/* Copyright 2017 The TensorFlow 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 "absl/types/optional.h"
#include "tensorflow/compiler/xla/client/xla_computation.h"
#include "tensorflow/compiler/xla/execution_options_util.h"
#include "tensorflow/compiler/xla/service/bfloat16_normalization.h"
#include "tensorflow/compiler/xla/service/despecializer.h"
#include "tensorflow/compiler/xla/status_macros.h"
#include "tensorflow/compiler/xla/test.h"
#include "tensorflow/compiler/xla/tests/client_library_test_base.h"
#include "tensorflow/compiler/xla/tests/hlo_test_base.h"
#include "tensorflow/compiler/xla/tests/test_macros.h"

namespace xla {
namespace {

string GetFloatDataType(bool use_bfloat16) {
  return use_bfloat16 ? "bf16" : "f32";
}

struct BatchGroupedConvolution2DSpec {
  int64 output_batch, window, window_dilation;
  std::vector<int64> activation_dims;
  std::vector<int64> kernel_dims;
  std::vector<int64> output_dims;
  std::vector<int64> activation_and_kernel_layout;
  std::vector<int64> output_layout;
};

class BatchGroupedConvolution2DTest
    : public HloTestBase,
      public ::testing::WithParamInterface<
          ::testing::tuple<BatchGroupedConvolution2DSpec, bool>> {};

static std::vector<BatchGroupedConvolution2DSpec> GetConv2DTestCases() {
  std::vector<BatchGroupedConvolution2DSpec> config_set;
  std::vector<std::vector<int64>> config_options = {
      {8, 5, 3, 2},      {4, 5, 5, 2},    {8, 7, 4, 128},
      {16, 20, 20, 256}, {256, 7, 5, 4},  {256, 6, 6, 4},
      {256, 8, 8, 512},  {64, 7, 7, 960}, {64, 14, 14, 576}};

  for (auto option : config_options) {
    int64 feature = option[3];
    int64 activation_size = option[1];
    int64 kernel_size = option[2];
    int64 batch = option[0];

    BatchGroupedConvolution2DSpec config;
    config.window_dilation = 1;
    config.output_batch = feature;
    config.window = kernel_size;

    config.activation_dims = {batch, activation_size, activation_size, feature};

    config.kernel_dims = {batch, kernel_size, kernel_size, feature};

    int64 output_space_size = 3 + activation_size - kernel_size;
    config.output_dims = {output_space_size, output_space_size, feature, 1};

    config.activation_and_kernel_layout = {0, 3, 1, 2};
    config.output_layout = {2, 3, 0, 1};
    config_set.push_back(config);

    BatchGroupedConvolution2DSpec different_layout_config = config;
    different_layout_config.activation_and_kernel_layout = {3, 0, 1, 2};
    config_set.push_back(different_layout_config);

    // Add configurations for window dilation cases.
    if (activation_size % 2 == 0 && activation_size == kernel_size) {
      BatchGroupedConvolution2DSpec config;
      config.window_dilation = 2;
      config.output_batch = feature;
      config.window = kernel_size / 2;
      config.activation_dims = {batch, activation_size, activation_size,
                                feature};
      config.kernel_dims = {batch, kernel_size / 2, kernel_size / 2, feature};
      config.activation_and_kernel_layout = {0, 3, 1, 2};
      config.output_layout = {2, 3, 0, 1};

      int64 output_space_size = 5;
      config.output_dims = {output_space_size, output_space_size, feature, 1};

      config_set.push_back(config);

      BatchGroupedConvolution2DSpec different_layout_config = config;
      different_layout_config.activation_and_kernel_layout = {3, 0, 1, 2};
      config_set.push_back(different_layout_config);
    }
  }

  return config_set;
}

string BatchGroupedConvolution2DTestDataToString(
    const ::testing::TestParamInfo<
        ::testing::tuple<BatchGroupedConvolution2DSpec, bool>>& data) {
  const auto& spec = ::testing::get<0>(data.param);
  const string data_type = GetFloatDataType(::testing::get<1>(data.param));
  string str = absl::StrCat(
      "activation_dims_", absl::StrJoin(spec.activation_dims, "x"),
      "_kernel_dims_", absl::StrJoin(spec.kernel_dims, "x"),
      "_activation_layout_",
      absl::StrJoin(spec.activation_and_kernel_layout, "_"), "_output_dims_",
      absl::StrJoin(spec.output_dims, "x"), data_type, "_output_layout_",
      absl::StrJoin(spec.output_layout, "_"));

  // Test names are not allowed to contain the '-' character.
  absl::c_replace(str, '-', 'n');
  return str;
}

string BuildHloTextBatchGroupedConvolution2D(
    const BatchGroupedConvolution2DSpec& spec, bool use_bfloat16) {
  const string data_type = GetFloatDataType(use_bfloat16);
  return absl::StrFormat(
      R"(
    HloModule TensorFlowDepthwiseConv, is_scheduled=true

    ENTRY main {
      activation = %s[%s]{%s} parameter(0)
      kernel = %s[%s]{%s} parameter(1)
      ROOT conv = %s[%s]{%s} convolution(%s[%s]{%s} activation, %s[%s]{%s} kernel),
          window={size=%dx%d pad=1_%dx1_%d rhs_dilate=%dx%d}, dim_labels=f01b_i01o->01fb,
          batch_group_count=%d
    }
    )",
      data_type, absl::StrJoin(spec.activation_dims, ","),
      absl::StrJoin(spec.activation_and_kernel_layout, ","), data_type,
      absl::StrJoin(spec.kernel_dims, ","),
      absl::StrJoin(spec.activation_and_kernel_layout, ","), data_type,
      absl::StrJoin(spec.output_dims, ","),
      absl::StrJoin(spec.output_layout, ","), data_type,
      absl::StrJoin(spec.activation_dims, ","),
      absl::StrJoin(spec.activation_and_kernel_layout, ","), data_type,
      absl::StrJoin(spec.kernel_dims, ","),
      absl::StrJoin(spec.activation_and_kernel_layout, ","), spec.window,
      spec.window, spec.window_dilation, spec.window_dilation,
      spec.window_dilation, spec.window_dilation, spec.output_batch);
}

XLA_TEST_P(BatchGroupedConvolution2DTest, DoIt) {
  const BatchGroupedConvolution2DSpec& spec = ::testing::get<0>(GetParam());
  bool use_bfloat16 = ::testing::get<1>(GetParam());

#ifdef XLA_BACKEND_DOES_NOT_SUPPORT_BFLOAT16
  if (use_bfloat16) {
    return;
  }
#endif

  const string hlo_text =
      BuildHloTextBatchGroupedConvolution2D(spec, use_bfloat16);

  EXPECT_TRUE(RunAndCompareNoHloPasses(
      hlo_text, ErrorSpec{0.01, 0.01}, [](HloModule* module) -> Status {
        BFloat16MixedPrecisionRemoval remover;
        TF_RETURN_IF_ERROR(remover.Run(module).status());
        Despecializer despecializer;
        return despecializer.Run(module).status();
      }));
}

INSTANTIATE_TEST_CASE_P(
    BatchGroupedConvolution2DTestWithRandomIndices,
    BatchGroupedConvolution2DTest,
    ::testing::Combine(::testing::ValuesIn(GetConv2DTestCases()),
                       ::testing::Bool()),
    BatchGroupedConvolution2DTestDataToString);

}  // namespace
}  // namespace xla
