Functions (GridGain 8.9.15)

java.lang.Object
- org.apache.ignite.ml.math.functions.Functions

public final class Functions
extends Object

Compatibility with Apache Mahout.

Field Summary

Fields
Modifier and Type	Field and Description
`static IgniteDoubleFunction<Double>`	`ABS` Function that returns `Math.abs(a)`.
`static IgniteBiFunction<Double,Double,Double>`	`COMPARE` Function that returns {@code a < b ?
`static IgniteDoubleFunction<Double>`	`IDENTITY` Function that returns its argument.
`static IgniteDoubleFunction<Double>`	`INV` Function that returns `1 / a`
`static IgniteBiFunction<Double,Double,Double>`	`LG` Function that returns `Math.log(a) / Math.log(b)`.
`static IgniteDoubleFunction<Double>`	`LOG2` Function that returns `Math.log(a) / Math.log(2)`.
`static IgniteBiFunction<Double,Double,Double>`	`MAX_ABS` Function that returns `max(abs(a), abs(b))`.
`static IgniteBiFunction<Double,Double,Double>`	`MIN` Function that returns `min(a, b)`.
`static IgniteBiFunction<Double,Double,Double>`	`MIN_ABS` Function that returns `min(abs(a), abs(b))`.
`static IgniteBiFunction<Double,Double,Double>`	`MINUS` Function that returns `a - b`.
`static IgniteBiFunction<Double,Double,Double>`	`MINUS_ABS` Function that returns `abs(a - b)`.
`static IgniteBiFunction<Double,Double,Double>`	`MINUS_SQUARED` Function that returns `(a - b) * (a - b)`
`static IgniteBiFunction<Double,Double,Double>`	`MOD` Function that returns `a % b`.
`static IgniteBiFunction<Double,Double,Double>`	`MULT` Function that returns `a * b`.
`static IgniteDoubleFunction<Double>`	`NEGATE` Function that returns `-a`.
`static IgniteBiFunction<Double,Double,Double>`	`PLUS` Function that returns `a + b`.
`static IgniteBiFunction<Double,Double,Double>`	`PLUS_ABS` Function that returns `Math.abs(a) + Math.abs(b)`.
`static IgniteDoubleFunction<Double>`	`SIGMOID` Function that returns `1 / (1 + exp(-a)`
`static IgniteDoubleFunction<Double>`	`SIGMOIDGRADIENT` Function that returns `a * (1-a)`
`static IgniteDoubleFunction<Double>`	`SIGN` Function that returns {@code a < 0 ?
`static IgniteDoubleFunction<Double>`	`SQUARE` Function that returns `a * a`.

Constructor Summary

Constructors
Constructor and Description

Functions()

