public T ToScalar<T>()
{
unsafe
{
if (typeof(T).as_dtype() == this.dtype && this.dtype != TF_DataType.TF_STRING)
return Unsafe.Read<T>(this.buffer.ToPointer());
switch (this.dtype)
{
#if _REGEN
%foreach supported_numericals_TF_DataType,supported_numericals,supported_numericals_lowercase%
case TF_DataType.#1:
return Converts.ChangeType<T>(*(#3*) this.buffer);
%
#else
case TF_DataType.TF_UINT8:
return Converts.ChangeType<T>(*(byte*) this.buffer);
/// <summary>
/// Return a 2-D array with ones on the diagonal and zeros elsewhere.
/// </summary>
/// <param name="N">Number of rows in the output.</param>
/// <param name="M">Number of columns in the output. If None, defaults to N.</param>
/// <param name="k">Index of the diagonal: 0 (the default) refers to the main diagonal, a positive value refers to an upper diagonal, and a negative value to a lower diagonal.</param>
/// <param name="dtype">Data-type of the returned array.</param>
/// <returns>An array where all elements are equal to zero, except for the k-th diagonal, whose values are equal to one.</returns>
/// <remarks>https://docs.scipy.org/doc/numpy/reference/generated/numpy.eye.html</remarks>
public static NDArray eye(int N, int?M = null, int k = 0, Type dtype = null)
{
if (!M.HasValue)
{
M = N;
}
var m = np.zeros(Shape.Matrix(N, M.Value), dtype ?? typeof(double));
if (k >= M)
{
return(m);
}
int i;
if (k >= 0)
{
i = k;
}
else
{
i = (-k) * M.Value;
}
var flat = m.flat;
var one = dtype != null?Converts.ChangeType(1d, dtype.GetTypeCode()) : 1d;
int skips = k < 0 ? Math.Abs(k) - 1 : 0;
for (int j = k; j < flat.size; j += N + 1)
{
if (j < 0 || skips-- > 0)
{
continue;
}
flat.SetAtIndex(one, j);
}
return(m);
}
public static NDArray Scalar <T>(object value) where T : unmanaged
{
return(new NDArray(UnmanagedStorage.Scalar(value as T? ?? Converts.ChangeType <T>(value, InfoOf <T> .NPTypeCode))));
}
/// <summary>
/// Return a new array of given shape and type, filled with fill_value.
/// </summary>
/// <param name="fill_value">Fill value.</param>
/// <param name="shape">Shape of the empty array, e.g., (2, 3) or 2.</param>
/// <param name="typeCode">The desired data-type for the array The default, null, means np.array(fill_value).dtype.</param>
/// <returns>Array of fill_value with the given shape, dtype, and order.</returns>
/// <remarks>https://docs.scipy.org/doc/numpy/reference/generated/numpy.full.html</remarks>
public static NDArray full(ValueType fill_value, Shape shape, NPTypeCode typeCode)
{
if (typeCode == NPTypeCode.Empty)
{
throw new ArgumentNullException(nameof(typeCode));
}
return(new NDArray(new UnmanagedStorage(ArraySlice.Allocate(typeCode, shape.size, Converts.ChangeType(fill_value, (TypeCode)typeCode)), shape)));
}
public static NDArray Scalar(object value, Type dtype)
{
return(new NDArray(UnmanagedStorage.Scalar(Converts.ChangeType(value, dtype.GetTypeCode()))));
}
/// <summary>
/// Scalar value
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public T randn <T>()
{
return((T)Converts.ChangeType(randomizer.NextDouble(), InfoOf <T> .NPTypeCode));
}
public override NDArray ReduceProduct(NDArray arr, int? axis_, bool keepdims = false, NPTypeCode? typeCode = null)
{
//in order to iterate an axis:
//consider arange shaped (1,2,3,4) when we want to summarize axis 1 (2nd dimension which its value is 2)
//the size of the array is [1, 2, n, m] all shapes after 2nd multiplied gives size
//the size of what we need to reduce is the size of the shape of the given axis (shape[axis])
var shape = arr.Shape;
if (shape.IsEmpty || shape.size==0)
return NDArray.Scalar(1, (typeCode ?? arr.typecode));
if (shape.IsScalar || (shape.size == 1 && shape.NDim == 1))
{
var r = NDArray.Scalar(typeCode.HasValue ? Converts.ChangeType(arr.GetAtIndex(0), typeCode.Value) : arr.GetAtIndex(0));
if (keepdims)
r.Storage.ExpandDimension(0);
return r;
}
if (axis_ == null)
{
var r = NDArray.Scalar(product_elementwise(arr, typeCode));
if (keepdims)
r.Storage.ExpandDimension(0);
else if (!r.Shape.IsScalar && r.Shape.size == 1 && r.ndim == 1)
r.Storage.Reshape(Shape.Scalar);
return r;
}
var axis = axis_.Value;
while (axis < 0)
axis = arr.ndim + axis; //handle negative axis
if (axis >= arr.ndim)
throw new ArgumentOutOfRangeException(nameof(axis));
if (shape[axis] == 1)
{
//if the given div axis is 1 and can be squeezed out.
if (keepdims)
return new NDArray(arr.Storage.Alias());
return np.squeeze_fast(arr, axis);
}
//handle keepdims
Shape axisedShape = Shape.GetAxis(shape, axis);
var retType = typeCode ?? (arr.GetTypeCode.GetAccumulatingType());
//prepare ret
var ret = new NDArray(retType, axisedShape, false);
var iterAxis = new NDCoordinatesAxisIncrementor(ref shape, axis);
var iterRet = new NDCoordinatesIncrementor(ref axisedShape);
var iterIndex = iterRet.Index;
var slices = iterAxis.Slices;
//resolve the accumulator type
#if _REGEN1
#region Compute
switch (arr.GetTypeCode)
{
%foreach supported_numericals,supported_numericals_lowercase%
case NPTypeCode.#1:
{
switch (retType)
{
%foreach supported_numericals,supported_numericals_lowercase,supported_numericals_onevales%
case NPTypeCode.#101:
{
do
{
var slice = arr[slices];
var iter = slice.AsIterator<#2>();
var moveNext = iter.MoveNext;
var hasNext = iter.HasNext;
|#102 sum = #103;
while (hasNext())
sum *= (#102) moveNext();
ret.Set#101(Converts.To#101(sum), iterIndex);
} while (iterAxis.Next() != null && iterRet.Next() != null);
break;
}
/// <summary>
/// Return a full array with the same shape and type as a given array.
/// </summary>
/// <param name="a">The shape and data-type of a define these same attributes of the returned array.</param>
/// <param name="fill_value">Fill value.</param>
/// <param name="dtype">Overrides the data type of the result.</param>
/// <returns>Array of fill_value with the same shape and type as a.</returns>
/// <remarks>https://docs.scipy.org/doc/numpy/reference/generated/numpy.full_like.html</remarks>
public static NDArray full_like(NDArray a, object fill_value, Type dtype = null)
{
var typeCode = (dtype ?? fill_value?.GetType() ?? a.dtype).GetTypeCode();
var shape = new Shape((int[])a.shape.Clone());
return(new NDArray(new UnmanagedStorage(ArraySlice.Allocate(typeCode, shape.size, Converts.ChangeType(fill_value, (TypeCode)typeCode)), shape)));
}
