epic.trees.SubsampledTreebank.scala Maven / Gradle / Ivy

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package epic.trees
/*
 Copyright 2012 David Hall

 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.
*/
import java.io.File

/**
 * A Treebank that uses a few number of training and test sentences.
 *
 * @author dlwh
 */
class SubsampledTreebank(base: Treebank[String], numTrain: Int, numDev:Int, numTest: Int) extends Treebank[String] {
  def sections = IndexedSeq("train","test","dev")

  val test = new Portion("test",IndexedSeq("test"))
  val dev = new Portion("dev",IndexedSeq("dev"))
  val train = new Portion("train",IndexedSeq("train"))

  def treesFromSection(sec: String) = sec match {
    case "train" => downSample(base.train.trees,numTrain)
    case "test" => downSample(base.test.trees,numTest)
    case "dev" => downSample(base.dev.trees,numDev)
    case _ => sys.error("unknown section: " + sec)
  }

  private def downSample[K](trees: Iterator[K], num: Int) = {
    if(num < 0) trees
    else {
      // TODO: maybe randomly sample
      trees.take(num)
    }
  }
}