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Segmented Min/Max for Fixed Point Types #10794

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merged 17 commits into from
May 18, 2022
Merged

Segmented Min/Max for Fixed Point Types #10794

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f94ae1e
Add simple test case
isVoid May 4, 2022
abc8a4b
Add decimal code path and basic test.
isVoid May 4, 2022
17809e2
update segmented_reduce to use output iterator
isVoid May 4, 2022
8eeb5e3
Updating fixed point code path to work with new segmented reduce
isVoid May 4, 2022
f6ecf7e
Update fixed width and string code path
isVoid May 4, 2022
6a36115
Add coverage for min and exclude nulls
isVoid May 4, 2022
861de62
Removes memory resource from `segmented_reduce`
isVoid May 4, 2022
0031acf
Updates to docstrings
isVoid May 4, 2022
d57e79b
Remove return in docstring
isVoid May 4, 2022
bd17229
allocate result column based on fixed point type
isVoid May 4, 2022
e785c49
Update the order output iterator
isVoid May 11, 2022
e0c4b27
Adopt to full iterator based API
isVoid May 11, 2022
0779e46
Remove IILE
isVoid May 11, 2022
27f80f6
Move tparams to match params order
isVoid May 13, 2022
1088efb
Fix docstrings.
bdice May 13, 2022
c6f0c9c
Add tests with non-nullable inputs.
isVoid May 16, 2022
9fbaf2c
Merge branch 'fea/segmented_reduction_decimal_minmax' of github.com:i…
isVoid May 16, 2022
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62 changes: 30 additions & 32 deletions cpp/include/cudf/detail/reduction.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -229,48 +229,47 @@ std::unique_ptr<scalar> reduce(InputIterator d_in,
*
* @tparam InputIterator the input column iterator
* @tparam OffsetIterator the offset column iterator
* @tparam OutputIterator the output column iterator
* @tparam BinaryOp the device binary operator used to reduce
* @tparam OutputType the output type of reduction
*
* @param[in] d_in the begin iterator to input
* @param[in] d_offset the begin iterator to offset
* @param[in] num_segments the number of segments
* @param[in] d_offset_begin the begin iterator to offset
* @param[in] d_offset_end the end iterator to offset. Note: This is
* num_segments+1 elements past `d_offset_begin`.
* @param[out] d_out the begin iterator to output
* @param[in] binary_op the reduction operator
* @param[in] identity the identity element of the reduction operator
* @param[in] stream CUDA stream used for device memory operations and kernel launches.
* @param[in] mr Device memory resource used to allocate the returned column's device
* memory
* @returns Output column in device memory
*
*/
template <typename InputIterator,
typename OffsetIterator,
typename OutputIterator,
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typename BinaryOp,
typename OutputType = typename thrust::iterator_value<InputIterator>::type,
typename OutputType = typename thrust::iterator_value<OutputIterator>::type,
typename std::enable_if_t<is_fixed_width<OutputType>() &&
!cudf::is_fixed_point<OutputType>()>* = nullptr>
std::unique_ptr<column> segmented_reduce(InputIterator d_in,
OffsetIterator d_offset,
cudf::size_type num_segments,
BinaryOp binary_op,
OutputType identity,
rmm::cuda_stream_view stream,
rmm::mr::device_memory_resource* mr)
void segmented_reduce(InputIterator d_in,
OffsetIterator d_offset_begin,
OffsetIterator d_offset_end,
OutputIterator d_out,
BinaryOp binary_op,
OutputType identity,
rmm::cuda_stream_view stream)
{
auto dev_result = make_fixed_width_column(
data_type{type_to_id<OutputType>()}, num_segments, mask_state::UNALLOCATED, stream, mr);
auto dev_result_mview = dev_result->mutable_view();
auto num_segments = static_cast<size_type>(std::distance(d_offset_begin, d_offset_end)) - 1;

