com.davidbracewell.ml.sequence.indexers.SinglePassIndexer.java Source code

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Here is the source code for com.davidbracewell.ml.sequence.indexers.SinglePassIndexer.java

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/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.ml.sequence.indexers;

import com.davidbracewell.ml.Instance;
import com.davidbracewell.ml.sequence.Sequence;
import com.google.common.collect.Lists;

import java.util.List;

/**
 * @author David B. Bracewell
 */
public class SinglePassIndexer<V> implements DataIndexer<V> {

    @Override
    public List<List<Instance>> index(List<Sequence<V>> data) {
        List<List<Instance>> instances = Lists.newLinkedList();
        for (Sequence<V> sequence : data) {
            List<Instance> list = Lists.newArrayListWithExpectedSize(sequence.length());
            for (int i = 0; i < sequence.length(); i++) {
                Instance instance = sequence.generateInstance(i, sequence.getLabels());
                instance.trimToSize();
                list.add(instance);
            }
            instances.add(list);
        }
        return instances;
    }

}//END OF SinglePassIndexer