/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
 *
 *   http://www.apache.org/licenses/LICENSE-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 hivemall.model;

import hivemall.utils.lang.Copyable;

import javax.annotation.Nonnegative;

public interface IWeightValue extends Copyable<IWeightValue> {

    public enum WeightValueType {
        NoParams, ParamsF1, ParamsF2, ParamsCovar;
    }

    WeightValueType getType();

    float getFloatParams(@Nonnegative int i);

    float get();

    void set(float weight);

    boolean hasCovariance();

    float getCovariance();

    void setCovariance(float cov);

    float getSumOfSquaredGradients();

    float getSumOfSquaredDeltaX();

    float getSumOfGradients();

    /**
     * @return whether touched in training or not
     */
    boolean isTouched();

    void setTouched(boolean touched);

    short getClock();

    void setClock(short clock);

    byte getDeltaUpdates();

    void setDeltaUpdates(byte deltaUpdates);

}