chore: import upstream snapshot with attribution

test/cpp/compat/ATen_toString_test.cc

@@ -0,0 +1,78 @@
+// Copyright (c) 2025 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/CUDAContext.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>
+#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"
+
+TEST(TensorBaseTest, ToStringAPI) {
+  // Test toString() API
+  at::TensorBase cpu_float_tensor = at::ones({2, 3}, at::kFloat);
+  std::string cpu_float_str = cpu_float_tensor.toString();
+  ASSERT_EQ(cpu_float_str, "CPUFloatType");
+
+  at::TensorBase cpu_double_tensor = at::ones({2, 3}, at::kDouble);
+  std::string cpu_double_str = cpu_double_tensor.toString();
+  ASSERT_EQ(cpu_double_str, "CPUDoubleType");
+
+  at::TensorBase cpu_int_tensor = at::ones({2, 3}, at::kInt);
+  std::string cpu_int_str = cpu_int_tensor.toString();
+  ASSERT_EQ(cpu_int_str, "CPUIntType");
+
+  at::TensorBase cpu_long_tensor = at::ones({2, 3}, at::kLong);
+  std::string cpu_long_str = cpu_long_tensor.toString();
+  ASSERT_EQ(cpu_long_str, "CPULongType");
+
+  at::TensorBase cpu_bool_tensor = at::ones({2, 3}, at::kBool);
+  std::string cpu_bool_str = cpu_bool_tensor.toString();
+  ASSERT_EQ(cpu_bool_str, "CPUBoolType");
+
+  // Test undefined tensor
+  at::TensorBase undefined_tensor;
+  std::string undefined_str = undefined_tensor.toString();
+  ASSERT_EQ(undefined_str, "UndefinedType");
+
+#if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
+  // Test CUDA tensor if available
+  if (!at::cuda::is_available()) {
+    return;
+  }
+  at::TensorBase cuda_float_tensor = at::ones(
+      {2, 3},
+      at::TensorOptions().dtype(at::kFloat).device(at::Device(at::kCUDA, 0)));
+  std::string cuda_float_str = cuda_float_tensor.toString();
+  ASSERT_EQ(cuda_float_str, "CUDAFloatType");
+
+  at::TensorBase cuda_double_tensor = at::ones(
+      {2, 3},
+      at::TensorOptions().dtype(at::kDouble).device(at::Device(at::kCUDA, 0)));
+  std::string cuda_double_str = cuda_double_tensor.toString();
+  ASSERT_EQ(cuda_double_str, "CUDADoubleType");
+#endif
+}