// Allocate temporary storage
rmm::device_buffer d_temp_storage;
size_t temp_storage_bytes = 0;
cub::DeviceSegmentedReduce::Reduce(d_temp_storage.data(),
temp_storage_bytes,
d_in,
dev_result_mview.data<OutputType>(),
d_out,
num_segments,
d_offset,
d_offset + 1,
d_offset_begin,
d_offset_begin + 1,
binary_op,
identity,
stream.value());
Expand All @@ -280,30 +279,29 @@ std::unique_ptr<column> segmented_reduce(InputIterator d_in,
cub::DeviceSegmentedReduce::Reduce(d_temp_storage.data(),
temp_storage_bytes,
d_in,
dev_result_mview.data<OutputType>(),
d_out,
num_segments,
d_offset,
d_offset + 1,
d_offset_begin,
d_offset_begin + 1,
binary_op,
identity,
stream.value());

return dev_result;
}

template <typename InputIterator,
typename OffsetIterator,
typename OutputIterator,
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typename BinaryOp,
typename OutputType = typename thrust::iterator_value<InputIterator>::type,
typename OutputType = typename thrust::iterator_value<OutputIterator>::type,
typename std::enable_if_t<!(is_fixed_width<OutputType>() &&
!cudf::is_fixed_point<OutputType>())>* = nullptr>
std::unique_ptr<column> segmented_reduce(InputIterator,
OffsetIterator,
cudf::size_type,
BinaryOp,
OutputType,
rmm::cuda_stream_view,
rmm::mr::device_memory_resource*)
void segmented_reduce(InputIterator,
OffsetIterator,
OffsetIterator,
OutputIterator,
BinaryOp,
OutputType,
rmm::cuda_stream_view)
{
CUDF_FAIL(
"Unsupported data types called on segmented_reduce. Only numeric and chrono types are "
Expand Down
107 changes: 83 additions & 24 deletions cpp/src/reductions/simple_segmented.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -79,20 +79,24 @@ std::unique_ptr<column> simple_segmented_reduction(column_view const& col,
auto binary_op = simple_op.get_binary_op();
auto identity = simple_op.template get_identity<ResultType>();

auto const result_type =
cudf::is_fixed_point(col.type()) ? col.type() : data_type{type_to_id<ResultType>()};
auto result =
make_fixed_width_column(result_type, num_segments, mask_state::UNALLOCATED, stream, mr);
auto outit = result->mutable_view().template begin<ResultType>();

// TODO: Explore rewriting null_replacing_element_transformer/element_transformer with nullate
auto result = [&] {
if (col.has_nulls()) {
auto f = simple_op.template get_null_replacing_element_transformer<ResultType>();
auto it = thrust::make_transform_iterator(dcol->pair_begin<InputType, true>(), f);
return cudf::reduction::detail::segmented_reduce(
it, offsets.begin(), num_segments, binary_op, identity, stream, mr);
} else {
auto f = simple_op.template get_element_transformer<ResultType>();
auto it = thrust::make_transform_iterator(dcol->begin<InputType>(), f);
return cudf::reduction::detail::segmented_reduce(
it, offsets.begin(), num_segments, binary_op, identity, stream, mr);
}
}();
if (col.has_nulls()) {
auto f = simple_op.template get_null_replacing_element_transformer<ResultType>();
auto it = thrust::make_transform_iterator(dcol->pair_begin<InputType, true>(), f);
cudf::reduction::detail::segmented_reduce(
it, offsets.begin(), offsets.end(), outit, binary_op, identity, stream);
} else {
auto f = simple_op.template get_element_transformer<ResultType>();
auto it = thrust::make_transform_iterator(dcol->begin<InputType>(), f);
cudf::reduction::detail::segmented_reduce(
it, offsets.begin(), offsets.end(), outit, binary_op, identity, stream);
}

// Compute the output null mask
auto const bitmask = col.null_mask();
Expand Down Expand Up @@ -153,14 +157,14 @@ std::unique_ptr<column> string_segmented_reduction(column_view const& col,
auto constexpr identity =
is_argmin ? cudf::detail::ARGMIN_SENTINEL : cudf::detail::ARGMAX_SENTINEL;

auto gather_map =
cudf::reduction::detail::segmented_reduce(it,
offsets.begin(),
num_segments,
string_comparator,
identity,
stream,
rmm::mr::get_current_device_resource());
auto gather_map = make_fixed_width_column(
data_type{type_to_id<size_type>()}, num_segments, mask_state::UNALLOCATED, stream, mr);

auto gather_map_it = gather_map->mutable_view().begin<size_type>();

cudf::reduction::detail::segmented_reduce(
it, offsets.begin(), offsets.end(), gather_map_it, string_comparator, identity, stream);

auto result = std::move(cudf::detail::gather(table_view{{col}},
*gather_map,
cudf::out_of_bounds_policy::NULLIFY,
Expand Down Expand Up @@ -218,6 +222,49 @@ std::unique_ptr<column> string_segmented_reduction(column_view const& col,
CUDF_FAIL("Segmented reduction on string column only supports min and max reduction.");
}

