[Tensor data()] Tensor support `void* data()` function (#50262)

* Tensor support void* data() function

* add unittest

* add selectedRows unittest

* polish unittest

* polish unittest

* polish unittest

* polish unittest

paddle/phi/api/include/tensor.h

@@ -347,6 +347,24 @@ class PADDLE_API Tensor final {
   template <typename T>
   T* data();
 
+  /**
+   * @brief Get the const memory pointer directly.
+   * It's usually used to get the output data pointer.
+   *
+   * @tparam T
+   * @return T*
+   */
+  const void* data() const;
+
+  /**
+   * @brief Get the memory pointer directly.
+   * It's usually used to get the mutable output data pointer.
+   *
+   * @tparam T
+   * @return T*
+   */
+  void* data();
+
   /**
    * @brief Return a sub-tensor of the given tensor.
    * It is usually used to extract a sub-tensor (which supports

paddle/phi/api/lib/tensor.cc

@@ -298,6 +298,26 @@ template PADDLE_API phi::dtype::complex<float>
 template PADDLE_API phi::dtype::complex<double>
     *Tensor::data<phi::dtype::complex<double>>();
 
+const void *Tensor::data() const {
+  if (is_dense_tensor()) {
+    return static_cast<phi::DenseTensor *>(impl_.get())->data();
+  } else if (is_selected_rows()) {
+    return static_cast<phi::SelectedRows *>(impl_.get())->value().data();
+  }
+  return nullptr;
+}
+
+void *Tensor::data() {
+  if (is_dense_tensor()) {
+    return static_cast<phi::DenseTensor *>(impl_.get())->data();
+  } else if (is_selected_rows()) {
+    return static_cast<phi::SelectedRows *>(impl_.get())
+        ->mutable_value()
+        ->data();
+  }
+  return nullptr;
+}
+
 // TODO(chenweihang): replace slice impl by API
 Tensor Tensor::slice(int64_t begin_idx, int64_t end_idx) const {
   if (is_dense_tensor()) {

paddle/phi/tests/api/CMakeLists.txt

@@ -2,17 +2,17 @@ if(WITH_GPU)
   nv_test(
     test_phi_tensor
     SRCS test_phi_tensor.cc
-    DEPS phi_tensor glog)
+    DEPS phi_tensor glog selected_rows)
 elseif(WITH_ROCM)
   hip_test(
     test_phi_tensor
     SRCS test_phi_tensor.cc
-    DEPS phi_tensor glog)
+    DEPS phi_tensor glog selected_rows)
 else()
   cc_test(
     test_phi_tensor
     SRCS test_phi_tensor.cc
-    DEPS phi_tensor glog)
+    DEPS phi_tensor glog selected_rows)
 endif()
 
 cc_test(

paddle/phi/tests/api/test_phi_tensor.cc

@@ -16,6 +16,7 @@
 #include "gtest/gtest.h"
 #include "paddle/phi/api/include/tensor.h"
 #include "paddle/phi/core/kernel_registry.h"
+#include "paddle/phi/core/selected_rows.h"
 
 namespace paddle {
 namespace tests {
@@ -208,6 +209,30 @@ void TestInitilized() {
   }
 }
 
+void TestDataInterface() {
+  // Test DenseTensor
+  experimental::Tensor test_tensor(paddle::PlaceType::kCPU, {1, 1});
+  CHECK(test_tensor.is_initialized() == true);
+  void* tensor_ptr = test_tensor.data();
+  CHECK(tensor_ptr != nullptr);
+  const void* const_tensor_ptr = test_tensor.data();
+  CHECK(const_tensor_ptr != nullptr);
+  // Test SelectedRows
+  std::vector<int64_t> rows = {0};
+  std::shared_ptr<phi::SelectedRows> selected_rows =
+      std::make_shared<phi::SelectedRows>(rows, 1);
+  selected_rows->mutable_value()->Resize(phi::make_ddim({1, 1}));
+  selected_rows->mutable_value()->mutable_data<float>(phi::CPUPlace())[0] =
+      static_cast<float>(10.0f);
+  paddle::experimental::Tensor sr_tensor =
+      paddle::experimental::Tensor(selected_rows);
+  CHECK(sr_tensor.is_initialized() == true);
+  tensor_ptr = sr_tensor.data();
+  CHECK(tensor_ptr != nullptr);
+  const_tensor_ptr = sr_tensor.data();
+  CHECK(const_tensor_ptr != nullptr);
+}
+
 void TestJudgeTensorType() {
   experimental::Tensor test_tensor(paddle::PlaceType::kCPU, {1, 1});
   CHECK(test_tensor.is_dense_tensor() == true);
@@ -228,6 +253,8 @@ TEST(PhiTensor, All) {
   GroupTestCast();
   VLOG(2) << "TestInitilized";
   TestInitilized();
+  VLOG(2) << "TestDataInterface";
+  TestDataInterface();
   VLOG(2) << "TestJudgeTensorType";
   TestJudgeTensorType();
 }