提交 d05c182e 编写于 作者: F fengjiayi 提交者: QI JUN

Add LoD's slice and append function (#5368)

* Add GetFineGrainedLoDLength and AppendLoD

* Follow comments and fix bugs

* fix a compile error

* fix a compile bug
上级 e7c67e11
......@@ -135,5 +135,43 @@ void LoDTensor::ShrinkInLevel(size_t level, size_t elem_begin,
PADDLE_ENFORCE_LT(begin, end, "Cannot shrink, the result tensor is empty.");
ShareDataWith(Slice(begin, end));
}
void GetFineGrainedLoDLength(const LoD& lod, size_t start_idx, size_t end_idx,
std::vector<std::vector<size_t>>* lod_length,
size_t* start_offset) {
lod_length->clear();
PADDLE_ENFORCE(start_idx < lod.size() - 1,
"start_idx should be >= 0 and < lod.size() - 1.");
PADDLE_ENFORCE(end_idx < lod.size(),
"end_idx should be >= 0 and < lod.size().");
PADDLE_ENFORCE_LE(start_idx, end_idx,
"start_idx should be less than end_idx.");
for (size_t level_idx = 0; level_idx < lod.size(); ++level_idx) {
std::vector<size_t> level_lens;
for (size_t i = start_idx; i < end_idx; ++i) {
level_lens.push_back(lod[level_idx][i + 1] - lod[level_idx][i]);
}
lod_length->emplace_back(level_lens);
start_idx = lod[level_idx][start_idx];
end_idx = lod[level_idx][end_idx];
}
*start_offset = start_idx;
}
void AppendLoD(LoD* lod, const std::vector<std::vector<size_t>>& lod_length) {
PADDLE_ENFORCE_EQ(
lod->size(), lod_length.size(),
"The lod_length should has the same size with the appended lod.");
for (size_t i = 0; i < lod->size(); ++i) {
auto& level = (*lod)[i];
if (level.empty()) {
level.push_back(0);
}
for (size_t len : lod_length[i]) {
level.push_back(level.back() + len);
}
}
}
} // namespace framework
} // namespace paddle
......@@ -181,5 +181,11 @@ LoDTensor LodExpand(const LoDTensor& source, const LoD& lod, size_t level,
return tensor;
}
void GetFineGrainedLoDLength(const LoD& lod, size_t start_idx, size_t end_idx,
std::vector<std::vector<size_t>>* lod_length,
size_t* start_offset);
void AppendLoD(LoD* lod, const std::vector<std::vector<size_t>>& lod_length);
} // namespace framework
} // namespace paddle
......@@ -144,5 +144,47 @@ TEST(LodExpand, test) {
}
}
TEST(LoD, GetFineGrainedLoDLength) {
LoD lod;
lod.push_back(std::vector<size_t>{0, 2, 4, 5});
lod.push_back(std::vector<size_t>{0, 1, 6, 8, 10, 11});
lod.push_back(
std::vector<size_t>{0, 2, 5, 7, 10, 12, 15, 17, 20, 24, 26, 29});
std::vector<std::vector<size_t>> lod_length;
size_t start_offset;
paddle::framework::GetFineGrainedLoDLength(lod, 1, 2, &lod_length,
&start_offset);
std::vector<std::vector<size_t>> expected;
expected.push_back(std::vector<size_t>{2});
expected.push_back(std::vector<size_t>{2, 2});
expected.push_back(std::vector<size_t>{2, 3, 4, 2});
EXPECT_EQ(lod_length, expected);
EXPECT_EQ(start_offset, 15UL);
}
TEST(LoD, AppendLoD) {
std::vector<std::vector<size_t>> lod_lens;
lod_lens.push_back(std::vector<size_t>{2});
lod_lens.push_back(std::vector<size_t>{2, 2});
lod_lens.push_back(std::vector<size_t>{2, 3, 4, 2});
LoD origin;
origin.push_back(std::vector<size_t>{0, 2});
origin.push_back(std::vector<size_t>{0, 1, 6});
origin.push_back(std::vector<size_t>{0, 2, 5, 7, 10, 12, 15});
paddle::framework::AppendLoD(&origin, lod_lens);
LoD expected;
expected.push_back(std::vector<size_t>{0, 2, 4});
expected.push_back(std::vector<size_t>{0, 1, 6, 8, 10});
expected.push_back(
std::vector<size_t>{0, 2, 5, 7, 10, 12, 15, 17, 20, 24, 26});
EXPECT_EQ(origin, expected);
}
} // namespace framework
} // namespace paddle
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