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diff --git a/compiler/ann-ref/src/ModelBuilder.h b/compiler/ann-ref/src/ModelBuilder.h
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+++ b/compiler/ann-ref/src/ModelBuilder.h
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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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 __MODEL_BUILDER_H__
+#define __MODEL_BUILDER_H__
+
+#include "NeuralNetworks.h"
+
+#include "Model.h"
+
+#include "Memory.h"
+#include "MemoryTracker.h"
+
+#include <vector>
+#include <memory>
+
+class CompilationBuilder;
+
+class ModelBuilder
+{
+public:
+  virtual ~ModelBuilder() = default;
+
+public:
+  // Adds an operand to the model.
+  int addOperand(const ANeuralNetworksOperandType &type);
+
+public:
+  int setOperandValue(uint32_t index, const void *buffer, size_t length);
+  int setOperandValueFromMemory(uint32_t index, const Memory *memory, uint32_t offset,
+                                size_t length);
+
+public:
+  int addOperation(OperationType type, uint32_t inputCount, const uint32_t *inputs,
+                   uint32_t outputCount, const uint32_t *outputs);
+
+public:
+  int identifyInputsAndOutputs(uint32_t inputCount, const uint32_t *inputs, uint32_t outputCount,
+                               const uint32_t *outputs);
+
+public:
+  int finish();
+  bool isFinished() const { return mCompletedModel; }
+
+public:
+  int createCompilation(CompilationBuilder **compilation);
+
+public:
+  void publish(Model *model) const;
+
+public:
+  uint32_t operandCount() const
+  {
+    // We don't allow more than uint32_t worth of operands
+    return static_cast<uint32_t>(mOperands.size());
+  }
+  uint32_t operationCount() const
+  {
+    // We don't allow more than uint32_t worth of operations
+    return static_cast<uint32_t>(mOperations.size());
+  }
+
+public:
+  uint32_t inputCount() const { return static_cast<uint32_t>(mInputIndexes.size()); }
+  uint32_t getInputOperandIndex(uint32_t i) const { return mInputIndexes[i]; }
+  const Operand &getInputOperand(uint32_t i) const { return mOperands[getInputOperandIndex(i)]; }
+
+public:
+  uint32_t outputCount() const { return static_cast<uint32_t>(mOutputIndexes.size()); }
+  uint32_t getOutputOperandIndex(uint32_t i) const { return mOutputIndexes[i]; }
+  const Operand &getOutputOperand(uint32_t i) const { return mOperands[getOutputOperandIndex(i)]; }
+
+public:
+  const Operand &getOperand(uint32_t index) const { return mOperands[index]; }
+  const Operation &getOperation(uint32_t index) const { return mOperations[index]; }
+
+public:
+  const MemoryTracker &getMemories() const { return mMemories; }
+  const std::vector<Operation> &getOperations() const { return mOperations; }
+
+private:
+  // Return true if either mCompleteModel or mInvalidModel is true.
+  bool badState(const char *name);
+
+  // Sorts the operations to be in the correct order for single threaded
+  // node-at-a-time execution.
+  void sortIntoRunOrder();
+
+  // Copies the large values to a shared memory, if we have any.
+  int copyLargeValuesToMemory();
+
+private:
+  // The operations of the graph.
+  std::vector<Operation> mOperations;
+  // The description of the operands of the graph.
+  std::vector<Operand> mOperands;
+
+  // Specifies where to find the list of indexes identifying
+  // the inputs and outputs of the model.  The offset is into
+  // the mOperandIndexes table.
+  std::vector<uint32_t> mInputIndexes;
+  std::vector<uint32_t> mOutputIndexes;
+
+  MemoryTracker mMemories;
+
+  // The value of the small operands that are defined at model
+  // creation time.
+  std::vector<uint8_t> mSmallOperandValues;
+
+  struct LargeValue
+  {
+    uint32_t operandIndex;
+    const void *buffer;
+  };
+  // Operand index and buffer pointer for all the large operand values of this model.
+  std::vector<LargeValue> mLargeOperandValues;
+  PrivateMemory mLargeValueMemory;
+
+  // Once the model has been finished, we should not allow further
+  // modifications to the model.
+  mutable bool mCompletedModel = false;
+
+  // Any invalid manipulation of the model will mark the model invalid.
+  // No further modifications are allowed to the model.
+  mutable bool mInvalidModel = false;
+};
+
+#endif // __MODEL_BUILDER_H__