/* Copyright 2015 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 <random>

#include "tensorflow/core/common_runtime/kernel_benchmark_testlib.h"
#include "tensorflow/core/framework/tensor.h"
#include "tensorflow/core/kernels/xent_op.h"
#include "tensorflow/core/platform/test.h"
#include "tensorflow/core/platform/test_benchmark.h"

namespace tensorflow {

static Graph* SparseXent(int batch_size, int num_classes) {
  Graph* g = new Graph(OpRegistry::Global());
  Tensor logits(DT_FLOAT, TensorShape({batch_size, num_classes}));
  logits.flat<float>().setRandom();
  Tensor labels(DT_INT64, TensorShape({batch_size}));
  std::random_device rd;
  std::mt19937 gen(rd());
  std::uniform_int_distribution<> dist(0, num_classes - 1);
  auto labels_t = labels.flat<int64>();
  for (int i = 0; i < batch_size; ++i) {
    labels_t(i) = dist(gen);
  }
  test::graph::Binary(g, "SparseSoftmaxCrossEntropyWithLogits",
                      test::graph::Constant(g, logits),
                      test::graph::Constant(g, labels));
  return g;
}

#define BM_SparseXentDev(BATCH, CLASS, DEVICE)                          \
  static void BM_SparseXent##_##BATCH##_##CLASS##_##DEVICE(int iters) { \
    testing::ItemsProcessed(static_cast<int64>(iters) * BATCH * CLASS); \
    test::Benchmark(#DEVICE, SparseXent(BATCH, CLASS)).Run(iters);      \
  }                                                                     \
  BENCHMARK(BM_SparseXent##_##BATCH##_##CLASS##_##DEVICE);

/// The representative tests for ptb_word on GPU
BM_SparseXentDev(8, 1000000, gpu);

BM_SparseXentDev(16, 10000, gpu);
BM_SparseXentDev(16, 30000, gpu);
BM_SparseXentDev(16, 100000, gpu);

BM_SparseXentDev(32, 10000, gpu);
BM_SparseXentDev(32, 30000, gpu);
BM_SparseXentDev(32, 100000, gpu);

BM_SparseXentDev(64, 10000, gpu);
BM_SparseXentDev(64, 30000, gpu);
BM_SparseXentDev(64, 100000, gpu);

// CPU
BM_SparseXentDev(8, 1000000, cpu);

BM_SparseXentDev(16, 10000, cpu);
BM_SparseXentDev(16, 100000, cpu);

BM_SparseXentDev(32, 10000, cpu);
BM_SparseXentDev(32, 100000, cpu);

BM_SparseXentDev(64, 10000, cpu);
BM_SparseXentDev(64, 100000, cpu);

}  // end namespace tensorflow