| /* |
| * Copyright 2017, Yahoo! Inc. |
| * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms. |
| */ |
| |
| package com.yahoo.sketches.pig.tuple; |
| |
| import java.util.Random; |
| |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.data.DataByteArray; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.data.TupleFactory; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| |
| import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketch; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesUpdatableSketchBuilder; |
| |
| public class ArrayOfDoublesSketchToVariancesTest { |
| |
| @Test |
| public void nullInput() throws Exception { |
| EvalFunc<Tuple> func = new ArrayOfDoublesSketchToVariances(); |
| Tuple resultTuple = func.exec(null); |
| Assert.assertNull(resultTuple); |
| } |
| |
| @Test |
| public void emptyInputTuple() throws Exception { |
| EvalFunc<Tuple> func = new ArrayOfDoublesSketchToVariances(); |
| Tuple resultTuple = func.exec(TupleFactory.getInstance().newTuple()); |
| Assert.assertNull(resultTuple); |
| } |
| |
| @Test |
| public void emptyInputSketch() throws Exception { |
| EvalFunc<Tuple> func = new ArrayOfDoublesSketchToVariances(); |
| ArrayOfDoublesUpdatableSketch sketch = new ArrayOfDoublesUpdatableSketchBuilder().build(); |
| Tuple inputTuple = PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray())); |
| Tuple resultTuple = func.exec(inputTuple); |
| Assert.assertNull(resultTuple); |
| } |
| |
| @Test |
| public void oneEntryInputSketch() throws Exception { |
| EvalFunc<Tuple> func = new ArrayOfDoublesSketchToVariances(); |
| ArrayOfDoublesUpdatableSketch sketch = new ArrayOfDoublesUpdatableSketchBuilder().build(); |
| sketch.update(1, new double[] {1}); |
| Tuple inputTuple = PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray())); |
| Tuple resultTuple = func.exec(inputTuple); |
| Assert.assertNotNull(resultTuple); |
| Assert.assertEquals(resultTuple.size(), 1); |
| Assert.assertEquals(resultTuple.get(0), 0.0); |
| } |
| |
| @Test |
| public void manyEntriesTwoValuesInputSketch() throws Exception { |
| EvalFunc<Tuple> func = new ArrayOfDoublesSketchToVariances(); |
| ArrayOfDoublesUpdatableSketch sketch = new ArrayOfDoublesUpdatableSketchBuilder().setNumberOfValues(2).build(); |
| Random rand = new Random(0); |
| int numKeys = 10000; // to saturate the sketch with default number of nominal entries (4K) |
| for (int i = 0; i < numKeys; i++ ) { |
| // two random values normally distributed with standard deviations of 1 and 10 |
| sketch.update(i, new double[] {rand.nextGaussian(), rand.nextGaussian() * 10.0}); |
| } |
| Assert.assertTrue(sketch.getRetainedEntries() >= 4096); |
| Tuple inputTuple = PigUtil.objectsToTuple(new DataByteArray(sketch.compact().toByteArray())); |
| Tuple resultTuple = func.exec(inputTuple); |
| Assert.assertNotNull(resultTuple); |
| Assert.assertEquals(resultTuple.size(), 2); |
| Assert.assertEquals((double) resultTuple.get(0), 1.0, 0.04); |
| Assert.assertEquals((double) resultTuple.get(1), 100.0, 100.0 * 0.04); // squared standard deviation within 4% |
| } |
| |
| } |