org.apache.mahout.flinkbindings.blas.FlinkOpRowRange.scala Maven / Gradle / Ivy

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/**
 * 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 org.apache.mahout.flinkbindings.blas

import org.apache.flink.api.scala._
import org.apache.mahout.flinkbindings.drm.FlinkDrm
import org.apache.mahout.flinkbindings.drm.RowsFlinkDrm
import org.apache.mahout.math.drm.logical.OpRowRange

/**
 * Implementation of Flink OpRowRange
 */
object FlinkOpRowRange {

  def slice(op: OpRowRange, A: FlinkDrm[Int]): FlinkDrm[Int] = {
    val rowRange = op.rowRange
    val firstIdx = rowRange.head

    val filtered = A.asRowWise.ds.filter {
      tuple => rowRange.contains(tuple._1)
    }

    val res = filtered.map {
      tuple => (tuple._1 - firstIdx, tuple._2)
    }

    new RowsFlinkDrm(res, op.ncol)
  }

}