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2026-07-13 12:40:42 +08:00

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// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <ATen/Functions.h>
#include <ATen/core/TensorBody.h>
#include <ATen/cuda/EmptyTensor.h>
#include <ATen/native/cuda/Resize.h>
#include <ATen/ops/tensor.h>
#include <c10/core/Layout.h>
#include <c10/core/ScalarType.h>
#include <c10/core/SymInt.h>
#include <c10/core/TensorOptions.h>
#include <vector>
#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
#include <c10/cuda/CUDAFunctions.h>
#include <c10/cuda/CUDAGuard.h>
#endif
#include "ATen/ATen.h"
#include "gtest/gtest.h"
#include "paddle/phi/common/float16.h"
#include "torch/all.h"
// ============== at::zeros sparse tests ==============
TEST(SparseZerosTest, SparseCOO) {
// Dense tensor should return false
at::TensorBase tensor = at::zeros({2, 3}, at::kFloat);
ASSERT_FALSE(tensor.is_sparse());
ASSERT_EQ(tensor.layout(), c10::kStrided);
// Create sparse COO tensor
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparse);
at::TensorBase sparse_tensor = at::zeros({2, 3}, options);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
}
TEST(SparseZerosTest, SparseCsr) {
// Create sparse CSR tensor
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparseCsr);
at::TensorBase sparse_csr_tensor = at::zeros({2, 3}, options);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_TRUE(sparse_csr_tensor.is_sparse());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
TEST(SparseZerosTest, WithOptionalParams) {
// Test zeros with optional parameters
at::Tensor sparse_tensor = at::zeros(
{2, 3}, at::kFloat, at::kSparse, at::kCPU, /*pin_memory=*/false);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
at::Tensor sparse_csr_tensor = at::zeros(
{2, 3}, at::kFloat, at::kSparseCsr, at::kCPU, /*pin_memory=*/false);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
// ============== at::empty sparse tests ==============
TEST(SparseEmptyTest, SparseCOO) {
// Dense tensor should return false
at::TensorBase tensor = at::empty({2, 3}, at::kFloat);
ASSERT_FALSE(tensor.is_sparse());
ASSERT_EQ(tensor.layout(), c10::kStrided);
// Create sparse COO tensor
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparse);
at::TensorBase sparse_tensor = at::empty({2, 3}, options);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
}
TEST(SparseEmptyTest, SparseCsr) {
// Create sparse CSR tensor
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparseCsr);
at::TensorBase sparse_csr_tensor = at::empty({2, 3}, options);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_TRUE(sparse_csr_tensor.is_sparse());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
TEST(SparseEmptyTest, WithOptionalParams) {
// Test empty with optional parameters
at::Tensor sparse_tensor = at::empty({2, 3},
at::kFloat,
at::kSparse,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
at::Tensor sparse_csr_tensor = at::empty({2, 3},
at::kFloat,
at::kSparseCsr,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
// ============== at::empty_like sparse tests ==============
TEST(SparseEmptyLikeTest, SparseCOO) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Dense empty_like should return false
at::TensorBase tensor = at::empty_like(base_tensor);
ASSERT_FALSE(tensor.is_sparse());
ASSERT_EQ(tensor.layout(), c10::kStrided);
// Create sparse COO tensor using empty_like
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparse);
at::TensorBase sparse_tensor = at::empty_like(base_tensor, options);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
}
TEST(SparseEmptyLikeTest, SparseCsr) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Create sparse CSR tensor using empty_like
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparseCsr);
at::TensorBase sparse_csr_tensor = at::empty_like(base_tensor, options);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_TRUE(sparse_csr_tensor.is_sparse());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
