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+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. 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.
+ */
+
+#ifndef __TF_ELTWISE_BINARY_CANONICALIZE_HELPER_H__
+#define __TF_ELTWISE_BINARY_CANONICALIZE_HELPER_H__
+
+#include <moco/IR/TFDialect.h>
+#include <moco/IR/TFNodes.h>
+
+#include "CanonicalEltwiseInputConnector.h"
+#include "BroadcastHelper.h"
+
+#include <loco/IR/Nodes.h>
+#include <loco/IR/NodeShape.h>
+#include <loco/Service/ShapeInference.h>
+
+#include <fipe.h>
+
+namespace
+{
+
+template <typename TFNodeT> struct EltwiseBinaryCanonicalizationRule;
+
+template <> struct EltwiseBinaryCanonicalizationRule<moco::TFAdd>
+{
+ using CanonicalNode = loco::EltwiseAdd;
+};
+
+template <> struct EltwiseBinaryCanonicalizationRule<moco::TFSub>
+{
+ using CanonicalNode = loco::EltwiseSub;
+};
+
+template <> struct EltwiseBinaryCanonicalizationRule<moco::TFMaximum>
+{
+ using CanonicalNode = loco::EltwiseMax;
+};
+
+template <> struct EltwiseBinaryCanonicalizationRule<moco::TFMul>
+{
+ using CanonicalNode = loco::EltwiseMul;
+};
+
+template <> struct EltwiseBinaryCanonicalizationRule<moco::TFRealDiv>
+{
+ using CanonicalNode = loco::EltwiseDiv;
+};
+
+template <typename TFNode> bool canonicalize_eltwise_binary_node(TFNode *node)
+{
+ auto graph = node->graph();
+
+ /**
+ * This will replace T/F Eltwise Binary node with a corresponding Canonical Eltwise node
+ *
+ * BEFORE
+ * A --- T/F Node --- C
+ * /
+ * B ----
+ *
+ * AFTER
+ * A --- T/F Node ---
+ * /
+ * B ----
+ *
+ * A --- [FixedReshape] --- [TensorBroadcast] --- Canonical Node -- C
+ * /
+ * B --- [FixedReshape] --- [TensorBroadcast] ----
+ *
+ * NOTE
+ * - [...] means optional node. They may or may not be created during this procedure.
+ * - T/F Node is disconnected from C after transformation.
+ */
+
+ using CanonicalNodeT = typename EltwiseBinaryCanonicalizationRule<TFNode>::CanonicalNode;
+
+ auto node_A = node->x();
+ auto node_B = node->y();
+
+ if (!loco::shape_known(node_A) || !loco::shape_known(node_B))
+ return false;
+ if (!loco::shape_known(node))
+ return false;
+
+ auto out_shape = loco::shape_get(node).template as<loco::TensorShape>();
+
+ // Create a node
+ auto canonical_node = graph->nodes()->template create<CanonicalNodeT>();
+
+ using moco::tf::eltwise::binary::connect_to;
+ using moco::tf::broadcast_to;
+
+ // update connections
+ std::make_pair(node_A, node_B) | broadcast_to(out_shape) | connect_to(canonical_node);
+
+ // replace node
+ replace(node).with(canonical_node);
+
+ return true;
+}
+
+} // namespace
+
+#endif // __TF_ELTWISE_BINARY_CANONICALIZE_HELPER_H__