remove reshape pair

mindspore/ccsrc/pre_activate/ascend/ascend_backend_optimization.cc

@@ -45,6 +45,7 @@
 #include "pre_activate/ascend/ir_fusion/mul_add_fusion.h"
 #include "pre_activate/ascend/ir_fusion/mul_addn_fusion.h"
 #include "pre_activate/ascend/ir_fusion/matmul_biasadd_fusion.h"
+#include "pre_activate/ascend/ir_fusion/remove_reshape_pair.h"
 #include "pre_activate/ascend/format_type/insert_trans_op.h"
 #include "pre_activate/pass/getitem_tuple.h"
 #include "pre_activate/pass/optimize_dependence.h"
@@ -113,6 +114,7 @@ void AscendDataLayout(const std::shared_ptr<session::KernelGraph> &kernel_graph)
   data_layout_pm->AddPass(std::make_shared<InsertTransOp>());
   data_layout_pm->AddPass(std::make_shared<GetitemTuple>());
   data_layout_pm->AddPass(std::make_shared<CommonSubexpressionElimination>());
+  data_layout_pm->AddPass(std::make_shared<RemoveReshapePair>());
   data_layout_pm->AddPass(std::make_shared<EliminateRedundantOp>());
   data_layout_pm->AddPass(std::make_shared<OptimizeDependence>());
   data_layout_pm->AddPass(std::make_shared<TransDataSplit>());

mindspore/ccsrc/pre_activate/ascend/ir_fusion/remove_reshape_pair.cc

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ *
+ * 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.
+ */
+
+#include "pre_activate/ascend/ir_fusion/remove_reshape_pair.h"
+#include <memory>
+#include "session/anf_runtime_algorithm.h"
+#include "utils/utils.h"
+#include "operator/ops.h"
+
+namespace mindspore {
+namespace opt {
+const BaseRef RemoveReshapePair::DefinePattern() const {
+  const auto prim_reshape = std::make_shared<Primitive>(prim::kPrimReshape->name());
+  VectorRef reshape({prim_reshape, input_varptr_});
+
+  return VectorRef({prim::kPrimReshape, reshape});
+}
+
+const AnfNodePtr RemoveReshapePair::Process(const FuncGraphPtr &func_graph, const AnfNodePtr &node,
+                                            const EquivPtr &equiv) const {
+  MS_EXCEPTION_IF_NULL(func_graph);
+  MS_EXCEPTION_IF_NULL(equiv);
+  auto manager = func_graph->manager();
+  MS_EXCEPTION_IF_NULL(manager);
+  auto reshape_op_1 = CheckAnfNodeIfCNodeAndInputSize(node, kBackendReshapeInputNum);
+  MS_EXCEPTION_IF_NULL(reshape_op_1);
+  // If reshape operator used by more than one other operators, reshape operator cant not be deleted  directly
+  auto users = manager->node_users()[reshape_op_1];
+  if (users.size() > 1) {
+    return nullptr;
+  }
+  auto reshape_op_2 = CheckAnfNodeIfCNodeAndInputSize(reshape_op_1->input(1), kBackendReshapeInputNum);
+  MS_EXCEPTION_IF_NULL(reshape_op_2);
+  users = manager->node_users()[reshape_op_2];
+  if (users.size() > 1) {
+    return nullptr;
+  }
+  auto input_node = reshape_op_2->input(1);
+  return input_node;
+}
+}  // namespace opt
+}  // namespace mindspore

mindspore/ccsrc/pre_activate/ascend/ir_fusion/remove_reshape_pair.h

@@ -0,0 +1,43 @@
+/**
+ * Copyright 2020 Huawei Technologies Co., Ltd
+ *
+ * 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.
+ */
+
+#ifndef MINDSPORE_CCSRC_PRE_ACTIVATE_ASCEND_IR_FUSION_REMOVE_RESHAPE_PAIR_H_
+#define MINDSPORE_CCSRC_PRE_ACTIVATE_ASCEND_IR_FUSION_REMOVE_RESHAPE_PAIR_H_
+
+#include <utility>
+#include <memory>
+#include "ir/anf.h"
+#include "pre_activate/common/pattern_engine.h"
+#include "pre_activate/common/helper.h"
+#include "pre_activate/common/optimizer.h"
+
+namespace mindspore {
+namespace opt {
+class RemoveReshapePair : public PatternProcessPass {
+ public:
+  explicit RemoveReshapePair(bool multigraph = true) : PatternProcessPass("remove_reshape_pair", multigraph) {
+    input_varptr_ = std::make_shared<Var>();
+  }
+  ~RemoveReshapePair() override = default;
+  const BaseRef DefinePattern() const override;
+  const AnfNodePtr Process(const FuncGraphPtr &, const AnfNodePtr &, const EquivPtr &) const override;
+
+ private:
+  VarPtr input_varptr_;
+};
+}  // namespace opt
+}  // namespace mindspore
+#endif  // MINDSPORE_CCSRC_PRE_ACTIVATE_ASCEND_IR_FUSION_REMOVE_RESHAPE_PAIR_H_