org.apache.ignite.ml.util

Class Utils

java.lang.Object

org.apache.ignite.ml.util.Utils

public class Utils
extends Object

Class with various utility methods.

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static <T> T	copy(T orig) Perform deep copy of an object.
static int[]	selectKDistinct(int n, int k) Select k distinct integers from range [0, n) with reservoir sampling: https://en.wikipedia.org/wiki/Reservoir_sampling.
static int[]	selectKDistinct(int n, int k, Random rand) Select k distinct integers from range [0, n) with reservoir sampling: https://en.wikipedia.org/wiki/Reservoir_sampling.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Utils

public Utils()

Method Detail

copy

public static <T> T copy(T orig)

Perform deep copy of an object.

Type Parameters:

T - Class of original object;

Parameters:

orig - Original object.

Returns:

Deep copy of original object.

selectKDistinct

public static int[] selectKDistinct(int n,
                                    int k,
                                    Random rand)

Select k distinct integers from range [0, n) with reservoir sampling: https://en.wikipedia.org/wiki/Reservoir_sampling.

Parameters:

n - Number specifying left end of range of integers to pick values from.

k - Count specifying how many integers should be picked.

rand - RNG.

Returns:

Array containing k distinct integers from range [0, n);

selectKDistinct

public static int[] selectKDistinct(int n,
                                    int k)

Select k distinct integers from range [0, n) with reservoir sampling: https://en.wikipedia.org/wiki/Reservoir_sampling. Equivalent to selectKDistinct(n, k, new Random()).

Parameters:

n - Number specifying left end of range of integers to pick values from.

k - Count specifying how many integers should be picked.

Returns:

Array containing k distinct integers from range [0, n);