TEST(SparseEmptyLikeTest, WithOptionalParams) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Test empty_like with optional parameters
at::Tensor sparse_tensor = at::empty_like(base_tensor,
at::kFloat,
at::kSparse,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
at::Tensor sparse_csr_tensor = at::empty_like(base_tensor,
at::kFloat,
at::kSparseCsr,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
// ============== at::zeros_like sparse tests ==============
TEST(SparseZerosLikeTest, SparseCOO) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Dense zeros_like should return false
at::TensorBase tensor = at::zeros_like(base_tensor);
ASSERT_FALSE(tensor.is_sparse());
ASSERT_EQ(tensor.layout(), c10::kStrided);
// Create sparse COO tensor using zeros_like
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparse);
at::TensorBase sparse_tensor = at::zeros_like(base_tensor, options);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
}
TEST(SparseZerosLikeTest, SparseCsr) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Create sparse CSR tensor using zeros_like
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparseCsr);
at::TensorBase sparse_csr_tensor = at::zeros_like(base_tensor, options);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_TRUE(sparse_csr_tensor.is_sparse());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
TEST(SparseZerosLikeTest, WithOptionalParams) {
at::Tensor base_tensor = at::ones({2, 3}, at::kFloat);
// Test zeros_like with optional parameters
at::Tensor sparse_tensor = at::zeros_like(base_tensor,
at::kFloat,
at::kSparse,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_tensor.is_sparse());
ASSERT_EQ(sparse_tensor.layout(), c10::kSparse);
at::Tensor sparse_csr_tensor = at::zeros_like(base_tensor,
at::kFloat,
at::kSparseCsr,
at::kCPU,
/*pin_memory=*/false,
/*memory_format=*/std::nullopt);
ASSERT_TRUE(sparse_csr_tensor.is_sparse_csr());
ASSERT_EQ(sparse_csr_tensor.layout(), c10::kSparseCsr);
}
// ============== at::sparse_coo_tensor tests ==============
TEST(SparseConstructorTest, SparseCooTensorBasic) {
// Create indices: 2D tensor of shape [sparse_dim, nnz]
// For a 3x4 sparse tensor with 2 non-zero elements at (0,1) and (2,3)
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0; // row index of first non-zero
indices_ptr[1] = 2; // row index of second non-zero
indices_ptr[2] = 1; // col index of first non-zero
indices_ptr[3] = 3; // col index of second non-zero
// Create values: tensor of shape [nnz]
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 1.0f;
values_ptr[1] = 2.0f;
// Create sparse COO tensor
at::Tensor sparse = at::sparse_coo_tensor(indices, values, {3, 4});
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
}
TEST(SparseConstructorTest, SparseCooTensorWithOptions) {
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 0;
indices_ptr[3] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 3.0f;
values_ptr[1] = 4.0f;
// Create with optional parameters
at::Tensor sparse = at::sparse_coo_tensor(indices,
values,
{2, 2},
at::kFloat,
at::kSparse,
at::kCPU,
/*pin_memory=*/false,
std::nullopt);
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
}
TEST(SparseConstructorTest, SparseCooTensorWithCoalescedOptionTrue) {
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 0;
indices_ptr[3] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
values.data_ptr<float>()[0] = 3.0f;
values.data_ptr<float>()[1] = 4.0f;
at::Tensor sparse =
at::sparse_coo_tensor(indices, values, {2, 2}, at::TensorOptions(), true);
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
ASSERT_TRUE(sparse.is_coalesced());
}
TEST(SparseConstructorTest, SparseCooTensorWithCoalescedOptionFalse) {
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 0;
indices_ptr[3] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
values.data_ptr<float>()[0] = 3.0f;
values.data_ptr<float>()[1] = 4.0f;
at::Tensor sparse = at::sparse_coo_tensor(
indices, values, {2, 2}, at::TensorOptions(), false);
