/// <summary>
/// Setup function for shaping the input and output arrays to broadcast compatible shapes.
/// If no output array is given, a compatible output array is created
/// </summary>
/// <typeparam name="Ta">The type of input data to operate on</typeparam>
/// <typeparam name="Tb">The type of output data to operate on</typeparam>
/// <param name="in1">The left-hand-side input argument</param>
/// <param name="in2">The right-hand-side input argument</param>
/// <param name="out">The output target</param>
/// <returns>A tupple with broadcast compatible shapes for the inputs, and an output array</returns>
private static Tuple <NdArray <Ta>, NdArray <Ta>, NdArray <Tb> > SetupApplyHelper <Ta, Tb>(NdArray <Ta> in1, NdArray <Ta> in2, NdArray <Tb> @out)
{
Tuple <Shape, Shape> broadcastshapes = Shape.ToBroadcastShapes(in1.Shape, in2.Shape);
if (@out == null)
{
//We allocate a new array
@out = new NdArray <Tb>(broadcastshapes.Item1.Plain);
}
else
{
if (@out.Shape.Dimensions.Length != broadcastshapes.Item1.Dimensions.Length)
{
throw new Exception("Target array does not have the right number of dimensions");
}
for (long i = 0; i < @out.Shape.Dimensions.Length; i++)
{
if (@out.Shape.Dimensions[i].Length != broadcastshapes.Item1.Dimensions[i].Length)
{
throw new Exception("Dimension size of target array is incorrect");
}
}
}
var op1 = in1.Reshape(broadcastshapes.Item1);
var op2 = in2.Reshape(broadcastshapes.Item2);
return(new Tuple <NdArray <Ta>, NdArray <Ta>, NdArray <Tb> >(op1, op2, @out));
}
NdArray ForwardCpu([NotNull] NdArray val)
{
NdArray result = val.Clone();
result.ParentFunc = this;
result.Reshape(false, Shape);
return(result);
}
NdArray ForwardCpu(NdArray val)
{
NdArray result = val.Clone();
result.ParentFunc = this;
result.Reshape(this.Shape);
return(result);
}
/// <summary>
/// Pads the NdArray from the left with size-one dimensions until it has at least the specified number of
/// dimensions.
/// </summary>
/// <param name="minNumDim">The minimum number of dimensions.</param>
/// <param name="source">The NdArray to operate on.</param>
/// <returns>A NdArray with at least <paramref name="minNumDim"/> dimensions.</returns>
public static NdArray <T> AtLeastNd(int minNumDim, NdArray <T> source)
{
if (source.NumDimensions >= minNumDim)
{
return(source);
}
var newShape = Enumerable.Repeat(1, minNumDim - source.NumDimensions).Concat(source.Shape).ToArray();
return(source.Reshape(newShape));
}
////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Initializes a new instance of the KelpNet.Functions.Connections.Convolution2D class.
/// </summary>
///
/// <param name="linear"> The linear. </param>
////////////////////////////////////////////////////////////////////////////////////////////////////
public Convolution2D(bool verbose, [NotNull] Linear linear)
: base(verbose, FUNCTION_NAME, linear.Activator, new[] { new KeyValuePair <string, string>(PARAM_NAME, PARAM_VALUE) }, linear.Name, linear.InputNames, linear.OutputNames, linear.GpuEnable)
{
_kWidth = 1;
_kHeight = 1;
_strideX = 1;
_strideY = 1;
_padX = 0;
_padY = 0;
Parameters = linear.Parameters;
Weight = linear.Weight;
Weight.Reshape(verbose, OutputCount, InputCount, _kHeight, _kWidth);
Bias = linear.Bias;
NoBias = linear.NoBias;
}
/// <summary>
/// Repeats the NdArray along an axis.
/// </summary>
/// <param name="axis">The axis to repeat along.</param>
/// <param name="repeats">The number of repetitions.</param>
/// <param name="source">The NdArray to repeat.</param>
/// <returns>The repeated NdArray.</returns>
public static NdArray <T> Replicate(int axis, int repeats, NdArray <T> source)
{
NdArray <T> .CheckAxis(axis, source);
if (repeats < 0)
{
throw new ArgumentException("Number of repetitions cannot be negative.", "repeats");
}
// 1. insert axis of size one left to repetition axis
// 2. broadcast along the new axis to number of repetitions
// 3. reshape to result shape
var step1 = source.Reshape(List.Insert(axis, 1, source.Shape));
var step2 = NdArray <T> .BraodcastDim(axis, repeats, step1);
var step3 = step2.Reshape(List.Set(axis, repeats * source.Shape[axis], source.Shape));
return(step3);
}
/// <summary>
/// Flattens the NdArray into a (one-dimensional) vector.
/// </summary>
/// <param name="source">The NdArray to operate on.</param>
/// <returns>A vector.</returns>
public static NdArray <T> Flatten(NdArray <T> source)
{
return(source.Reshape(new[] { SpecialIdx.Remainder }));
}
private static void FillDiagonal(NdArray a, DATA val)
{
long d = a.Shape.Dimensions[0].Length;
a.Reshape(new NumCIL.Shape(new long[] { d }, 0, new long[] { d+1 })).Set(val);
}
private static void FillDiagonal(NdArray a, DATA val)
{
long d = a.Shape.Dimensions[0].Length;
a.Reshape(new NumCIL.Shape(new long[] { d }, 0, new long[] { d + 1 })).Set(val);
}
