解决 grad_fn next_functions api 接口导致内存异常的问题 - (#55627)

* [尝试] 给tensor增加一个属性, 这个属性是一个定值 1

* 暴露gradnode 并构建gradnode新的方法(用来测试)进行暴露给python python端可以访问

* 开发grad_fn、next_functions两个API 并暴露到python端- 做一些规范化处理

* 增加一个单元测试

* 优化 code-style

* 将单侧文件迁到正确的位置

* 优化 code-style

* 删除无用注释

* 解决 __main__ has no attribute

* 修改单侧文件

* 修改单侧脚本-temp

* 解决 grad_fn next_functions api 接口导致内存异常的问题

* 修改单测内容

* 解决 code-style 问题

paddle/fluid/pybind/eager_properties.cc

@@ -317,17 +317,16 @@ PyObject* tensor_properties_get_grad_fn(TensorObject* self, void* closure) {
 
   if (meta) {
     // Get the GradNode from meta
-    auto grad_node = meta->GradNode();  // Convert GradNode to a Python object
-    // The conversion will depend on the structure of GradNode.
-
-    if (!grad_node) {
+    auto grad_node_ptr = meta->GetMutableGradNode();
+    if (!grad_node_ptr) {
       Py_INCREF(Py_None);
       return Py_None;
     }
 
-    PyObject* py_grad_node = ToPyObject(grad_node);
+    PyObject* py_grad_node = ToPyObject(grad_node_ptr);
 
     return py_grad_node;
+
   } else {
     // If meta does not exist, return an appropriate Python object (e.g., None
     // or a special value).

paddle/fluid/pybind/eager_utils.cc

@@ -1006,10 +1006,9 @@ paddle::optional<paddle::Tensor> GetOptionalTensorFromArgs(
   }
 }
 
-PyObject* ToPyObject(egr::GradNodeBase* grad_node) {
+PyObject* ToPyObject(std::shared_ptr<egr::GradNodeBase> grad_node) {
   py::object py_obj = py::cast(grad_node, py::return_value_policy::reference);
-  py::handle py_handle = py::handle(py_obj);
-  PyObject* py_grad_node = py_handle.ptr();
+  PyObject* py_grad_node = py_obj.release().ptr();
   Py_INCREF(py_grad_node);
   return py_grad_node;
 }

paddle/fluid/pybind/eager_utils.h

@@ -126,7 +126,7 @@ PyObject* ToPyObject(
     const std::unordered_map<std::string, std::vector<std::string>>& value);
 PyObject* ToPyObject(const paddle::framework::Vocab& value);
 
-PyObject* ToPyObject(egr::GradNodeBase* grad_node);
+PyObject* ToPyObject(std::shared_ptr<egr::GradNodeBase> grad_node);
 
 class PyTensorHook : public egr::TensorHook {
  public:

paddle/fluid/pybind/pybind.cc

@@ -778,12 +778,24 @@ PYBIND11_MODULE(libpaddle, m) {
           }
         });
 
-  py::class_<egr::GradNodeBase>(m, "GradNodeBase")
-      .def("name", &egr::GradNodeBase::name)
-      .def_property_readonly("next_functions",
-                             &egr::GradNodeBase::NextFunctions)
-      .def("input_meta", &egr::GradNodeBase::InputMeta)
-      .def("output_meta", &egr::GradNodeBase::OutputMeta);
+  py::class_<egr::GradNodeBase, std::shared_ptr<egr::GradNodeBase>>(
+      m, "GradNodeBase")
+      .def("name",
+           [](const std::shared_ptr<egr::GradNodeBase> &self) {
+             return self->name();
+           })
+      .def_property_readonly(
+          "next_functions",
+          [](const std::shared_ptr<egr::GradNodeBase> &self) {
+            return self->NextFunctions();
+          })
+      .def("input_meta",
+           [](const std::shared_ptr<egr::GradNodeBase> &self) {
+             return self->InputMeta();
+           })
+      .def("output_meta", [](const std::shared_ptr<egr::GradNodeBase> &self) {
+        return self->OutputMeta();
+      });
 
 #if defined(PADDLE_WITH_CUDA) || defined(PADDLE_WITH_HIP)
   m.def("cudnn_version", &platform::DnnVersion);

test/legacy_test/test_grad_fn_and_next_functions.py

@@ -83,6 +83,11 @@ class TestAnonmousSurvey(unittest.TestCase):
             grad_fn_json (dict): grad_node_json of node
         """
         self.assertEqual(grad_fn.name(), grad_fn_json["func_name"])
+        # Recursively test other nodes
+        if hasattr(grad_fn, 'next_functions') and grad_fn.next_functions[0]:
+            next_funcs_json = grad_fn_json["next_funcs"]
+            for u in grad_fn.next_functions:
+                self.check_func(u, next_funcs_json[u.name()])
 
 
 if __name__ == "__main__":