internal unsafe void Propagate(ManagedNeuralComputationContext context, float* valueBuffer, float* eVector)
{
Contract.Requires(valueBuffer != null);
Contract.Requires(context != null);
lock (context.SyncRoot)
{
EnsureInitialized(context);
for (int compIndex = 0; compIndex < ForwardComputes.Length; compIndex++)
{
var comp = ForwardComputes[compIndex];
int iLayerIndex = comp.ConnectedLayerIndex;
int compOutputBufferSize = comp.OutputBuffer.Size;
for (int iValueIndex = 0; iValueIndex < compOutputBufferSize; iValueIndex++)
{
// i: iLayerIndex, iValueIndex
// Compute for Weights:
var compPWeightBuffers = GetPWeights(context, compIndex);
for (int jLayerIndex = 0; jLayerIndex < compPWeightBuffers.Length; jLayerIndex++)
{
var layerRelatedPBuffs = compPWeightBuffers[jLayerIndex];
var layerRelatedPrevPBuffs = comp.PrevPWeightBuffers[jLayerIndex];
int inputLayerSize = comp.InputValueAccessItems[jLayerIndex].InputSize;
Debug.Assert(compOutputBufferSize * inputLayerSize == layerRelatedPBuffs.Length);
Debug.Assert(compOutputBufferSize * inputLayerSize == layerRelatedPrevPBuffs.Length);
for (int jValueIndex = 0; jValueIndex < inputLayerSize; jValueIndex++)
{
int ijValueIndex = WeightAccessor.GetWeightValueIndex(jValueIndex, iValueIndex, compOutputBufferSize);
var valueRelatedPBuffs = layerRelatedPBuffs[ijValueIndex];
var valueRelatedPrevPBuffs = layerRelatedPrevPBuffs[ijValueIndex];
// i: iLayerIndex, iValueIndex
// j: jLayerIndex, jValueIndex
FlipPWeights(context, compIndex);
ComputePValues(valueBuffer, comp, valueRelatedPBuffs, valueRelatedPrevPBuffs, iLayerIndex, iValueIndex, jLayerIndex, jValueIndex, eVector);
}
}
// Compute for Bias
if (comp.PBiasBuffers != null)
{
FlipPBias(context, compIndex);
ComputePValues(valueBuffer, comp, GetPBias(context, compIndex), comp.PrevPBiasBuffers, iLayerIndex, iValueIndex, -1, -1, eVector);
}
}
}
}
}
private void FlipPBias(ManagedNeuralComputationContext context, int compIndex)
{
context.PValuePropagator_PBiasBufferFlipped[compIndex] = !context.PValuePropagator_PBiasBufferFlipped[compIndex];
}
private IntRange[] GetPBias(ManagedNeuralComputationContext context, int compIndex)
{
if (!context.PValuePropagator_PBiasBufferFlipped[compIndex])
{
return ForwardComputes[compIndex].PBiasBuffers;
}
else
{
return ForwardComputes[compIndex].PrevPBiasBuffers;
}
}
private void EnsureInitialized(ManagedNeuralComputationContext context)
{
if (context.PValuePropagator_PWeightBufferFlipped == null)
{
context.PValuePropagator_PWeightBufferFlipped = new bool[ForwardComputes.Length];
context.PValuePropagator_PBiasBufferFlipped = new bool[ForwardComputes.Length];
}
}