text: /* Copyright (c) 2021 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 "paddle/pten/api/ext/exception.h"
  namespace paddle {
  namespace experimental {
  
  enum class DataLayout {
    UNDEFINED = 0,
    // TODO(chenweihang): keep ANY for compatibility, remove it later
    ANY = UNDEFINED,
    NHWC,
    NCHW,
    MKLDNN,
    NUM_DATA_LAYOUTS,
    // See Note [ Why we need ALL in baisc kernel key member? ]
    ALL_LAYOUT = UNDEFINED,
  };
  
  inline std::ostream& operator<<(std::ostream& os, DataLayout layout) {
    switch (layout) {
      case DataLayout::UNDEFINED:
        os << "Undefined";
        break;
      case DataLayout::NHWC:
        os << "NHWC";
        break;
      case DataLayout::NCHW:
        os << "NCHW";
        break;
      case DataLayout::MKLDNN:
        os << "MKLDNN";
        break;
      default:
        PD_THROW(
            "Invalid enum data layout type `", static_cast<int>(layout), "`.");
    }
    return os;
  }
  
  }  // namespace experimental
  }  // namespace paddle
  
  namespace pten {
  using DataLayout = paddle::experimental::DataLayout;
  }
  