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
ASSERT_FALSE(sparse.is_coalesced());
}
// ============== at::sparse_csr_tensor tests ==============
TEST(SparseConstructorTest, SparseCsrTensorBasic) {
// Create a 3x4 sparse CSR tensor with 4 non-zero elements:
// Row 0: values at columns 0, 2
// Row 1: value at column 1
// Row 2: value at column 3
// crow_indices: [0, 2, 3, 4] - compressed row pointers
at::Tensor crow_indices =
at::empty({4}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 2;
crow_ptr[2] = 3;
crow_ptr[3] = 4;
// col_indices: [0, 2, 1, 3] - column indices
at::Tensor col_indices =
at::empty({4}, c10::TensorOptions().dtype(at::kLong));
int64_t* col_ptr = col_indices.data_ptr<int64_t>();
col_ptr[0] = 0;
col_ptr[1] = 2;
col_ptr[2] = 1;
col_ptr[3] = 3;
// values: [1.0, 2.0, 3.0, 4.0]
at::Tensor values = at::empty({4}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 1.0f;
values_ptr[1] = 2.0f;
values_ptr[2] = 3.0f;
values_ptr[3] = 4.0f;
// Create sparse CSR tensor
at::Tensor sparse = at::sparse_csr_tensor(
crow_indices, col_indices, values, {3, 4}, at::TensorOptions());
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}
TEST(SparseConstructorTest, SparseCsrTensorWithOptions) {
// Create a simple 2x2 sparse CSR tensor
at::Tensor crow_indices =
at::empty({3}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 1;
crow_ptr[2] = 2;
at::Tensor col_indices =
at::empty({2}, c10::TensorOptions().dtype(at::kLong));
int64_t* col_ptr = col_indices.data_ptr<int64_t>();
col_ptr[0] = 0;
col_ptr[1] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 5.0f;
values_ptr[1] = 6.0f;
// Create with optional parameters
at::Tensor sparse = at::sparse_csr_tensor(crow_indices,
col_indices,
values,
{2, 2},
at::kFloat,
at::kSparseCsr,
at::kCPU,
/*pin_memory=*/false);
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}
TEST(SparseConstructorTest, SparseCsrTensorMismatchedOptionsDtypeIgnored) {
// PyTorch ignores dtype mismatch in sparse_csr_tensor;
// the resulting tensor uses values' original dtype.
at::Tensor crow_indices =
at::empty({3}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 1;
crow_ptr[2] = 2;
at::Tensor col_indices =
at::empty({2}, c10::TensorOptions().dtype(at::kLong));
int64_t* col_ptr = col_indices.data_ptr<int64_t>();
col_ptr[0] = 0;
col_ptr[1] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 5.0f;
values_ptr[1] = 6.0f;
std::vector<int64_t> size = {2, 2};
auto options = c10::TensorOptions().dtype(at::kDouble);
at::Tensor sparse =
at::sparse_csr_tensor(crow_indices, col_indices, values, size, options);
// Result should use values' dtype (float), not options' dtype (double).
ASSERT_EQ(sparse.dtype(), at::kFloat);
}
// ============== Additional sparse_coo_tensor tests ==============
TEST(SparseConstructorTest, SparseCooTensorInferSize) {
// Test sparse_coo_tensor with inferred size (no explicit size parameter)
at::Tensor indices = at::empty({2, 3}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
// 3 non-zero elements at (0,0), (1,1), (2,2)
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 2;
indices_ptr[3] = 0;
indices_ptr[4] = 1;
indices_ptr[5] = 2;
at::Tensor values = at::empty({3}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 1.0f;
values_ptr[1] = 2.0f;
values_ptr[2] = 3.0f;
// Create sparse COO tensor with inferred size
at::Tensor sparse = at::sparse_coo_tensor(indices, values);
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
ASSERT_EQ(sparse.dim(), 2);
ASSERT_EQ(sparse.size(0), 3);
ASSERT_EQ(sparse.size(1), 3);
}
TEST(SparseConstructorTest, SparseCooTensorInferSizeWithCoalescedOption) {
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0;
indices_ptr[1] = 2;
indices_ptr[2] = 1;
indices_ptr[3] = 3;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
values.data_ptr<float>()[0] = 1.0f;
values.data_ptr<float>()[1] = 2.0f;
at::Tensor sparse =
at::sparse_coo_tensor(indices, values, at::TensorOptions(), true);
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
