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package ml;
import java.util.Arrays;
import java.util.Random;
import shared.Tools;
public abstract class Function {
/*--------------------------------------------------------------*/
/*---------------- Methods ----------------*/
/*--------------------------------------------------------------*/
public abstract double activate(double x);
public abstract double derivativeX(double x);
public abstract double derivativeFX(double fx);
public abstract double derivativeXFX(double x, double fx);
public abstract int type();
public abstract String name();
/*--------------------------------------------------------------*/
/*---------------- Static Methods ----------------*/
/*--------------------------------------------------------------*/
static final int toType(String b) {
return toType(b, true);
}
static final int toType(String b, boolean assertValid) {
int type;
if(Tools.startsWithLetter(b)) {
type=Tools.findIC(b, TYPES);
if(type<0) {type=Tools.findIC(b, TYPES_LONG);}
}else{
type=Integer.parseInt(b);
throw new RuntimeException("Numbers are not allowed for defining types: "+b);
}
assert(!assertValid || type>=0 && type<TYPES.length) : type;
// System.err.println(b+" -> "+type);
return type;
}
public static synchronized final void normalizeTypeRates() {
assert(TYPE_RATES_CUM==null);
double sum=shared.Vector.sum(TYPE_RATES);
assert(sum>=0) : sum;
if(sum<=0) {
TYPE_RATES_CUM=null;
return;
}
if(Tools.absdif(sum, 1)>0.000001){
final double mult=1.0/sum;
for(int i=0; i<TYPE_RATES.length; i++) {
double r=TYPE_RATES[i];
assert(r>=0) : i+": "+r;
TYPE_RATES[i]=(float)(r*mult);
}
}
TYPE_RATES_CUM=new float[TYPE_RATES.length];
double c=0;
for(int i=0; i<TYPE_RATES.length; i++) {
double r=TYPE_RATES[i];
assert(r>=0) : i+": "+r;
c+=r;
TYPE_RATES_CUM[i]=(float)c;
}
assert(Tools.absdif(c, 1)<0.00001);
TYPE_RATES_CUM[TYPE_RATES_CUM.length-1]=1;
}
/*--------------------------------------------------------------*/
public static final Function getFunction(int type) {
return functions[type];
}
private static final Function[] makeFunctions() {
assert(functions==null);
Function[] array=new Function[TYPES.length];
array[SIG]=Sigmoid.instance;
array[TANH]=Tanh.instance;
array[RSLOG]=RSLog.instance;
array[MSIG]=MSig.instance;
array[SWISH]=Swish.instance;
array[ESIG]=ExtendedSigmoid.instance;
array[EMSIG]=ExtendedMSig.instance;
array[BELL]=Bell.instance;
for(int i=0; i<array.length; i++) {
Function f=array[i];
assert(f!=null) : i+", "+TYPES[i]+", "+f;
assert(f.type()==i) : i+", "+TYPES[i]+", "+f;
assert(f.name().equals(TYPES[i])) : i+", "+f;
}
return array;
}
/*--------------------------------------------------------------*/
static final Function randomFunction(Random randy) {
final int type=randomType(randy, TYPE_RATES_CUM);
return functions[type];
}
static final int randomType(Random randy, float[] cumRate) {
float f=randy.nextFloat();
for(int i=0; i<cumRate.length; i++) {
if(cumRate[i]>=f) {return i;}
}
assert(false) : f+", "+Arrays.toString(cumRate);
return cumRate.length-1;
}
/*--------------------------------------------------------------*/
/*---------------- Fields ----------------*/
/*--------------------------------------------------------------*/
public static final int SIG=0, TANH=1, RSLOG=2, MSIG=3, SWISH=4, ESIG=5, EMSIG=6, BELL=7;
static final String[] TYPES=new String[] {"SIG", "TANH", "RSLOG", "MSIG", "SWISH", "ESIG", "EMSIG", "BELL"};
static final String[] TYPES_LONG=new String[] {"SIGMOID", "HYPERBOLICTANGENT",
"ROTATIONALLYSYMMETRICLOGARITHM", "MIRROREDSIGMOID", "SWISH",
"EXTENDEDSIGMOID", "EXTENDEDMIRROREDSIGMOID", "GAUSSIAN"};
private static final Function[] functions=makeFunctions();
public static final float[] TYPE_RATES=new float[TYPES.length];
//tanh=.4 sig=.6 msig=.02 rslog=.02 swish=0
public static float[] TYPE_RATES_CUM=null;
static {
TYPE_RATES[TANH]=0.4f;
TYPE_RATES[SIG]=0.6f;
TYPE_RATES[MSIG]=0.02f;
TYPE_RATES[RSLOG]=0.02f;
}
}
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