/// <summary>コンストラクタ</summary>
public Broadcast(Field infield, Field outfield, Shape shape)
: base(new Field[] { infield }, outfield)
{
if (shape.Ndim < infield.Shape.Ndim)
{
throw new ArgumentException(ExceptionMessage.Broadcast(infield.Shape, shape));
}
List <int> axes_keepdims = new List <int>();
List <int> axes_abandondims = new List <int>();
for (int i = 0; i < infield.Shape.Ndim; i++)
{
if (infield.Shape[i] == 1 && shape[i] > 1)
{
axes_keepdims.Add(i);
}
}
for (int i = infield.Shape.Ndim; i < shape.Ndim; i++)
{
axes_abandondims.Add(i);
}
this.axes_keepdims = axes_keepdims.ToArray();
this.axes_abandondims = axes_abandondims.ToArray();
this.InShape = infield.Shape;
this.OutShape = shape;
}
/// <summary>コンストラクタ</summary>
public Broadcast(Shape inshape, Shape outshape)
{
if (BroadcastShape(inshape, outshape) != outshape)
{
throw new ArgumentException(ExceptionMessage.Broadcast(inshape, outshape));
}
this.arguments = new List <(ArgumentType type, Shape shape)> {
(ArgumentType.In, inshape),
(ArgumentType.Out, outshape),
};
}
/// <summary>コンストラクタ</summary>
public Broadcast(Shape inshape, Shape targetshape)
: base(inputs: 1, outputs: 1, allow_resubstitution: false)
{
if (inshape.Ndim > targetshape.Ndim)
{
throw new ArgumentException(ExceptionMessage.Broadcast(inshape, targetshape));
}
for (int i = 0; i < inshape.Ndim; i++)
{
if (inshape[i] != 1 && inshape[i] != targetshape[i])
{
throw new ArgumentException(ExceptionMessage.Broadcast(inshape, targetshape));
}
}
this.InShape = inshape;
this.OutShape = Operators.ArrayManipulation.Broadcast.BroadcastShape(inshape, targetshape);
this.TargetShape = targetshape;
}
/// <summary>形状を調整する</summary>
public static VariableNode AdjectShape(VariableNode node, Shape shape)
{
if (shape != node.Shape)
{
if (shape.Ndim == 0 && node.Shape.Ndim > 0)
{
node = Sum(node, keepdims: false);
}
else if (shape.Ndim == 1 && node.Shape.Ndim > 1 && shape[0] == node.Shape[0])
{
int[] axes = (new int[node.Shape.Ndim - 1]).Select((_, idx) => idx + 1).ToArray();
node = Sum(node, axes, keepdims: false);
}
else
{
throw new ArgumentException(ExceptionMessage.Broadcast(node.Shape, shape));
}
}
return(node);
}