DictionaryType.java

/*
 * Copyright © 2014 - 2021 Leipzig University (Database Research Group)
 *
 * 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
 *
 *     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 org.gradoop.flink.algorithms.fsm.dimspan.config;

/**
 * Dictionary coding options.
 */
public enum DictionaryType implements Comparable<DictionaryType> {
  /**
   * No label pruning and alphabetical order.
   */
  RANDOM,
  /**
   * {@code Higher label frequency <=> lower label} (original gSpan)
   */
  INVERSE_PROPORTIONAL,
  /**
   * {@code Higher label frequency <=> higher label}
   */
  PROPORTIONAL,
  /**
   * label pruning but no alphabetical order.
   */
  FREQUENT
}