; idxFilterRow < filterSize; idxFilterRow++)
{
for (int idxFilterCol = 0; idxFilterCol < filterSize; idxFilterCol++)
{
//Update value
idxUpValueMapCol = upMapLeftCol + idxFilterCol;
idxUpValueMapRow = upMapLeftRow + idxFilterRow;
//Multiply upStream FilterMap by current Filter weights
sum += _weights[idxFilterCol][idxFilterRow] *
upFilterUnit.GetValueMapAtIndex(idxUpValueMapCol,
idxUpValueMapRow);
} //idxFilterCol
//Do for bias term
sum += _bias * 1.0;
} //idxFilterRow
} //idxFilter
//Normalize Sum
sum = sum / (filterSize * 2); //divide sum by filter Grid size
//Apply activation function - this saves time
sum = _activationFunction.GetValue(sum);
ValueMap[idxColVM][idxRowVM] = sum; //Assign value to FilterMap
} //idxColFM
} //idxRowFM
}
/// <summary>
/// Computes the ValueMap using the provided Pooling function
/// </summary>
public override void ComputeValueMap()
{
int poolSize = _poolSize; //Filter is same as window
//Slide the filter Window to compute value for each Cell in ValueMap (VM)
for (int idxRowVM = 0; idxRowVM < GetValueMapNoOfRows(); idxRowVM++)
{ //idxRowVM
for (int idxColVM = 0; idxColVM < GetValueMapNoOfColumns(); idxColVM++)
{ //idxColVM
int idxUpValueMapCol = 0, idxUpValueMapRow = 0;
//Set the filter window co-ordinates in the upstream value map
//relative to the current Value Map
int upMapLeftCol = idxColVM * _stride;
int upMapLeftRow = idxRowVM * _stride;
//TODO: Assign value
for (int idxFilter = 0; idxFilter < _upStreamLayer.GetNumberOfFilterUnits();
idxFilter++) //For each Filter Unit Upstream
{
SingleFilterUnit upFilterUnit =
(SingleFilterUnit)_upStreamLayer.GetFilterUnit(idxFilter);
for (int idxPoolRow = 0; idxPoolRow < poolSize; idxPoolRow++)
{
for (int idxPoolCol = 0; idxPoolCol < poolSize; idxPoolCol++)
{
//Update value
idxUpValueMapCol = upMapLeftCol + idxPoolCol;
idxUpValueMapRow = upMapLeftRow + idxPoolRow;
//Multiply upStream FilterMap by current Filter weights
_poolingFunction.AddValue(upFilterUnit.GetValueMapAtIndex(idxUpValueMapCol,
idxUpValueMapRow));
} //idxFilterCol
}
//Compute Value
}//idxFilter
//Apply pooling function - this saves time
ValueMap[idxColVM][idxRowVM] =
_poolingFunction.GetValue();; //Assign value to FilterMap
} //idxColFM
} //idxRowFM
}