/**
* @brief Fixed point segmented reduction for 'min', 'max'.
*
* @tparam InputType the input column data-type
* @tparam Op the operator of cudf::reduction::op::

* @param col Input column of data to reduce.
* @param offsets Indices to segment boundaries.
* @param null_handling If `null_policy::INCLUDE`, all elements in a segment
* must be valid for the reduced value to be valid. If `null_policy::EXCLUDE`,
* the reduced value is valid if any element in the segment is valid.
* @param stream Used for device memory operations and kernel launches.
* @param mr Device memory resource used to allocate the returned column's device memory
* @return Output column in device memory
*/

template <typename InputType,
typename Op,
CUDF_ENABLE_IF(std::is_same_v<Op, cudf::reduction::op::min> ||
std::is_same_v<Op, cudf::reduction::op::max>)>
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std::unique_ptr<column> fixed_point_segmented_reduction(column_view const& col,
device_span<size_type const> offsets,
null_policy null_handling,
rmm::cuda_stream_view stream,
rmm::mr::device_memory_resource* mr)
{
using RepType = device_storage_type_t<InputType>;
return simple_segmented_reduction<RepType, RepType, Op>(col, offsets, null_handling, stream, mr);
}

template <typename InputType,
typename Op,
CUDF_ENABLE_IF(!std::is_same_v<Op, cudf::reduction::op::min>() &&
!std::is_same_v<Op, cudf::reduction::op::max>())>
std::unique_ptr<column> fixed_point_segmented_reduction(column_view const& col,
device_span<size_type const> offsets,
null_policy null_handling,
rmm::cuda_stream_view stream,
rmm::mr::device_memory_resource* mr)
{
CUDF_FAIL("Segmented reduction on fixed point column only supports min and max reduction.");
}

/**
* @brief Call reduce and return a column of type bool.
*
Expand Down Expand Up @@ -262,15 +309,15 @@ struct same_column_type_dispatcher {
template <typename ElementType>
static constexpr bool is_supported()
{
return !(cudf::is_fixed_point<ElementType>() || cudf::is_dictionary<ElementType>() ||
std::is_same_v<ElementType, cudf::list_view> ||
return !(cudf::is_dictionary<ElementType>() || std::is_same_v<ElementType, cudf::list_view> ||
std::is_same_v<ElementType, cudf::struct_view>);
}

public:
template <typename ElementType,
CUDF_ENABLE_IF(is_supported<ElementType>() &&
!std::is_same_v<ElementType, string_view>)>
!std::is_same_v<ElementType, string_view> &&
!cudf::is_fixed_point<ElementType>())>
std::unique_ptr<column> operator()(column_view const& col,
device_span<size_type const> offsets,
null_policy null_handling,
Expand All @@ -292,6 +339,18 @@ struct same_column_type_dispatcher {
return string_segmented_reduction<ElementType, Op>(col, offsets, null_handling, stream, mr);
}

template <typename ElementType,
CUDF_ENABLE_IF(is_supported<ElementType>() && cudf::is_fixed_point<ElementType>())>
std::unique_ptr<column> operator()(column_view const& col,
device_span<size_type const> offsets,
null_policy null_handling,
rmm::cuda_stream_view stream,
rmm::mr::device_memory_resource* mr)
{
return fixed_point_segmented_reduction<ElementType, Op>(
col, offsets, null_handling, stream, mr);
}

template <typename ElementType, CUDF_ENABLE_IF(!is_supported<ElementType>())>
std::unique_ptr<column> operator()(column_view const&,
device_span<size_type const>,
Expand Down
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