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diff --git a/reference_model/src/ops/scatter_gather.h b/reference_model/src/ops/scatter_gather.h
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+
+// Copyright (c) 2020, ARM Limited.
+//
+//    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 OPS_SCATTER_GATHER_H
+#define OPS_SCATTER_GATHER_H
+
+#include "graph_node.h"
+
+using namespace tosa;
+
+namespace TosaReference
+{
+
+// input and index can have different rank
+// and infer OutRank statically
+template <int InRank, int IndexRank, DType Dtype>
+class OpGather : public GraphNode
+{
+public:
+    OpGather(TosaAttributeBase* attribute_, TosaQuantInfoBase* qinfo_, uint64_t id_);
+    virtual ~OpGather();
+
+    virtual int checkTensorAttributes();
+    virtual int eval();
+
+    static constexpr int OutRank = InRank - 1 + IndexRank;
+    using InEigenType            = typename GetEigenType<Dtype>::type;
+    using OutEigenType           = typename GetEigenType<Dtype>::type;
+    using TIn                    = Eigen::Tensor<InEigenType, InRank>;
+    using TIndex                 = Eigen::Tensor<int32_t, IndexRank>;
+    using TOut                   = Eigen::Tensor<OutEigenType, OutRank>;
+
+protected:
+    TosaAxisAttribute* attribute;
+    TosaReference::TensorTemplate<TIn>* in;
+    TosaReference::TensorTemplate<TIndex>* index;
+    TosaReference::TensorTemplate<TOut>* out;
+};
+
+};    // namespace TosaReference
+
+#endif