dummy.hpp

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// Copyright (c) 2014-2023, Lawrence Livermore National Security, LLC.
// Produced at the Lawrence Livermore National Laboratory.
// Written by the LBANN Research Team (B. Van Essen, et al.) listed in
// the CONTRIBUTORS file. <lbann-dev@llnl.gov>
//
// LLNL-CODE-697807.
// All rights reserved.
//
// This file is part of LBANN: Livermore Big Artificial Neural Network
// Toolkit. For details, see http://software.llnl.gov/LBANN or
// https://github.com/LLNL/LBANN.
//
// Licensed under the Apache License, Version 2.0 (the "Licensee"); 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 LBANN_LAYER_DUMMY_HPP_INCLUDED
#define LBANN_LAYER_DUMMY_HPP_INCLUDED

#include "lbann/layers/data_type_layer.hpp"

namespace lbann {

template <typename TensorDataType,
          data_layout T_layout = data_layout::DATA_PARALLEL,
          El::Device Dev = El::Device::CPU>
class dummy_layer : public data_type_layer<TensorDataType>
{
public:
  using AbsDistMatrixType = El::AbstractDistMatrix<TensorDataType>;

  dummy_layer(lbann_comm* comm) : data_type_layer<TensorDataType>(comm)
  {
    this->m_expected_num_child_layers = 0;
    this->m_error_signal = nullptr;
  }
  dummy_layer(const dummy_layer& other) : data_type_layer<TensorDataType>(other)
  {
    this->m_expected_num_child_layers = other.m_expected_num_child_layers;
    this->m_error_signal = nullptr;
  }
  dummy_layer* copy() const override { return new dummy_layer(*this); }

  void set_error_signal(std::unique_ptr<AbsDistMatrixType> signal);


  template <typename ArchiveT>
  void serialize(ArchiveT& ar);


  std::string get_type() const override { return "dummy"; }
  data_layout get_data_layout() const override { return T_layout; }
  El::Device get_device_allocation() const override { return Dev; }
  bool can_run_inplace() const override { return false; }
  int get_backprop_requirements() const override { return ERROR_SIGNALS; }

#ifdef LBANN_HAS_ONNX
  void fill_onnx_node(onnx::GraphProto& graph) const override {}
#endif // LBANN_HAS_ONNX

protected:
  void write_specific_proto(lbann_data::Layer& proto) const final;

  friend class cereal::access;
  dummy_layer() : dummy_layer(nullptr) {}

  void fp_compute() override {}
  void bp_compute() override;

  std::unique_ptr<AbsDistMatrixType> m_error_signal;
};

#ifndef LBANN_DUMMY_LAYER_INSTANTIATE
#define PROTO_DEVICE(T, Device)                                                \
  extern template class dummy_layer<T, data_layout::DATA_PARALLEL, Device>;    \
  extern template class dummy_layer<T, data_layout::MODEL_PARALLEL, Device>

#include "lbann/macros/instantiate_device.hpp"
#undef PROTO_DEVICE
#endif // LBANN_DUMMY_LAYER_INSTANTIATE

} // namespace lbann

#endif // LBANN_LAYER_DUMMY_HPP_INCLUDED