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[release/9.0-staging] fix stack 2x2 tensor along dimension 1 #110053

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[release/9.0-staging] fix stack 2x2 tensor along dimension 1 #110053

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4 changes: 2 additions & 2 deletions ...libraries/System.Numerics.Tensors/src/System/Numerics/Tensors/netcore/TensorExtensions.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -3456,7 +3456,7 @@ public static Tensor<T> StackAlongDimension<T>(int dimension, params ReadOnlySpa
Tensor<T>[] outputs = new Tensor<T>[tensors.Length];
for (int i = 0; i < tensors.Length; i++)
{
outputs[i] = Tensor.Unsqueeze(tensors[0], dimension);
outputs[i] = Tensor.Unsqueeze(tensors[i], dimension);
}
return Tensor.ConcatenateOnDimension<T>(dimension, outputs);
}
Expand Down Expand Up @@ -3494,7 +3494,7 @@ public static ref readonly TensorSpan<T> StackAlongDimension<T>(scoped ReadOnlyS
Tensor<T>[] outputs = new Tensor<T>[tensors.Length];
for (int i = 0; i < tensors.Length; i++)
{
outputs[i] = Tensor.Unsqueeze(tensors[0], dimension);
outputs[i] = Tensor.Unsqueeze(tensors[i], dimension);
}
return ref Tensor.ConcatenateOnDimension<T>(dimension, tensors, destination);
}
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21 changes: 21 additions & 0 deletions src/libraries/System.Numerics.Tensors/tests/TensorTests.cs
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Expand Up @@ -1074,6 +1074,27 @@ public static void TensorStackTests()
Assert.Equal(8, resultTensor[1, 3, 1]);
Assert.Equal(9, resultTensor[1, 4, 0]);
Assert.Equal(9, resultTensor[1, 4, 1]);

// stacking 2x2 tensors along dimention 1
Tensor<int> v1 = Tensor.Create([1, 2, 3, 4], [2, 2]);
Tensor<int> v2 = Tensor.Create([10, 20, 30, 40], [2, 2]);

resultTensor = Tensor.StackAlongDimension(1, [v1, v2]);

Assert.Equal(3, resultTensor.Rank);
Assert.Equal(2, resultTensor.Lengths[0]);
Assert.Equal(2, resultTensor.Lengths[1]);
Assert.Equal(2, resultTensor.Lengths[2]);

Assert.Equal(1, resultTensor[0, 0, 0]);
Assert.Equal(2, resultTensor[0, 0, 1]);
Assert.Equal(10, resultTensor[0, 1, 0]);
Assert.Equal(20, resultTensor[0, 1, 1]);

Assert.Equal(3, resultTensor[1, 0, 0]);
Assert.Equal(4, resultTensor[1, 0, 1]);
Assert.Equal(30, resultTensor[1, 1, 0]);
Assert.Equal(40, resultTensor[1, 1, 1]);
}

[Fact]
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