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diff --git a/compiler/exo/src/Dialect/IR/CircleNodes.h b/compiler/exo/src/Dialect/IR/CircleNodes.h
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+++ b/compiler/exo/src/Dialect/IR/CircleNodes.h
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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 __LOCOEX_IR_CIRCLENODES_H__
+#define __LOCOEX_IR_CIRCLENODES_H__
+
+#include "CircleNodeDecl.h"
+#include "CircleOpcode.h"
+
+#include "FusedActFunc.h"
+#include "NodeMixins.h" // FixedArityNode
+
+#include <loco/IR/Node.h>
+
+namespace locoex
+{
+
+/// @brief enumeration of mixin class
+enum class CircleNodeTrait
+{
+  FusedActFunc,
+};
+
+template <CircleNodeTrait T> class CircleNodeMixin;
+
+template <> class CircleNodeMixin<CircleNodeTrait::FusedActFunc>
+{
+public:
+  CircleNodeMixin() = default;
+
+public:
+  FusedActFunc fusedActivationFunction() const { return _fused_act_fun; }
+  void fusedActivationFunction(FusedActFunc fused_act_fun) { _fused_act_fun = fused_act_fun; }
+
+private:
+  FusedActFunc _fused_act_fun = FusedActFunc::UNDEFINED;
+};
+
+/**
+ * @brief INSTANCE_NORM in circle
+ */
+class CircleInstanceNorm final
+    : public FixedArityNode<3, CircleNodeImpl<CircleOpcode::INSTANCE_NORM>>,
+      public CircleNodeMixin<CircleNodeTrait::FusedActFunc>
+{
+public:
+  /// @note  Currently only support FLOAT32 as input node
+  loco::Node *input(void) const { return at(0)->node(); }
+  void input(loco::Node *node) { at(0)->node(node); }
+
+  loco::Node *gamma(void) const { return at(1)->node(); }
+  void gamma(loco::Node *node) { at(1)->node(node); }
+
+  loco::Node *beta(void) const { return at(2)->node(); }
+  void beta(loco::Node *node) { at(2)->node(node); }
+
+  float epsilon() const { return _epsilon; }
+  void epsilon(float epsilon) { _epsilon = epsilon; }
+
+private:
+  float _epsilon = 1e-05;
+};
+
+} // namespace locoex
+
+#endif // __LOCOEX_IR_CIRCLENODES_H__