org.apache.spark.linalg.distributed.DistributedMatrix.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.
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package org.apache.spark.linalg.distributed

import breeze.linalg.{DenseMatrix => BDM}

import org.apache.spark.annotation.Since

/**
 * Represents a distributively stored matrix backed by one or more RDDs.
 */

trait DistributedMatrix extends Serializable {

  /** Gets or computes the number of rows. */

  def numRows(): Long

  /** Gets or computes the number of columns. */

  def numCols(): Long

  /** Collects data and assembles a local dense breeze matrix (for test only). */
  def toBreeze(): BDM[Double]
}