com.tencent.angel.sona.tree.basic.split.SplitPoint Maven / Gradle / Ivy

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/*
 * Tencent is pleased to support the open source community by making Angel available.
 *
 * Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
 *
 * 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
 *
 * https://opensource.org/licenses/Apache-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.
 *
 */
package com.tencent.angel.sona.tree.basic.split;

public class SplitPoint extends SplitEntry {
    private float fvalue;

    public SplitPoint() {
        this(-1, 0.0f, 0.0f);
    }

    public SplitPoint(int fid, float fvalue, float gain) {
        super(fid, gain);
        this.fvalue = fvalue;
    }

    @Override
    public int flowTo(float x) {
        return x < fvalue ? 0 : 1;
    }

    @Override
    public int defaultTo() {
        return fvalue > 0.0f ? 0 : 1;
    }

    @Override
    public SplitType splitType() {
        return SplitType.SPLIT_POINT;
    }

    public float getFvalue() {
        return fvalue;
    }

    public void setFvalue(float fvalue) {
        this.fvalue = fvalue;
    }

    @Override
    public String toString() {
        return String.format("%s fid[%d] fvalue[%f] gain[%f]",
                this.splitType(), fid, fvalue, gain);
    }
}