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deserializers.cpp
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deserializers.cpp
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/*
* SPDX-FileCopyrightText: Copyright (c) 2022-2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* 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 "morpheus/io/deserializers.hpp"
#include "morpheus/utilities/cudf_util.hpp" // for CudfHelper
#include "morpheus/utilities/stage_util.hpp"
#include "morpheus/utilities/string_util.hpp"
#include <cudf/column/column.hpp>
#include <cudf/io/csv.hpp>
#include <cudf/io/json.hpp>
#include <cudf/io/parquet.hpp>
#include <cudf/table/table.hpp> // IWYU pragma: keep
#include <cudf/types.hpp> // for cudf::type_id
#include <pybind11/pybind11.h> // IWYU pragma: keep
#include <algorithm>
#include <iterator>
#include <memory>
#include <regex>
#include <sstream>
#include <stdexcept>
#include <utility>
// We're already including pybind11.h, and including only gil.h as IWYU suggests yields an undefined symbol error
// IWYU pragma: no_include <pybind11/gil.h>
namespace {
const std::regex IndexRegex(R"(^\s*(unnamed: 0|id)\s*$)",
std::regex_constants::ECMAScript | std::regex_constants::icase);
const std::regex UnnamedRegex(R"(^\s*unnamed: 0\s*$)", std::regex_constants::ECMAScript | std::regex_constants::icase);
} // namespace
namespace morpheus {
std::vector<std::string> get_column_names_from_table(const cudf::io::table_with_metadata& table)
{
return foreach_map(table.metadata.schema_info, [](auto schema) { return schema.name; });
}
cudf::io::table_with_metadata load_table_from_file(const std::string& filename, FileTypes file_type)
{
if (file_type == FileTypes::Auto)
{
file_type = determine_file_type(filename); // throws if it is unable to determine the type
}
cudf::io::table_with_metadata table;
switch (file_type)
{
case FileTypes::JSON: {
auto options = cudf::io::json_reader_options::builder(cudf::io::source_info{filename}).lines(true);
table = cudf::io::read_json(options.build());
break;
}
case FileTypes::CSV: {
auto options = cudf::io::csv_reader_options::builder(cudf::io::source_info{filename});
table = cudf::io::read_csv(options.build());
break;
}
case FileTypes::PARQUET: {
auto options = cudf::io::parquet_reader_options::builder(cudf::io::source_info{filename});
table = cudf::io::read_parquet(options.build());
break;
}
case FileTypes::Auto:
default:
throw std::logic_error(MORPHEUS_CONCAT_STR("Unsupported filetype: " << file_type));
}
if (!table.tbl)
{
throw std::runtime_error(MORPHEUS_CONCAT_STR("Failed to load file '" << filename << "' as type " << file_type));
}
return table;
}
pybind11::object read_file_to_df(const std::string& filename, FileTypes file_type)
{
auto table = load_table_from_file(filename, file_type);
int index_col_count = prepare_df_index(table);
pybind11::gil_scoped_acquire gil;
return CudfHelper::table_from_table_with_metadata(std::move(table), index_col_count);
}
int get_index_col_count(const cudf::io::table_with_metadata& data_table)
{
int index_col_count = 0;
auto const& schema = data_table.metadata.schema_info;
std::vector<std::string> names;
names.reserve(schema.size());
std::transform(schema.cbegin(), schema.cend(), std::back_inserter(names), [](auto const& c) { return c.name; });
// Check if we have a first column with INT64 data type
if (names.size() >= 1 && data_table.tbl->get_column(0).type().id() == cudf::type_id::INT64)
{
// Get the column name
const auto& col_name = names[0];
// Check it against some common terms
if (std::regex_search(col_name, IndexRegex))
{
index_col_count = 1;
}
}
return index_col_count;
}
int prepare_df_index(cudf::io::table_with_metadata& data_table)
{
const int index_col_count = get_index_col_count(data_table);
if (index_col_count > 0)
{
auto& col_name = data_table.metadata.schema_info[0].name;
// Also, if its the hideous 'Unnamed: 0', then just use an empty string
if (std::regex_search(col_name, UnnamedRegex))
{
col_name.clear();
}
}
return index_col_count;
}
} // namespace morpheus