org.elasticsearch.xpack.core.ml.inference.trainedmodel.PredictionFieldType Maven / Gradle / Ivy
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0; you may not use this file except in compliance with the Elastic License
* 2.0.
*/
package org.elasticsearch.xpack.core.ml.inference.trainedmodel;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import java.io.IOException;
import java.util.Locale;
/**
* The type of the prediction field.
* This modifies how the predicted class values are written for classification models
*/
public enum PredictionFieldType implements Writeable {
STRING,
NUMBER,
BOOLEAN;
private static final double EPS = 1.0E-9;
public static PredictionFieldType fromString(String name) {
return valueOf(name.trim().toUpperCase(Locale.ROOT));
}
public static PredictionFieldType fromStream(StreamInput in) throws IOException {
return in.readEnum(PredictionFieldType.class);
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeEnum(this);
}
@Override
public String toString() {
return name().toLowerCase(Locale.ROOT);
}
public Object transformPredictedValue(Double value, String stringRep) {
if (value == null) {
return null;
}
switch(this) {
case STRING:
return stringRep == null ? value.toString() : stringRep;
case BOOLEAN:
if (isNumberQuickCheck(stringRep)) {
try {
// 1 is true, 0 is false
return Integer.parseInt(stringRep) == 1;
} catch (NumberFormatException nfe) {
// do nothing, allow fall through to final fromDouble
}
} else if (isBoolQuickCheck(stringRep)) { // if we start with t/f case insensitive, it indicates boolean string
return Boolean.parseBoolean(stringRep);
}
return fromDouble(value);
case NUMBER:
// Quick check to verify that the string rep is LIKELY a number
// Still handles the case where it throws and then returns the underlying value
if (isNumberQuickCheck(stringRep)) {
try {
return Long.parseLong(stringRep);
} catch (NumberFormatException nfe) {
// do nothing, allow fall through to final return
}
}
return value;
default:
return value;
}
}
private static boolean fromDouble(double value) {
if ((areClose(value, 1.0D) || areClose(value, 0.0D)) == false) {
throw new IllegalArgumentException(
"Cannot transform numbers other than 0.0 or 1.0 to boolean. Provided number [" + value + "]");
}
return areClose(value, 1.0D);
}
private static boolean areClose(double value1, double value2) {
return Math.abs(value1 - value2) < EPS;
}
private static boolean isNumberQuickCheck(String stringRep) {
return Strings.isNullOrEmpty(stringRep) == false && (stringRep.charAt(0) == '-' || Character.isDigit(stringRep.charAt(0)));
}
private static boolean isBoolQuickCheck(String stringRep) {
if (Strings.isNullOrEmpty(stringRep)) {
return false;
}
char c = stringRep.charAt(0);
return 't' == c || 'T' == c || 'f' == c || 'F' == c;
}
}