internal override void Map2ToUnchecked(VectorStorage <T> target, VectorStorage <T> other, Func <T, T, T> f,
Zeros zeros, ExistingData existingData)
{
if (target is SparseVectorStorage <T> )
{
// Recursive to dense target at first, since the operation is
// effectively dense anyway because at least one operand is dense
var intermediate = new DenseVectorStorage <T>(target.Length);
Map2ToUnchecked(intermediate, other, f, zeros, ExistingData.AssumeZeros);
intermediate.CopyTo(target, existingData);
return;
}
var denseTarget = target as DenseVectorStorage <T>;
var denseOther = other as DenseVectorStorage <T>;
if (denseTarget != null && denseOther != null)
{
CommonParallel.For(0, Data.Length, 4096, (a, b) =>
{
for (var i = a; i < b; i++)
{
denseTarget.Data[i] = f(Data[i], denseOther.Data[i]);
}
});
return;
}
var sparseOther = other as SparseVectorStorage <T>;
if (denseTarget != null && sparseOther != null)
{
var targetData = denseTarget.Data;
var otherIndices = sparseOther.Indices;
var otherValues = sparseOther.Values;
var otherValueCount = sparseOther.ValueCount;
var k = 0;
for (var i = 0; i < Data.Length; i++)
{
if (k < otherValueCount && otherIndices[k] == i)
{
targetData[i] = f(Data[i], otherValues[k]);
k++;
}
else
{
targetData[i] = f(Data[i], Zero);
}
}
return;
}
base.Map2ToUnchecked(target, other, f, zeros, existingData);
}
internal override void Map2ToUnchecked(VectorStorage <T> target, VectorStorage <T> other, Func <T, T, T> f, Zeros zeros, ExistingData existingData)
{
var processZeros = zeros == Zeros.Include || !Zero.Equals(f(Zero, Zero));
var denseTarget = target as DenseVectorStorage <T>;
var denseOther = other as DenseVectorStorage <T>;
if (denseTarget == null && (denseOther != null || processZeros))
{
// The handling is effectively dense but we're supposed to push
// to a sparse target. Let's use a dense target instead,
// then copy it normalized back to the sparse target.
var intermediate = new DenseVectorStorage <T>(target.Length);
Map2ToUnchecked(intermediate, other, f, zeros, ExistingData.AssumeZeros);
intermediate.CopyTo(target, existingData);
return;
}
if (denseOther != null)
{
T[] targetData = denseTarget.Data;
T[] otherData = denseOther.Data;
int k = 0;
for (int i = 0; i < otherData.Length; i++)
{
if (k < ValueCount && Indices[k] == i)
{
targetData[i] = f(Values[k], otherData[i]);
k++;
}
else
{
targetData[i] = f(Zero, otherData[i]);
}
}
return;
}
var sparseOther = other as SparseVectorStorage <T>;
if (sparseOther != null && denseTarget != null)
{
T[] targetData = denseTarget.Data;
int[] otherIndices = sparseOther.Indices;
T[] otherValues = sparseOther.Values;
int otherValueCount = sparseOther.ValueCount;
if (processZeros)
{
int p = 0, q = 0;
for (int i = 0; i < targetData.Length; i++)
{
var left = p < ValueCount && Indices[p] == i ? Values[p++] : Zero;
var right = q < otherValueCount && otherIndices[q] == i ? otherValues[q++] : Zero;
targetData[i] = f(left, right);
}
}
else
{
if (existingData == ExistingData.Clear)
{
denseTarget.Clear();
}
int p = 0, q = 0;
while (p < ValueCount || q < otherValueCount)
{
if (q >= otherValueCount || p < ValueCount && Indices[p] < otherIndices[q])
{
targetData[Indices[p]] = f(Values[p], Zero);
p++;
}
else if (p >= ValueCount || q < otherValueCount && Indices[p] > otherIndices[q])
{
targetData[otherIndices[q]] = f(Zero, otherValues[q]);
q++;
}
else
{
Debug.Assert(Indices[p] == otherIndices[q]);
targetData[Indices[p]] = f(Values[p], otherValues[q]);
p++;
q++;
}
}
}
return;
}
var sparseTarget = target as SparseVectorStorage <T>;
if (sparseOther != null && sparseTarget != null)
{
var indices = new List <int>();
var values = new List <T>();
int[] otherIndices = sparseOther.Indices;
T[] otherValues = sparseOther.Values;
int otherValueCount = sparseOther.ValueCount;
int p = 0, q = 0;
while (p < ValueCount || q < otherValueCount)
{
if (q >= otherValueCount || p < ValueCount && Indices[p] < otherIndices[q])
{
var value = f(Values[p], Zero);
if (!Zero.Equals(value))
{
indices.Add(Indices[p]);
values.Add(value);
}
p++;
}
else if (p >= ValueCount || q < otherValueCount && Indices[p] > otherIndices[q])
{
var value = f(Zero, otherValues[q]);
if (!Zero.Equals(value))
{
indices.Add(otherIndices[q]);
values.Add(value);
}
q++;
}
else
{
var value = f(Values[p], otherValues[q]);
if (!Zero.Equals(value))
{
indices.Add(Indices[p]);
values.Add(value);
}
p++;
q++;
}
}
sparseTarget.Indices = indices.ToArray();
sparseTarget.Values = values.ToArray();
sparseTarget.ValueCount = values.Count;
return;
}
// FALL BACK
base.Map2ToUnchecked(target, other, f, zeros, existingData);
}