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Shape.cs
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141 lines (123 loc) · 4.76 KB
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using System;
using NumSharp.Core.Interfaces;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace NumSharp.Core
{
public partial class Shape : IShape
{
protected int _TensorLayout;
public int TensorLayout {get {return _TensorLayout;}}
protected int[] _Dimensions;
protected int[] _DimOffset;
protected int _size;
public int NDim => _Dimensions.Length;
public int[] Dimensions {get{return _Dimensions;}}
public int[] DimOffset {get{return _DimOffset;}}
public int Size {get{return _size;}}
protected void _SetDimOffset()
{
if (this._Dimensions.Length == 0)
{
}
else
{
/*if (this._TensorLayout == 1)
{
_DimOffset[0] = 1;
for(int idx = 1;idx < _DimOffset.Length;idx++)
_DimOffset[idx] = _DimOffset[idx-1] * this._Dimensions[idx-1];
}
else if ( _TensorLayout == 2)*/
{
_DimOffset[_DimOffset.Length-1] = 1;
for(int idx = _DimOffset.Length-1;idx >= 1;idx--)
_DimOffset[idx-1] = _DimOffset[idx] * this._Dimensions[idx];
}
}
}
public Shape(params int[] dims)
{
ReShape(dims);
}
public Shape(IEnumerable<int> shape) : this(shape.ToArray())
{
}
/// <summary>
/// get store position by shape
/// [[1, 2, 3], [4, 5, 6]]
/// GetIndexInShape(0, 1) = 1
/// GetIndexInShape(1, 1) = 5
/// </summary>
/// <param name="select"></param>
/// <returns></returns>
public int GetIndexInShape(params int[] select)
{
int idx = 0;
for (int i = 0; i < select.Length; i++)
idx += _DimOffset[i] * select[i];
return idx;
}
/// <summary>
/// get position in shape by store position
/// [[1, 2, 3], [4, 5, 6]]
/// GetDimIndexOutShape(1) = (0, 1)
/// GetDimIndexOutShape(4) = (1, 1)
/// </summary>
/// <param name="select"></param>
/// <returns></returns>
public int[] GetDimIndexOutShape(int select)
{
int[] dimIndexes = null;
if (this._DimOffset.Length == 1)
dimIndexes = new int[] {select};
/*else if (this._TensorLayout == 1)
{
int counter = select;
dimIndexes = new int[_DimOffset.Length];
for (int idx = _DimOffset.Length-1; idx > -1;idx--)
{
dimIndexes[idx] = counter / _DimOffset[idx];
counter -= dimIndexes[idx] * _DimOffset[idx];
}
}
else*/
{
int counter = select;
dimIndexes = new int[_DimOffset.Length];
for (int idx = 0; idx < _DimOffset.Length;idx++)
{
dimIndexes[idx] = counter / _DimOffset[idx];
counter -= dimIndexes[idx] * _DimOffset[idx];
}
}
return dimIndexes;
}
public void ChangeTensorLayout(int layout)
{
_DimOffset = new int[this._Dimensions.Length];
layout = (layout == 0) ? 1 : layout;
_TensorLayout = layout;
_SetDimOffset();
}
public void ReShape(params int[] dims)
{
this._Dimensions = dims;
this._DimOffset = new int[this._Dimensions.Length];
this._TensorLayout = 1;
this._size = 1;
for (int idx = 0; idx < dims.Length; idx++)
_size *= dims[idx];
this._SetDimOffset();
}
public static implicit operator int(Shape shape) => shape.Size;
public static implicit operator (int, int)(Shape shape) => shape._Dimensions.Length == 2 ? (shape._Dimensions[0], shape._Dimensions[1]) : (0, 0);
public static implicit operator (int, int, int) (Shape shape) => shape._Dimensions.Length == 3 ? (shape._Dimensions[0], shape._Dimensions[1], shape._Dimensions[2]) : (0, 0, 0);
public static implicit operator int[](Shape shape) => shape._Dimensions;
public (int, int) BiShape => _Dimensions.Length == 2 ? (_Dimensions[0], _Dimensions[1]) : (0, 0);
public (int, int, int) TriShape => _Dimensions.Length == 3 ? (_Dimensions[0], _Dimensions[1], _Dimensions[2]) : (0, 0, 0);
public static implicit operator Shape(int[] dims) => new Shape(dims);
public static implicit operator Shape(int dim) => new Shape(dim);
}
}