UtilFunction.h File Reference

Implementation of utility functions and classes for machine learning tasks. More...

#include <Eigen/Dense>
#include <cmath>
#include <filesystem>
#include <iostream>
#include "BaseFunction.h"
#include "velox/exec/tests/utils/AssertQueryBuilder.h"
#include "velox/exec/tests/utils/PlanBuilder.h"
#include "velox/exec/tests/utils/TempDirectoryPath.h"
#include "velox/vector/tests/utils/VectorTestBase.h"

Go to the source code of this file.

Classes
class	ChangeRating
	Implements a function to change ratings to binary values. More...
class	ConvertToIntArray
	Implements a function to convert an integer vector to an integer array. More...
class	ConvertToFloatArray
	Implements a function to convert a float vector to a float array. More...
class	ConvertDoubleToFloatArray
	Implements a function to convert a double vector to a float array. More...
class	ConvertDoubleArrayToFloatArray
	Implements a function to convert a double array to a float array. More...

Functions
std::string	LoadBytesFromFile (const std::string &path)
	Loads bytes from a file into a string.
bool	stringToBool (const std::string &str)
	Converts a string to a boolean value.
std::string	getEnvVar (std::string const &key)
	Retrieves the value of an environment variable.
void	readDataStats (const std::string &path, int &numRows, int &numCols)
	Reads the number of rows and columns from a data statistics file.
template<typename T>
T *	flattenVectorToPointer (const std::vector< std::vector< T > > &vec2D, size_t &totalSize)
	Flattens a 2D vector into a 1D array.
template<typename T>
T *	flattenVectorToPointer (const std::vector< std::vector< T > > &vec2D)
	Flattens a 2D vector into a 1D array (overloaded version without totalSize).
int	countWords (const std::string &input)
	Counts the number of words in a string.

Detailed Description

Implementation of utility functions and classes for machine learning tasks.

Copyright

Copyright (c) 2025 ASU Cactus Lab. 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.

Function Documentation

countWords()

int countWords

(

const std::string &

input

)

Counts the number of words in a string.

Parameters

input

The input string.

Returns

The number of words in the string.

flattenVectorToPointer() [1/2]

template<typename T>

T * flattenVectorToPointer

(

const std::vector< std::vector< T > > &

vec2D

)

Flattens a 2D vector into a 1D array (overloaded version without totalSize).

Template Parameters

T	The type of elements in the vector.

Parameters

vec2D

The 2D vector to flatten.

Returns

A pointer to the flattened array.

flattenVectorToPointer() [2/2]

template<typename T>

T * flattenVectorToPointer	(	const std::vector< std::vector< T > > &	vec2D,
		size_t &	totalSize )

Flattens a 2D vector into a 1D array.

Template Parameters

T	The type of elements in the vector.

Parameters

vec2D	The 2D vector to flatten.
totalSize	Reference to store the total size of the flattened array.

Returns

A pointer to the flattened array.

getEnvVar()

std::string getEnvVar

(

std::string const &

key

)

Retrieves the value of an environment variable.

Parameters

key	The name of the environment variable.

Returns

The value of the environment variable, or an empty string if not found.

LoadBytesFromFile()

std::string LoadBytesFromFile

(

const std::string &

path

)

Loads bytes from a file into a string.

Parameters

path	Path to the file.

Returns

A string containing the file's contents.

readDataStats()

void readDataStats	(	const std::string &	path,
		int &	numRows,
		int &	numCols )

Reads the number of rows and columns from a data statistics file.

Parameters

path	Path to the data statistics file.
numRows	Reference to store the number of rows.
numCols	Reference to store the number of columns.

stringToBool()

bool stringToBool

(

const std::string &

str

)

Converts a string to a boolean value.

Parameters

str	The string to convert.

Returns

The boolean value corresponding to the string.