/* Copyright (c) 2022 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. */

#include "test/cpp/auto_parallel/spmd_rule_test_util.h"

namespace paddle {
namespace distributed {
namespace auto_parallel {

TEST(ExpandAsInferSpmd, Ctor) {
  // Sharding along axes besides softmax axis.
  std::vector<int64_t> x_shape = {1, 48};
  std::vector<int64_t> y_shape = {2, 32, 48};

  std::vector<int64_t> mesh_shape = {2, 3};
  std::vector<int64_t> process_ids = {0, 1, 2, 3, 4, 5};
  std::vector<std::string> dim_names = {"x", "y"};
  ProcessMesh process_mesh(mesh_shape, process_ids, dim_names);

  TensorDistAttr x_dist_attr = TensorDistAttr();
  x_dist_attr.set_process_mesh(process_mesh);
  x_dist_attr.set_dims_mapping(std::vector<int64_t>({-1, -1}));
  x_dist_attr.set_dynamic_dims(std::vector<bool>({false, false}));

  TensorDistAttr y_dist_attr = TensorDistAttr();
  y_dist_attr.set_process_mesh(process_mesh);
  y_dist_attr.set_dims_mapping(std::vector<int64_t>({0, 1, -1}));
  y_dist_attr.set_dynamic_dims(std::vector<bool>({false, false, false}));

  phi::distributed::DistMetaTensor x(phi::make_ddim(x_shape), x_dist_attr);
  phi::distributed::DistMetaTensor y(phi::make_ddim(y_shape), y_dist_attr);

  // test info forward
  auto spmdinfo = ExpandAsInferSpmd(x, y, y_shape);
  EXPECT_EQ(spmdinfo.first.size(), 2UL);
  EXPECT_EQ(spmdinfo.second.size(), 1UL);

  EXPECT_EQ(get_dims_mapping(spmdinfo.first[0]),
            std::vector<int64_t>({-1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.first[1]),
            std::vector<int64_t>({0, 1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.second[0]),
            std::vector<int64_t>({0, 1, -1}));
  EXPECT_DOUBLE_EQ(
      PADDLE_GET_CONST(TensorDistAttr, spmdinfo.second[0]).is_partial(), false);
  VLOG(4) << "Test ExpandAsInferSpmd" << std::endl << std::endl << std::endl;

  // test info forward without y
  // x [1, 48], target [2, 32, 48]: [-1, -1] -> [-1, -1, -1]
  spmdinfo = ExpandAsInferSpmd(x, phi::distributed::DistMetaTensor(), y_shape);
  EXPECT_EQ(spmdinfo.first.size(), 2UL);
  EXPECT_EQ(spmdinfo.second.size(), 1UL);

  EXPECT_EQ(get_dims_mapping(spmdinfo.first[0]),
            std::vector<int64_t>({-1, -1}));
  const phi::distributed::ArgDistAttr& attr = spmdinfo.first[1];
  if (paddle::holds_alternative<phi::distributed::TensorDistAttr>(attr)) {
    EXPECT_EQ(paddle::get<phi::distributed::TensorDistAttr>(attr),
              phi::distributed::TensorDistAttr());
  } else {
    FAIL() << "forward_info.first[1] is not TensorDistAttr";
  }
  EXPECT_EQ(get_dims_mapping(spmdinfo.second[0]),
            std::vector<int64_t>({-1, -1, -1}));
  EXPECT_DOUBLE_EQ(
      PADDLE_GET_CONST(TensorDistAttr, spmdinfo.second[0]).is_partial(), false);
  VLOG(4) << "Test ExpandAsInferSpmd" << std::endl << std::endl << std::endl;

  // test info reverse
  spmdinfo = ExpandAsInferSpmdReverse(x, y, y, y_shape);
  EXPECT_EQ(spmdinfo.first.size(), 2UL);
  EXPECT_EQ(spmdinfo.second.size(), 1UL);

  EXPECT_EQ(get_dims_mapping(spmdinfo.first[0]),
            std::vector<int64_t>({-1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.first[1]),
            std::vector<int64_t>({0, 1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.second[0]),
            std::vector<int64_t>({0, 1, -1}));
  EXPECT_DOUBLE_EQ(
      PADDLE_GET_CONST(TensorDistAttr, spmdinfo.second[0]).is_partial(), false);
  VLOG(4) << "Test ExpandAsInferSpmdReverse" << std::endl
          << std::endl
          << std::endl;

  // test info grad
  spmdinfo = ExpandAsGradInferSpmd(x, y, y_shape);
  EXPECT_EQ(spmdinfo.first.size(), 2UL);
  EXPECT_EQ(spmdinfo.second.size(), 1UL);

  EXPECT_EQ(get_dims_mapping(spmdinfo.first[0]),
            std::vector<int64_t>({-1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.first[1]),
            std::vector<int64_t>({0, 1, -1}));
  EXPECT_EQ(get_dims_mapping(spmdinfo.second[0]),
            std::vector<int64_t>({-1, -1}));
  check_partial_dims(spmdinfo.second[0], {0, 1});
  VLOG(4) << "Test ExpandAsGradInferSpmd" << std::endl
          << std::endl
          << std::endl;
}

}  // namespace auto_parallel
}  // namespace distributed
}  // namespace paddle