// Copyright (c) 2018 PaddlePaddle Authors. 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.

#pragma once

#include <vector>
#include "paddle/fluid/framework/scope.h"
#include "paddle/fluid/framework/var_desc.h"
#include "paddle/fluid/platform/enforce.h"

namespace paddle {
namespace imperative {

class VariableBase {
 public:
  VariableBase() {}
  virtual ~VariableBase() {}

  framework::VarDesc* var_desc_;
};

class Layer {
 public:
  virtual ~Layer() {}

  virtual std::vector<VariableBase> Forward(
      const std::vector<VariableBase>& inputs) {
    std::vector<VariableBase> vars;
    return vars;
  }

  virtual void Backward() { LOG(ERROR) << "backward at cpp."; }
};

}  // namespace imperative
}  // namespace paddle