public Cpu3DTensor(int rows, int columns, int depth)
{
_rows = rows;
_columns = columns;
_depth = depth;
_data = new CpuMatrix(DenseMatrix.Build.Dense(rows * columns, depth));
}
public Cpu3DTensor(int rows, int columns, int depth)
{
RowCount = rows;
ColumnCount = columns;
Depth = depth;
_data = new CpuMatrix(DenseMatrix.Build.Dense(rows * columns, depth));
}
public Cpu4DTensor(int rows, int columns, int depth, int count)
{
_rows = rows;
_columns = columns;
_depth = depth;
_count = count;
_data = new CpuMatrix(DenseMatrix.Build.Dense(_rows * _count * _depth, _count));
}
public Cpu4DTensor(int rows, int columns, int depth, int count)
{
RowCount = rows;
ColumnCount = columns;
Depth = depth;
Count = count;
_data = new CpuMatrix(DenseMatrix.Build.Dense(RowCount * Count * Depth, Count));
}
public IMatrix CreateMatrix(IReadOnlyList <FloatArray> data)
{
var rowCount = data.Count;
var columnCount = data.First().Data.Length;
var ret = new CpuMatrix(DenseMatrix.Create(rowCount, columnCount, 0f));
for (var i = 0; i < rowCount; i++)
{
for (var j = 0; j < columnCount; j++)
{
ret[i, j] = data[i].Data[j];
}
}
return(ret);
}
public (I3DTensor Result, IReadOnlyList <(object X, object Y)> Index) MaxPool(
int filterWidth,
int filterHeight,
int stride,
bool calculateIndex)
{
var newColumns = (ColumnCount - filterWidth) / stride + 1;
var newRows = (RowCount - filterHeight) / stride + 1;
var matrixList = new List <CpuMatrix>();
var indexList = calculateIndex ? new List <(object X, object Y)>() : null;
var posList = ConvolutionHelper.Default(ColumnCount, RowCount, filterWidth, filterHeight, stride);
for (var k = 0; k < Depth; k++)
{
var matrix = _data[k];
var xIndex = new int[newColumns * newRows];
var yIndex = new int[newColumns * newRows];
var layer = new CpuMatrix(DenseMatrix.Create(newRows, newColumns, 0f));
foreach (var item in posList)
{
var first = item.First();
var targetX = first.X / stride;
var targetY = first.Y / stride;
var maxVal = float.MinValue;
var bestX = -1;
var bestY = -1;
foreach (var pos in item)
{
var val = matrix[pos.Y, pos.X];
if (val > maxVal || bestX == -1)
{
bestX = pos.X;
bestY = pos.Y;
maxVal = val;
}
}
var index = targetX * newRows + targetY;
xIndex[index] = bestX;
yIndex[index] = bestY;
layer[targetY, targetX] = maxVal;
}
matrixList.Add(layer);
indexList?.Add((xIndex, yIndex));
}
return(new Cpu3DTensor(matrixList), indexList);
}
public I3DTensor MaxPool(int filterWidth, int filterHeight, int stride, List <Dictionary <Tuple <int, int>, Tuple <int, int> > > indexPosList)
{
var newColumns = (ColumnCount - filterWidth) / stride + 1;
var newRows = (RowCount - filterHeight) / stride + 1;
var ret = new List <CpuMatrix>();
for (var k = 0; k < Depth; k++)
{
var matrix = _data[k];
var indexPos = new Dictionary <Tuple <int, int>, Tuple <int, int> >();
var layer = new CpuMatrix(DenseMatrix.Create(newRows, newColumns, 0f));
for (var x = 0; x < newColumns; x++)
{
for (var y = 0; y < newRows; y++)
{
var xOffset = x * stride;
var yOffset = y * stride;
var maxVal = float.MinValue;
var bestX = xOffset;
var bestY = yOffset;
for (var i = 0; i < filterWidth; i++)
{
for (var j = 0; j < filterHeight; j++)
{
var xPos = xOffset + i;
var yPos = yOffset + j;
var val = matrix[yPos, xPos];
if (val > maxVal)
{
bestX = xPos;
bestY = yPos;
maxVal = val;
}
}
}
indexPos[Tuple.Create(bestX, bestY)] = Tuple.Create(x, y);
layer[y, x] = maxVal;
}
}
if (indexPosList != null)
{
indexPosList.Add(indexPos);
}
ret.Add(layer);
}
return(new Cpu3DTensor(ret));
}
public Cpu3DTensor(IReadOnlyList <IIndexableMatrix> matrixList)
{
var first = matrixList.First();
Debug.Assert(matrixList.All(m => m.RowCount == first.RowCount && m.ColumnCount == first.ColumnCount));
_rows = first.RowCount;
_columns = first.ColumnCount;
_depth = matrixList.Count;
var offset = 0;
var rowSize = _rows * _columns;
var data = new float[rowSize * _depth];
foreach (var matrix in matrixList)
{
Array.Copy(matrix.GetInternalArray(), 0, data, offset, rowSize);
offset += rowSize;
}
_data = new CpuMatrix(DenseMatrix.Build.Dense(rowSize, _depth, data));
}
public Cpu4DTensor(IReadOnlyList <IIndexable3DTensor> tensorList)
{
var first = tensorList.First();
Debug.Assert(tensorList.All(m =>
m.RowCount == first.RowCount && m.ColumnCount == first.ColumnCount &&
m.Depth == first.Depth));
RowCount = first.RowCount;
ColumnCount = first.ColumnCount;
Depth = first.Depth;
Count = tensorList.Count;
var offset = 0;
var rowSize = RowCount * ColumnCount * Depth;
var data = new float[rowSize * Count];
foreach (var matrix in tensorList)
{
Array.Copy(matrix.GetInternalArray(), 0, data, offset, rowSize);
offset += rowSize;
}
_data = new CpuMatrix(DenseMatrix.Build.Dense(rowSize, Count, data));
}