Constructors
Constructor and Description
`Functions()`

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static <A,B extends Comparable<B>> IgniteBiTuple<Integer,A>`	`argmin(List<A> args, IgniteFunction<A,B> f)`
`static IgniteDoubleFunction<Double>`	`constant(Double c)` Function that returns passed constant.
`static <A,B,C> IgniteCurriedBiFunction<A,B,C>`	`curry(BiFunction<A,B,C> f)` Curry bi-function.
`static <A,B,C> IgniteCurriedBiFunction<A,B,C>`	`curry(IgniteBiFunction<A,B,C> f)` Transform bi-function of the form (a, b) -> c into a function of form a -> (b -> c).
`static <A,B,C,D> IgniteCurriedTriFunction<A,B,C,D>`	`curry(IgniteTriFunction<A,B,C,D> f)` Transform tri-function of the form (a, b, c) -> d into a function of form a -> (b -> (c -> d)).
`static IgniteDoubleFunction<Double>`	`div(double b)` Function that returns `a / b`.
`static <T> T`	`MAX_GENERIC(T a, T b, Comparator<T> f)` Generic 'max' function.
`static <T> T`	`MIN_GENERIC(T a, T b, Comparator<T> f)` Generic 'min' function.
`static IgniteBiFunction<Double,Double,Double>`	`minusMult(double constant)` Function that returns `a - b*constant`.
`static IgniteDoubleFunction<Double>`	`mult(double b)` Function that returns `a * b`.
`static <A,B,C> IgniteBiFunction<A,B,IgniteSupplier<C>>`	`outputSupplier(IgniteBiFunction<A,B,C> f)` Transform function of form (a, b) -> c into (a, b) - () -> c.
`static <A,B> IgniteFunction<A,IgniteSupplier<B>>`	`outputSupplier(IgniteFunction<A,B> f)` Transform function of form a -> b into a -> (() -> b).
`static IgniteDoubleFunction<Double>`	`plus(double b)` Function that returns `a + b`.
`static IgniteBiFunction<Double,Double,Double>`	`plusMult(double constant)` Function that returns `a + b*constant`.
`static IgniteDoubleFunction<Double>`	`pow(double b)` Function that returns `Math.pow(a, b)`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - ABS
```
public static final IgniteDoubleFunction<Double> ABS
```
    Function that returns Math.abs(a).
  - IDENTITY
```
public static final IgniteDoubleFunction<Double> IDENTITY
```
    Function that returns its argument.
  - LOG2
```
public static final IgniteDoubleFunction<Double> LOG2
```
    Function that returns Math.log(a) / Math.log(2).
  - NEGATE
```
public static final IgniteDoubleFunction<Double> NEGATE
```
    Function that returns -a.
  - SIGN
```
public static final IgniteDoubleFunction<Double> SIGN
```
    Function that returns a < 0 ? -1 : a > 0 ? 1 : 0 .
  - SQUARE
```
public static final IgniteDoubleFunction<Double> SQUARE
```
    Function that returns a * a.
  - SIGMOID
```
public static final IgniteDoubleFunction<Double> SIGMOID
```
    Function that returns 1 / (1 + exp(-a)
  - INV
```
public static final IgniteDoubleFunction<Double> INV
```
    Function that returns 1 / a
  - SIGMOIDGRADIENT
```
public static final IgniteDoubleFunction<Double> SIGMOIDGRADIENT
```
    Function that returns a * (1-a)
  - MOD
```
public static final IgniteBiFunction<Double,Double,Double> MOD
```
    Function that returns a % b.
  - MULT
```
public static final IgniteBiFunction<Double,Double,Double> MULT
```
    Function that returns a * b.
  - LG
```
public static final IgniteBiFunction<Double,Double,Double> LG
```
    Function that returns Math.log(a) / Math.log(b).
  - PLUS
```
public static final IgniteBiFunction<Double,Double,Double> PLUS
```
    Function that returns a + b.
  - MINUS
```
public static final IgniteBiFunction<Double,Double,Double> MINUS
```
    Function that returns a - b.
  - MIN
```
public static final IgniteBiFunction<Double,Double,Double> MIN
```
    Function that returns min(a, b).
  - MINUS_ABS
```
public static final IgniteBiFunction<Double,Double,Double> MINUS_ABS
```
    Function that returns abs(a - b).
  - MAX_ABS
```
public static final IgniteBiFunction<Double,Double,Double> MAX_ABS
```
    Function that returns max(abs(a), abs(b)).
  - MIN_ABS
```
public static final IgniteBiFunction<Double,Double,Double> MIN_ABS
```
    Function that returns min(abs(a), abs(b)).
  - PLUS_ABS
```
public static final IgniteBiFunction<Double,Double,Double> PLUS_ABS
```
    Function that returns Math.abs(a) + Math.abs(b).
  - MINUS_SQUARED
```
public static final IgniteBiFunction<Double,Double,Double> MINUS_SQUARED
```
    Function that returns (a - b) * (a - b)
  - COMPARE
```
public static final IgniteBiFunction<Double,Double,Double> COMPARE
```
    Function that returns a < b ? -1 : a > b ? 1 : 0.
- Constructor Detail
  - Functions
```
public Functions()
```
- Method Detail
  - MAX_GENERIC
```
public static <T> T MAX_GENERIC(T a,
                                T b,
                                Comparator<T> f)
```
    Generic 'max' function.
    
    Type Parameters:
    
    T - Type of objects to compare.
    
    Parameters:
    
    a - First object to compare.
    
    b - Second object to compare.
    
    f - Comparator.
    
    Returns:
    
    Maximum between a and b in terms of comparator f.
  - MIN_GENERIC
```
public static <T> T MIN_GENERIC(T a,
                                T b,
                                Comparator<T> f)
```
    Generic 'min' function.
    
    Type Parameters:
    
    T - Type of objects to compare.
    
    Parameters:
    
    a - First object to compare.
    
    b - Second object to compare.
    
    f - Comparator.
    
    Returns:
    
    Minimum between a and b in terms of comparator f.
  - argmin
```
public static <A,B extends Comparable<B>> IgniteBiTuple<Integer,A> argmin(List<A> args,
                                                                          IgniteFunction<A,B> f)
```
  - plus
```
public static IgniteDoubleFunction<Double> plus(double b)
```
    Function that returns a + b. a is a variable, b is fixed.
    
