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* examples and test * fixes * fixes * cleanup
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98
...es/src/main/java/com/amazon/randomcutforest/examples/dynamicinference/DynamicDensity.java
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| /* | ||
| * Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"). | ||
| * You may not use this file except in compliance with the License. | ||
| * A copy of the License is located at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * or in the "license" file accompanying this file. This file 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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|
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| package com.amazon.randomcutforest.examples.dynamicinference; | ||
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| import com.amazon.randomcutforest.RandomCutForest; | ||
| import com.amazon.randomcutforest.examples.Example; | ||
| import com.amazon.randomcutforest.returntypes.DensityOutput; | ||
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| import java.io.BufferedWriter; | ||
| import java.io.FileWriter; | ||
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| import static com.amazon.randomcutforest.testutils.ExampleDataSets.generate; | ||
| import static com.amazon.randomcutforest.testutils.ExampleDataSets.rotateClockWise; | ||
| import static java.lang.Math.PI; | ||
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|
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| public class DynamicDensity implements Example { | ||
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| public static void main(String[] args) throws Exception { | ||
| new DynamicDensity().run(); | ||
| } | ||
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| @Override | ||
| public String command() { | ||
| return "dynamic_sampling"; | ||
| } | ||
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| @Override | ||
| public String description() { | ||
| return "shows two potential use of dynamic density computations; estimating density as well " + | ||
| "as its directional components"; | ||
| } | ||
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| /** | ||
| * plot the dynamic_density_example using any tool in gnuplot one can plot the | ||
| * directions to higher density via do for [i=0:358:2] {plot | ||
| * "dynamic_density_example" index (i+1) u 1:2:3:4 w vectors t ""} or the raw | ||
| * density at the points via do for [i=0:358:2] {plot "dynamic_density_example" | ||
| * index i w p pt 7 palette t ""} | ||
| * | ||
| * @throws Exception | ||
| */ | ||
| @Override | ||
| public void run() throws Exception { | ||
| int newDimensions = 2; | ||
| long randomSeed = 123; | ||
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| RandomCutForest newForest = RandomCutForest.builder().numberOfTrees(100).sampleSize(256) | ||
| .dimensions(newDimensions).randomSeed(randomSeed).timeDecay(1.0 / 800).centerOfMassEnabled(true) | ||
| .build(); | ||
| String name = "dynamic_density_example"; | ||
| BufferedWriter file = new BufferedWriter(new FileWriter(name)); | ||
| double[][] data = generate(1000); | ||
| double[] queryPoint; | ||
| for (int degree = 0; degree < 360; degree += 2) { | ||
| for (double[] datum : data) { | ||
| newForest.update(rotateClockWise(datum, -2 * PI * degree / 360)); | ||
| } | ||
| for (double[] datum : data) { | ||
| queryPoint = rotateClockWise(datum, -2 * PI * degree / 360); | ||
| DensityOutput density = newForest.getSimpleDensity(queryPoint); | ||
| double value = density.getDensity(0.001, 2); | ||
| file.append(queryPoint[0] + " " + queryPoint[1] + " " + value + "\n"); | ||
| } | ||
| file.append("\n"); | ||
| file.append("\n"); | ||
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| for (double x = -0.95; x < 1; x += 0.1) { | ||
| for (double y = -0.95; y < 1; y += 0.1) { | ||
| DensityOutput density = newForest.getSimpleDensity(new double[] { x, y }); | ||
| double aboveInY = density.getDirectionalDensity(0.001, 2).low[1]; | ||
| double belowInY = density.getDirectionalDensity(0.001, 2).high[1]; | ||
| double toTheLeft = density.getDirectionalDensity(0.001, 2).high[0]; | ||
| double toTheRight = density.getDirectionalDensity(0.001, 2).low[0]; | ||
| double len = Math.sqrt(aboveInY * aboveInY + belowInY * belowInY + toTheLeft * toTheLeft | ||
| + toTheRight * toTheRight); | ||
| file.append(x + " " + y + " " + ((toTheRight - toTheLeft) * 0.05 / len) + " " | ||
| + ((aboveInY - belowInY) * 0.05 / len) + "\n"); | ||
| } | ||
| } | ||
| file.append("\n"); | ||
| file.append("\n"); | ||
| } | ||
| file.close(); | ||
| } | ||
| } |
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