Eanble stack operator for a Ngraph, test=develop (#17406)

paddle/fluid/operators/ngraph/ops/stack_op.h

+/*Copyright (c) 2019 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 <memory>
+#include <string>
+#include <unordered_map>
+#include <vector>
+#include "ngraph/ngraph.hpp"
+#include "paddle/fluid/operators/ngraph/ops/op_bridge.h"
+#include "paddle/fluid/platform/ngraph_helper.h"
+
+namespace paddle {
+namespace operators {
+namespace ngraphs {
+
+void BuildStackNode(
+    const std::shared_ptr<framework::OperatorBase>& op,
+    std::shared_ptr<
+        std::unordered_map<std::string, std::shared_ptr<ngraph::Node>>>
+        ngb_node_map) {
+  auto op_attrs = framework::AttrReader(op->Attrs());
+  auto axis = op_attrs.Get<int>("axis");
+  std::vector<std::shared_ptr<ngraph::Node>> args;
+  for (auto& var_name_item : op->Inputs()) {
+    for (auto& var_name : var_name_item.second) {
+      auto& node = ngb_node_map->at(var_name);
+      auto shape = node->get_shape();
+      axis = (axis < 0) ? axis + shape.size() + 1 : axis;
+      shape.insert(shape.begin() + axis, 1);
+      std::vector<size_t> input_order(shape.size() - 1);
+      std::iota(std::begin(input_order), std::end(input_order), 0);
+      args.push_back(std::make_shared<ngraph::op::Reshape>(
+          node, ngraph::AxisVector(input_order), shape));
+    }
+  }
+  auto out = std::make_shared<ngraph::op::Concat>(args, axis);
+  platform::SetOutputNode(op, "Y", out, ngb_node_map);
+}
+}  // namespace ngraphs
+}  // namespace operators
+}  // namespace paddle
+
+REGISTER_NG_OP(stack, BuildStackNode);

python/paddle/fluid/tests/unittests/ngraph/test_stack_ngraph_op.py

+# Copyright (c) 2019 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.
+
+from __future__ import print_function
+
+import unittest, sys
+sys.path.append("../")
+from test_stack_op import TestStackOpBase, TestStackOp1, TestStackOp2, TestStackOp3, TestStackOp4, TestStackOp5, TestStackOp6
+
+if __name__ == '__main__':
+    unittest.main()