    Parameters:
    
    b - Value to add.
    
    Returns:
    
    Function for this operation.
  - mult
```
public static IgniteDoubleFunction<Double> mult(double b)
```
    Function that returns a * b. a is a variable, b is fixed.
    
    Parameters:
    
    b - Value to multiply to.
    
    Returns:
    
    Function for this operation.
  - div
```
public static IgniteDoubleFunction<Double> div(double b)
```
    Function that returns a / b. a is a variable, b is fixed.
    
    Parameters:
    
    b - Value to divide to.
    
    Returns:
    
    Function for this operation.
  - plusMult
```
public static IgniteBiFunction<Double,Double,Double> plusMult(double constant)
```
    Function that returns a + b*constant. a and b are variables, constant is fixed.
    
    Parameters:
    
    constant - Value to use in multiply.
    
    Returns:
    
    Function for this operation.
  - minusMult
```
public static IgniteBiFunction<Double,Double,Double> minusMult(double constant)
```
    Function that returns a - b*constant. a and b are variables, constant is fixed.
    
    Parameters:
    
    constant - Value to use in multiply.
    
    Returns:
    
    Function for this operation.
  - constant
```
public static IgniteDoubleFunction<Double> constant(Double c)
```
    Function that returns passed constant.
  - pow
```
public static IgniteDoubleFunction<Double> pow(double b)
```
    Function that returns Math.pow(a, b).
    
    Parameters:
    
    b - Power value.
    
    Returns:
    
    Function for given power.
  - curry
```
public static <A,B,C> IgniteCurriedBiFunction<A,B,C> curry(BiFunction<A,B,C> f)
```
    Curry bi-function.
    
    Type Parameters:
    
    A - Type of first argument of f.
    
    B - Type of second argument of f.
    
    C - Return type of f.
    
    Parameters:
    
    f - Bi-function to curry.
    
    Returns:
    
    Curried bi-function.
  - curry
```
public static <A,B,C> IgniteCurriedBiFunction<A,B,C> curry(IgniteBiFunction<A,B,C> f)
```
    Transform bi-function of the form (a, b) -> c into a function of form a -> (b -> c).
    
    Type Parameters:
    
    A - Type of first argument of function to be transformed.
    
    B - Type of second argument of function to be transformed.
    
    C - Type of third argument of function to be transformed.
    
    Parameters:
    
    f - Function to be curried.
    
    Returns:
    
    Curried bi-function.
  - curry
```
public static <A,B,C,D> IgniteCurriedTriFunction<A,B,C,D> curry(IgniteTriFunction<A,B,C,D> f)
```
    Transform tri-function of the form (a, b, c) -> d into a function of form a -> (b -> (c -> d)).
    
    Type Parameters:
    
    A - Type of first argument of function to be transformed.
    
    B - Type of second argument of function to be transformed.
    
    C - Type of third argument of function to be transformed.
    
    D - Type output of function to be transformed.
    
    Parameters:
    
    f - Function to be curried.
    
    Returns:
    
    Curried tri-function.
  - outputSupplier
```
public static <A,B> IgniteFunction<A,IgniteSupplier<B>> outputSupplier(IgniteFunction<A,B> f)
```
    Transform function of form a -> b into a -> (() -> b).
    
    Type Parameters:
    
    A - Type of input of function to be transformed.
    
    B - Type of output of function to be transformed.
    
    Parameters:
    
    f - Function to be transformed.
    
    Returns:
    
    Transformed function.
  - outputSupplier
```
public static <A,B,C> IgniteBiFunction<A,B,IgniteSupplier<C>> outputSupplier(IgniteBiFunction<A,B,C> f)
```
    Transform function of form (a, b) -> c into (a, b) - () -> c.
    
    Type Parameters:
    
    A - Type of first argument of function to be transformed.
    
    B - Type of second argument of function to be transformed.
    
    C - Type of output of function to be transformed.
    
    Parameters:
    
    f - Function to be transformed.
    
    Returns:
    
    Transformed function.

Class Functions

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ABS

IDENTITY

LOG2

NEGATE

SIGN

SQUARE

SIGMOID

INV

SIGMOIDGRADIENT

MOD

MULT

LG

PLUS

MINUS

MIN

MINUS_ABS

MAX_ABS

MIN_ABS

PLUS_ABS

MINUS_SQUARED

COMPARE

Constructor Detail

Functions

Method Detail

MAX_GENERIC

MIN_GENERIC

argmin

plus

mult

div

plusMult

minusMult

constant

pow

curry

curry

curry

outputSupplier

outputSupplier