experiments/STT-tensorflow
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[XLA] Adds additional reference utility for R2 windowed reduction.

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Change: 146889081
This commit is contained in:
Tayo Oguntebi 2017-02-08 02:27:56 -08:00 committed by TensorFlower Gardener
parent 81430dc9bd
commit 6bbbd7e9d2
2 changed files with 44 additions and 0 deletions
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38
tensorflow/compiler/xla/reference_util.cc
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@ -134,6 +134,44 @@ ReferenceUtil::SeparableConvArray4D(const Array4D<float>& input,
return tensorflow::MathUtil::CeilOfRatio(unpadded_width, stride); return tensorflow::MathUtil::CeilOfRatio(unpadded_width, stride);
} }
/* static */ std::unique_ptr<Array2D<float>> ReferenceUtil::ReduceWindow2DAdd(
const Array2D<float>& operand, float init,
const tensorflow::gtl::ArraySlice<int64>& window,
const tensorflow::gtl::ArraySlice<int64>& stride, Padding padding) {
std::vector<int64> dim_lengths{operand.height(), operand.width()};
auto padding_both = xla::MakePadding(dim_lengths, window, stride, padding);
std::vector<int64> window_counts(window.size(), 0);
std::vector<int64> pad_low(window.size(), 0);
for (int64 i = 0; i < window.size(); ++i) {
window_counts[i] =
WindowCount(dim_lengths[i], window[i], stride[i], padding);
pad_low[i] = padding_both[i].first;
}
auto result = MakeUnique<Array2D<float>>(window_counts[0], window_counts[1]);
// Do a full 2D reduce window.
for (int64 i0 = 0; i0 < window_counts[0]; ++i0) {
for (int64 i1 = 0; i1 < window_counts[1]; ++i1) {
int64 i0_base = i0 * stride[0] - pad_low[0];
int64 i1_base = i1 * stride[1] - pad_low[1];
float val = init;
for (int64 i0_win = 0; i0_win < window[0]; ++i0_win) {
for (int64 i1_win = 0; i1_win < window[1]; ++i1_win) {
if (i0_base + i0_win >= 0 && i1_base + i1_win >= 0 &&
i0_base + i0_win < operand.n1() &&
i1_base + i1_win < operand.n2()) {
val += operand(i0_base + i0_win, i1_base + i1_win);
}
}
}
(*result)(i0, i1) = val;
}
}
return result;
}
/* static */ std::unique_ptr<Array4D<float>> ReferenceUtil::ReduceWindow4DAdd( /* static */ std::unique_ptr<Array4D<float>> ReferenceUtil::ReduceWindow4DAdd(
const Array4D<float>& operand, float init, const Array4D<float>& operand, float init,
const tensorflow::gtl::ArraySlice<int64>& window, const tensorflow::gtl::ArraySlice<int64>& window,

6
tensorflow/compiler/xla/reference_util.h
View File

@ -144,6 +144,12 @@ class ReferenceUtil {
static int64 WindowCount(int64 unpadded_width, int64 window_len, int64 stride, static int64 WindowCount(int64 unpadded_width, int64 window_len, int64 stride,
Padding padding); Padding padding);
// Performs a 2D window reduction with Add as the function to apply.
static std::unique_ptr<Array2D<float>> ReduceWindow2DAdd(
const Array2D<float>& operand, float init,
const tensorflow::gtl::ArraySlice<int64>& window,
const tensorflow::gtl::ArraySlice<int64>& stride, Padding padding);
// Performs a 4D window reduction with Add as the function to apply. // Performs a 4D window reduction with Add as the function to apply.
static std::unique_ptr<Array4D<float>> ReduceWindow4DAdd( static std::unique_ptr<Array4D<float>> ReduceWindow4DAdd(
const Array4D<float>& operand, float init, const Array4D<float>& operand, float init,