ASSERT_EQ(sparse.size(0), 3);
ASSERT_EQ(sparse.size(1), 4);
ASSERT_TRUE(sparse.is_coalesced());
}
TEST(SparseConstructorTest, SparseCooTensorDouble) {
// Test sparse_coo_tensor with double dtype
at::Tensor indices = at::empty({2, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 0;
indices_ptr[3] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kDouble));
double* values_ptr = values.data_ptr<double>();
values_ptr[0] = 1.5;
values_ptr[1] = 2.5;
at::Tensor sparse = at::sparse_coo_tensor(indices, values, {2, 2});
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
}
TEST(SparseConstructorTest, SparseCooTensor3D) {
// Test 3D sparse COO tensor
at::Tensor indices = at::empty({3, 2}, c10::TensorOptions().dtype(at::kLong));
int64_t* indices_ptr = indices.data_ptr<int64_t>();
// 2 non-zero elements at (0,1,2) and (1,0,1)
indices_ptr[0] = 0;
indices_ptr[1] = 1;
indices_ptr[2] = 1;
indices_ptr[3] = 0;
indices_ptr[4] = 2;
indices_ptr[5] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 5.0f;
values_ptr[1] = 6.0f;
at::Tensor sparse = at::sparse_coo_tensor(indices, values, {2, 2, 3});
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparse);
}
// ============== Additional sparse_csr_tensor tests ==============
TEST(SparseConstructorTest, SparseCsrTensorDouble) {
// Test sparse_csr_tensor with double dtype
at::Tensor crow_indices =
at::empty({3}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 1;
crow_ptr[2] = 2;
at::Tensor col_indices =
at::empty({2}, c10::TensorOptions().dtype(at::kLong));
int64_t* col_ptr = col_indices.data_ptr<int64_t>();
col_ptr[0] = 0;
col_ptr[1] = 1;
at::Tensor values = at::empty({2}, c10::TensorOptions().dtype(at::kDouble));
double* values_ptr = values.data_ptr<double>();
values_ptr[0] = 1.5;
values_ptr[1] = 2.5;
at::Tensor sparse = at::sparse_csr_tensor(
crow_indices, col_indices, values, {2, 2}, at::TensorOptions());
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}
TEST(SparseConstructorTest, SparseCsrTensorLarger) {
// Test larger sparse CSR tensor (4x5 with 6 non-zero elements)
// Row 0: values at columns 1, 3
// Row 1: value at column 2
// Row 2: values at columns 0, 4
// Row 3: value at column 2
at::Tensor crow_indices =
at::empty({5}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 2;
crow_ptr[2] = 3;
crow_ptr[3] = 5;
crow_ptr[4] = 6;
at::Tensor col_indices =
at::empty({6}, c10::TensorOptions().dtype(at::kLong));
int64_t* col_ptr = col_indices.data_ptr<int64_t>();
col_ptr[0] = 1;
col_ptr[1] = 3;
col_ptr[2] = 2;
col_ptr[3] = 0;
col_ptr[4] = 4;
col_ptr[5] = 2;
at::Tensor values = at::empty({6}, c10::TensorOptions().dtype(at::kFloat));
float* values_ptr = values.data_ptr<float>();
values_ptr[0] = 1.0f;
values_ptr[1] = 2.0f;
values_ptr[2] = 3.0f;
values_ptr[3] = 4.0f;
values_ptr[4] = 5.0f;
values_ptr[5] = 6.0f;
at::Tensor sparse = at::sparse_csr_tensor(
crow_indices, col_indices, values, {4, 5}, at::TensorOptions());
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}
TEST(SparseConstructorTest, SparseCsrTensorEmpty) {
// Test sparse CSR tensor with no non-zero elements
at::Tensor crow_indices =
at::empty({4}, c10::TensorOptions().dtype(at::kLong));
int64_t* crow_ptr = crow_indices.data_ptr<int64_t>();
crow_ptr[0] = 0;
crow_ptr[1] = 0;
crow_ptr[2] = 0;
crow_ptr[3] = 0;
at::Tensor col_indices =
at::empty({0}, c10::TensorOptions().dtype(at::kLong));
at::Tensor values = at::empty({0}, c10::TensorOptions().dtype(at::kFloat));
at::Tensor sparse = at::sparse_csr_tensor(
crow_indices, col_indices, values, {3, 3}, at::TensorOptions());
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}
// ============== Sparse tensor interoperability tests ==============
TEST(SparseInteropTest, SparseCsrFromZeros) {
// Create sparse CSR tensor from zeros
auto options = c10::TensorOptions().dtype(at::kFloat).layout(at::kSparseCsr);
at::Tensor sparse = at::zeros({4, 4}, options);
ASSERT_TRUE(sparse.is_sparse_csr());
ASSERT_TRUE(sparse.is_sparse());
ASSERT_EQ(sparse.layout(), c10::kSparseCsr);
}