/* Copyright 2015 Google Inc. 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 <functional>
#include <memory>

#include "tensorflow/core/common_runtime/kernel_benchmark_testlib.h"
#include "tensorflow/core/framework/allocator.h"
#include "tensorflow/core/framework/graph.pb.h"
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/framework/tensor.h"
#include "tensorflow/core/framework/tensor_testutil.h"
#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/framework/types.pb.h"
#include "tensorflow/core/graph/node_builder.h"
#include "tensorflow/core/graph/testlib.h"
#include "tensorflow/core/kernels/ops_testutil.h"
#include "tensorflow/core/kernels/ops_util.h"
#include "tensorflow/core/lib/core/status_test_util.h"
#include "tensorflow/core/platform/test.h"
#include "tensorflow/core/platform/test_benchmark.h"
#include "tensorflow/core/util/strided_slice_op.h"

namespace tensorflow {
namespace {

// For the benchmark, we set up two 2-dimensional tensors, each kDim1 x 'dim'
// in size, and concat them together along "concat_dimension"
template <typename T>
static void SliceHelper(int iters, int size) {
  testing::StopTiming();
  Graph* g = new Graph(OpRegistry::Global());
  DataType dt = DataTypeToEnum<T>::v();
  int kDim = 100;
  int kMaxSize = 15000;
  CHECK_LT(size, kMaxSize);

  Tensor begin(DT_INT32, TensorShape({2}));
  begin.flat<int32>()(0) = 10;
  begin.flat<int32>()(1) = 10;

  Tensor end(DT_INT32, TensorShape({2}));
  end.flat<int32>()(0) = 10 + kDim;
  end.flat<int32>()(1) = 10 + size;

  Tensor strides(DT_INT32, TensorShape({2}));
  strides.flat<int32>()(0) = 1;
  strides.flat<int32>()(1) = 1;

  Tensor input(dt, TensorShape({2 * kDim, kMaxSize}));
  input.flat<T>().setRandom();

  Node* node;
  TF_CHECK_OK(NodeBuilder(g->NewName("n"), "StridedSlice")
                  .Input(test::graph::Constant(g, input))
                  .Input(test::graph::Constant(g, begin))
                  .Input(test::graph::Constant(g, end))
                  .Input(test::graph::Constant(g, strides))
                  .Attr("T", dt)
                  .Finalize(g, &node));

  testing::BytesProcessed(static_cast<int64>(iters) * kDim * size * sizeof(T));
  testing::StartTiming();
  test::Benchmark("cpu", g).Run(iters);
  testing::UseRealTime();
}

static void BM_SliceFloat(int iters, int dim2) {
  SliceHelper<float>(iters, dim2);
}

BENCHMARK(BM_SliceFloat)->Arg(100)->Arg(1000)->Arg(10000);

static void BM_SliceBFloat16(int iters, int dim2) {
  SliceHelper<bfloat16>(iters, dim2);
}

BENCHMARK(BM_SliceBFloat16)->Arg(100)->Arg(1000)->Arg(10000);

static void BM_ValidateStridedSliceOp(int iters) {
  testing::StopTiming();
  int kDim = 100;
  int kMaxSize = 15000;
  int size = 100;
  Tensor begin = test::AsTensor<int32>({10, 10});
  Tensor end = test::AsTensor<int32>({10 + kDim, 10 + size});
  Tensor strides = test::AsTensor<int32>({1, 1});
  TensorShape input_shape({2 * kDim, kMaxSize});

  testing::StartTiming();
  for (int i = 0; i < iters; ++i) {
    TensorShape processing_shape, final_shape;
    bool is_identity = true, slice_dim0 = true, is_simple_slice = true;
    gtl::InlinedVector<int64, 4> begin_out, end_out, strides_out;
    const int32 begin_mask = 0;
    const int32 end_mask = 0;
    const int32 ellipsis_mask = 0;
    const int32 new_axis_mask = 0;
    const int32 shrink_axis_mask = 0;

    ShapeReadWriteFromTensorShape wrapped_processing_shape(&processing_shape);
    ShapeReadWriteFromTensorShape wrapped_final_shape(&final_shape);
    TF_CHECK_OK(ValidateStridedSliceOp(
        begin, end, strides, ShapeReadWriteFromTensorShape(&input_shape),
        begin_mask, end_mask, ellipsis_mask, new_axis_mask, shrink_axis_mask,
        &wrapped_processing_shape, &wrapped_final_shape, &is_identity,
        &is_simple_slice, &slice_dim0, &begin_out, &end_out, &strides_out));
  }
}

BENCHMARK(BM_ValidateStridedSliceOp);

}  // namespace
}  // namespace tensorflow
