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Use IRootFunctions in Tensor.StdDev #110641

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Merged
merged 14 commits into from
Jan 29, 2025
Merged

Use IRootFunctions in Tensor.StdDev #110641

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236be30
Use IRootFunctions in Tensor.StdDev
lilinus Dec 12, 2024
25ab78b
Try fix api compat issue
lilinus Dec 13, 2024
76307a6
Replace Pow+Sum with SumOfSquares
lilinus Dec 13, 2024
ae0f95b
Drop IPowerFunctions constraint
lilinus Dec 13, 2024
3074fd9
Merge branch 'main' into tensor-stddev-use-root
lilinus Dec 13, 2024
b41b499
Try fix compatability supression
lilinus Dec 17, 2024
f4b265d
Fix StdDev stride issue
lilinus Dec 17, 2024
fd1e363
Add regression test
lilinus Dec 17, 2024
0d1e7c4
fix test
lilinus Dec 17, 2024
a153ded
Merge branch 'main' into tensor-stddev-use-root
lilinus Dec 17, 2024
aef2341
Use FlattenedLength in StdDev
lilinus Dec 17, 2024
85e8753
Try add byref to api compat supressions
lilinus Dec 18, 2024
e932133
Try fix type constraint
lilinus Dec 18, 2024
18a21d8
Merge branch 'main' into tensor-stddev-use-root
tannergooding Jan 27, 2025
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2 changes: 1 addition & 1 deletion src/libraries/System.Numerics.Tensors/ref/System.Numerics.Tensors.netcore.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -487,7 +487,7 @@ public static void ResizeTo<T>(scoped in System.Numerics.Tensors.Tensor<T> tenso
public static ref readonly System.Numerics.Tensors.TensorSpan<T> StackAlongDimension<T>(scoped System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors, in System.Numerics.Tensors.TensorSpan<T> destination, int dimension) { throw null; }
public static System.Numerics.Tensors.Tensor<T> Stack<T>(params scoped System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors) { throw null; }
public static ref readonly System.Numerics.Tensors.TensorSpan<T> Stack<T>(scoped in System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors, in System.Numerics.Tensors.TensorSpan<T> destination) { throw null; }
public static T StdDev<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x) where T : System.Numerics.IFloatingPoint<T>, System.Numerics.IPowerFunctions<T>, System.Numerics.IAdditionOperators<T, T, T>, System.Numerics.IAdditiveIdentity<T, T> { throw null; }
public static T StdDev<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x) where T : System.Numerics.IFloatingPoint<T>, System.Numerics.IPowerFunctions<T>, System.Numerics.IAdditionOperators<T, T, T>, System.Numerics.IAdditiveIdentity<T, T>, System.Numerics.IRootFunctions<T> { throw null; }
public static System.Numerics.Tensors.Tensor<T> Subtract<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, in System.Numerics.Tensors.ReadOnlyTensorSpan<T> y) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }
public static ref readonly System.Numerics.Tensors.TensorSpan<T> Subtract<T>(scoped in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, scoped in System.Numerics.Tensors.ReadOnlyTensorSpan<T> y, in System.Numerics.Tensors.TensorSpan<T> destination) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }
public static System.Numerics.Tensors.Tensor<T> Subtract<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, T y) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }
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13 changes: 2 additions & 11 deletions ...libraries/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/TensorExtensions.cs
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Expand Up @@ -3512,7 +3512,7 @@ public static ref readonly TensorSpan<T> StackAlongDimension<T>(scoped ReadOnlyS
/// <param name="x">The <see cref="TensorSpan{T}"/> to take the standard deviation of.</param>
/// <returns><typeparamref name="T"/> representing the standard deviation.</returns>
public static T StdDev<T>(in ReadOnlyTensorSpan<T> x)
where T : IFloatingPoint<T>, IPowerFunctions<T>, IAdditionOperators<T, T, T>, IAdditiveIdentity<T, T>
where T : IFloatingPoint<T>, IPowerFunctions<T>, IAdditionOperators<T, T, T>, IAdditiveIdentity<T, T>, IRootFunctions<T>
{
T mean = Average(x);
Span<T> span = MemoryMarshal.CreateSpan(ref x._reference, (int)x._shape._memoryLength);
Expand All @@ -3522,16 +3522,7 @@ public static T StdDev<T>(in ReadOnlyTensorSpan<T> x)
TensorPrimitives.Pow((ReadOnlySpan<T>)output, T.CreateChecked(2), output);
T sum = TensorPrimitives.Sum((ReadOnlySpan<T>)output);
T variance = sum / T.CreateChecked(x._shape._memoryLength);

if (typeof(T) == typeof(float))
{
return T.CreateChecked(MathF.Sqrt(float.CreateChecked(variance)));
}
if (typeof(T) == typeof(double))
{
return T.CreateChecked(Math.Sqrt(double.CreateChecked(variance)));
}
return T.Pow(variance, T.CreateChecked(0.5));
return T.Sqrt(variance);
}
#endregion

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