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Add Tensor.to_sparse() API for sparse COO tensor conversion #1525

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Add Tensor.to_sparse() API for sparse COO tensor conversion #1525

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31eda5c
Add Tensor.to_sparse() API for sparse COO tensor conversion
alinpahontu2912 Feb 13, 2026
ab45ebf
Merge branch 'main' into add-to-sparse-api
alinpahontu2912 Apr 7, 2026
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10 changes: 10 additions & 0 deletions src/Native/LibTorchSharp/THSTensor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1871,6 +1871,16 @@ Tensor THSTensor_to_dense(Tensor tensor)
CATCH_TENSOR(tensor->to_dense());
}

Tensor THSTensor_to_sparse(Tensor tensor)
{
CATCH_TENSOR(tensor->to_sparse());
}

Tensor THSTensor_to_sparse_with_dims(Tensor tensor, const int64_t sparse_dim)
{
CATCH_TENSOR(tensor->to_sparse(sparse_dim));
}

void THSTensor_set_(Tensor tensor, const Tensor source)
{
CATCH(tensor->set_(*source););
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3 changes: 3 additions & 0 deletions src/Native/LibTorchSharp/THSTensor.h
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Expand Up @@ -1396,6 +1396,9 @@ EXPORT_API(Tensor) THSTensor_trapezoid_dx(const Tensor y, const double dx, int64

EXPORT_API(Tensor) THSTensor_to_dense(Tensor tensor);

EXPORT_API(Tensor) THSTensor_to_sparse(Tensor tensor);
EXPORT_API(Tensor) THSTensor_to_sparse_with_dims(Tensor tensor, const int64_t sparse_dim);

EXPORT_API(Tensor) THSTensor_to_device(const Tensor tensor, const int device_type, const int device_index, const bool copy, const bool non_blocking);

EXPORT_API(Tensor) THSTensor_to_type(const Tensor tensor, int8_t scalar_type, const bool copy, const bool non_blocking);
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6 changes: 6 additions & 0 deletions src/TorchSharp/PInvoke/LibTorchSharp.THSTensor.cs
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Expand Up @@ -376,6 +376,12 @@ internal static extern IntPtr THSTensor_upsample_nearest3d(IntPtr input,
[DllImport("LibTorchSharp")]
internal static extern IntPtr THSTensor_to_dense(IntPtr handle);

[DllImport("LibTorchSharp")]
internal static extern IntPtr THSTensor_to_sparse(IntPtr handle);

[DllImport("LibTorchSharp")]
internal static extern IntPtr THSTensor_to_sparse_with_dims(IntPtr handle, long sparse_dim);

[DllImport("LibTorchSharp")]
internal static extern IntPtr THSTensor_clone(IntPtr handle);

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23 changes: 23 additions & 0 deletions src/TorchSharp/Tensor/Tensor.cs
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Expand Up @@ -1376,6 +1376,29 @@ public Tensor to_dense()
return new Tensor(res);
}

/// <summary>
/// Converts a dense tensor to a sparse COO tensor.
/// </summary>
public Tensor to_sparse()
{
var res = NativeMethods.THSTensor_to_sparse(Handle);
if (res == IntPtr.Zero)
CheckForErrors();
return new Tensor(res);
}

/// <summary>
/// Converts a dense tensor to a sparse COO tensor with the specified number of sparse dimensions.
/// </summary>
/// <param name="sparse_dim">The number of sparse dimensions.</param>
public Tensor to_sparse(int sparse_dim)
{
var res = NativeMethods.THSTensor_to_sparse_with_dims(Handle, sparse_dim);
if (res == IntPtr.Zero)
CheckForErrors();
return new Tensor(res);
}

/// <summary>
/// Returns a copy of the tensor input.
/// </summary>
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