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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.spark.util.random
import java.util.Random
import cern.jet.random.Poisson
import org.scalatest.{BeforeAndAfter, FunSuite}
import org.scalatest.mock.EasyMockSugar
class RandomSamplerSuite extends FunSuite with BeforeAndAfter with EasyMockSugar {
val a = List(1, 2, 3, 4, 5, 6, 7, 8, 9)
var random: Random = _
var poisson: Poisson = _
before {
random = mock[Random]
poisson = mock[Poisson]
}
test("BernoulliSamplerWithRange") {
expecting {
for(x <- Seq(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9)) {
random.nextDouble().andReturn(x)
}
}
whenExecuting(random) {
val sampler = new BernoulliSampler[Int](0.25, 0.55)
sampler.rng = random
assert(sampler.sample(a.iterator).toList == List(3, 4, 5))
}
}
test("BernoulliSamplerWithRangeInverse") {
expecting {
for(x <- Seq(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9)) {
random.nextDouble().andReturn(x)
}
}
whenExecuting(random) {
val sampler = new BernoulliSampler[Int](0.25, 0.55, true)
sampler.rng = random
assert(sampler.sample(a.iterator).toList === List(1, 2, 6, 7, 8, 9))
}
}
test("BernoulliSamplerWithRatio") {
expecting {
for(x <- Seq(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9)) {
random.nextDouble().andReturn(x)
}
}
whenExecuting(random) {
val sampler = new BernoulliSampler[Int](0.35)
sampler.rng = random
assert(sampler.sample(a.iterator).toList == List(1, 2, 3))
}
}
test("BernoulliSamplerWithComplement") {
expecting {
for(x <- Seq(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9)) {
random.nextDouble().andReturn(x)
}
}
whenExecuting(random) {
val sampler = new BernoulliSampler[Int](0.25, 0.55, true)
sampler.rng = random
assert(sampler.sample(a.iterator).toList == List(1, 2, 6, 7, 8, 9))
}
}
test("BernoulliSamplerSetSeed") {
expecting {
random.setSeed(10L)
}
whenExecuting(random) {
val sampler = new BernoulliSampler[Int](0.2)
sampler.rng = random
sampler.setSeed(10L)
}
}
test("PoissonSampler") {
expecting {
for(x <- Seq(0, 1, 2, 0, 1, 1, 0, 0, 0)) {
poisson.nextInt().andReturn(x)
}
}
whenExecuting(poisson) {
val sampler = new PoissonSampler[Int](0.2)
sampler.rng = poisson
assert(sampler.sample(a.iterator).toList == List(2, 3, 3, 5, 6))
}
}
}
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