refine python call error report (#47724)

* refine python call error report

paddle/fluid/eager/saved_tensors_hooks.cc

@@ -36,6 +36,9 @@ void* PackHook::operator()(const paddle::experimental::Tensor& tensor) {
   auto args = PyTuple_New(1);
   PyTuple_SET_ITEM(args, 0, paddle::pybind::ToPyObject(tensor));
   PyObject* ret = PyObject_Call(hook_, args, nullptr);
+  PADDLE_ENFORCE_NOT_NULL(ret,
+                          paddle::platform::errors::External(
+                              pybind11::detail::error_string().c_str()));
   Py_XDECREF(args);
   egr::Controller::Instance().SetHasGrad(grad_tmp);
   return reinterpret_cast<void*>(ret);
@@ -49,6 +52,9 @@ void* PackHook::operator()(void* py_tensor) {
   Py_INCREF(reinterpret_cast<PyObject*>(py_tensor));
   PyTuple_SET_ITEM(args, 0, reinterpret_cast<PyObject*>(py_tensor));
   PyObject* ret = PyObject_Call(hook_, args, nullptr);
+  PADDLE_ENFORCE_NOT_NULL(ret,
+                          paddle::platform::errors::External(
+                              pybind11::detail::error_string().c_str()));
   Py_XDECREF(args);
   egr::Controller::Instance().SetHasGrad(grad_tmp);
   return reinterpret_cast<void*>(ret);
@@ -69,6 +75,9 @@ paddle::experimental::Tensor UnPackHook::operator()(void* packed_value) {
   Py_INCREF(reinterpret_cast<PyObject*>(packed_value));
   PyTuple_SET_ITEM(args, 0, reinterpret_cast<PyObject*>(packed_value));
   PyObject* ret = PyObject_Call(hook_, args, nullptr);
+  PADDLE_ENFORCE_NOT_NULL(ret,
+                          paddle::platform::errors::External(
+                              pybind11::detail::error_string().c_str()));
   Py_XDECREF(args);
   egr::Controller::Instance().SetHasGrad(grad_tmp);
 
@@ -91,6 +100,9 @@ void* UnPackHook::operator()(void* packed_value, void* other) {
   Py_INCREF(reinterpret_cast<PyObject*>(packed_value));
   PyTuple_SET_ITEM(args, 0, reinterpret_cast<PyObject*>(packed_value));
   PyObject* ret = PyObject_Call(hook_, args, nullptr);
+  PADDLE_ENFORCE_NOT_NULL(ret,
+                          paddle::platform::errors::External(
+                              pybind11::detail::error_string().c_str()));
   Py_XDECREF(args);
   egr::Controller::Instance().SetHasGrad(grad_tmp);
 

paddle/fluid/pybind/eager_py_layer.cc

@@ -139,6 +139,8 @@ PyObject* pylayer_method_apply(PyObject* cls,
   PyLayerObject* ctx = reinterpret_cast<PyLayerObject*>(
       PyObject_CallFunctionObjArgs(backward_function, nullptr));
   if (!ctx) {
+    PADDLE_THROW(paddle::platform::errors::External(
+        pybind11::detail::error_string().c_str()));
     return nullptr;
   }
   VLOG(6) << "PyLayer construct PyLayerContext finish...";

paddle/fluid/pybind/eager_utils.cc

@@ -1525,8 +1525,8 @@ paddle::experimental::Tensor PyTensorHook::operator()(
   }
 
   PADDLE_ENFORCE_NOT_NULL(res,
-                          platform::errors::Unavailable(
-                              "Hook function of Tensor return a nullptr."));
+                          paddle::platform::errors::External(
+                              pybind11::detail::error_string().c_str()));
   if (res == Py_None) {
     return var;
   }