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Rework cudf::find_and_replace_all to use gather-based make_strings_co…
…lumn (rapidsai#15305) Reworks `cudf::find_and_replace_all` for strings to work with long strings and enable it to support large strings. The custom kernels were replaced with a gather-based `make_strings_column` already optimized for long and short strings. Large strings will automatically be supported in `make_strings_column` in a future PR. Authors: - David Wendt (https://github.com/davidwendt) Approvers: - Muhammad Haseeb (https://github.com/mhaseeb123) - Paul Mattione (https://github.com/pmattione-nvidia) - Kyle Edwards (https://github.com/KyleFromNVIDIA) - Bradley Dice (https://github.com/bdice) URL: rapidsai#15305
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| /* | ||
| * Copyright (c) 2024, NVIDIA CORPORATION. | ||
| * | ||
| * 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 <cudf/column/column_device_view.cuh> | ||
| #include <cudf/detail/replace.hpp> | ||
| #include <cudf/strings/detail/strings_column_factories.cuh> | ||
| #include <cudf/utilities/default_stream.hpp> | ||
| #include <cudf/utilities/error.hpp> | ||
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| #include <rmm/cuda_stream_view.hpp> | ||
| #include <rmm/device_scalar.hpp> | ||
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| #include <thrust/execution_policy.h> | ||
| #include <thrust/transform.h> | ||
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| namespace cudf { | ||
| namespace strings { | ||
| namespace detail { | ||
| namespace { | ||
| struct find_replace_fn { | ||
| column_device_view d_input; | ||
| column_device_view d_values; | ||
| column_device_view d_replacements; | ||
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| __device__ string_index_pair get_replacement(size_type idx) | ||
| { | ||
| if (d_replacements.is_null(idx)) { return string_index_pair{nullptr, 0}; } | ||
| auto const d_str = d_replacements.element<string_view>(idx); | ||
| return string_index_pair{d_str.data(), d_str.size_bytes()}; | ||
| } | ||
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| __device__ string_index_pair operator()(size_type idx) | ||
| { | ||
| if (d_input.is_null(idx)) { return string_index_pair{nullptr, 0}; } | ||
| auto const d_str = d_input.element<string_view>(idx); | ||
| // find d_str in d_values | ||
| // if found return corresponding replacement | ||
| // if not found, return d_str | ||
| auto const begin = thrust::counting_iterator<size_type>(0); | ||
| auto const end = thrust::counting_iterator<size_type>(d_values.size()); | ||
| auto const itr = | ||
| thrust::find_if(thrust::seq, begin, end, [d_values = d_values, d_str](size_type i) -> bool { | ||
| return d_str == d_values.element<string_view>(i); | ||
| }); | ||
| return itr == end ? string_index_pair{d_str.data(), d_str.size_bytes()} : get_replacement(*itr); | ||
| } | ||
| }; | ||
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| } // namespace | ||
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| std::unique_ptr<cudf::column> find_and_replace_all( | ||
| cudf::strings_column_view const& input, | ||
| cudf::strings_column_view const& values_to_replace, | ||
| cudf::strings_column_view const& replacement_values, | ||
| rmm::cuda_stream_view stream, | ||
| rmm::mr::device_memory_resource* mr) | ||
| { | ||
| auto d_input = cudf::column_device_view::create(input.parent(), stream); | ||
| auto d_values_to_replace = cudf::column_device_view::create(values_to_replace.parent(), stream); | ||
| auto d_replacements = cudf::column_device_view::create(replacement_values.parent(), stream); | ||
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| auto indices = rmm::device_uvector<string_index_pair>(input.size(), stream); | ||
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| thrust::transform(rmm::exec_policy_nosync(stream), | ||
| thrust::counting_iterator<size_type>(0), | ||
| thrust::counting_iterator<size_type>(input.size()), | ||
| indices.begin(), | ||
| find_replace_fn{*d_input, *d_values_to_replace, *d_replacements}); | ||
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| return make_strings_column(indices.begin(), indices.end(), stream, mr); | ||
| } | ||
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| } // namespace detail | ||
| } // namespace strings | ||
| } // namespace cudf |
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