chore: import upstream snapshot with attribution

test/cpp/eager/data_structure_tests/grad_node_test.h

@@ -0,0 +1,65 @@
+// Copyright (c) 2021 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.
+#pragma once
+#include "glog/logging.h"
+#include "gtest/gtest.h"
+#include "paddle/fluid/eager/autograd_meta.h"
+#include "paddle/fluid/eager/eager_tensor.h"
+#include "paddle/fluid/eager/grad_node_info.h"
+#include "paddle/phi/api/lib/utils/allocator.h"
+namespace egr {
+class TensorWrapper;
+}
+
+namespace eager_test {
+class GradTestNode : public egr::GradNodeBase {
+ public:
+  ~GradTestNode() override = default;
+  GradTestNode(float val, int in_num, int out_num)
+      : GradNodeBase(in_num, out_num), val_(val) {}
+  GradTestNode() : GradNodeBase() { val_ = 1.0; }
+  std::string name() override { return "GradTestNode"; }
+  paddle::small_vector<std::vector<paddle::Tensor>, egr::kSlotSmallVectorSize>
+  operator()(paddle::small_vector<std::vector<paddle::Tensor>,
+                                  egr::kSlotSmallVectorSize>& grads,  // NOLINT
+             bool create_graph = false,
+             bool is_new_grad = false) override {
+    val_ = std::dynamic_pointer_cast<phi::DenseTensor>(grads[0][0].impl())
+               ->data<float>()[0];
+    phi::DenseTensorMeta meta =
+        phi::DenseTensorMeta(phi::DataType::FLOAT32, common::make_ddim({1, 1}));
+    std::shared_ptr<phi::DenseTensor> dt = std::make_shared<phi::DenseTensor>(
+        std::make_unique<paddle::experimental::DefaultAllocator>(
+            phi::CPUPlace())
+            .get(),
+        meta);
+    auto* dt_ptr = dt->mutable_data<float>(phi::CPUPlace());
+    dt_ptr[0] = 6.0f;
+    paddle::Tensor et1(dt);
+    paddle::small_vector<std::vector<paddle::Tensor>, egr::kSlotSmallVectorSize>
+        res = {{et1}};
+    return res;
+  }
+  void ClearTensorWrappers() override { VLOG(6) << "Do nothing here now"; }
+
+  std::shared_ptr<GradNodeBase> Copy() const override {
+    {
+      auto copied_node = std::shared_ptr<GradTestNode>(new GradTestNode(*this));
+      return copied_node;
+    }
+  }
+
+  float val_;
+};
+}  // namespace eager_test