1 package edu.uci.iotproject.evaluation;
3 import edu.uci.iotproject.analysis.TriggerTrafficExtractor;
4 import edu.uci.iotproject.analysis.UserAction;
5 import edu.uci.iotproject.io.TriggerTimesFileReader;
7 import java.io.BufferedReader;
9 import java.io.FileReader;
10 import java.io.IOException;
11 import java.time.Instant;
12 import java.util.ArrayList;
13 import java.util.List;
14 import java.util.Optional;
17 * Utility for comparing detected events to logged (actual) events.
19 * @author Janus Varmarken {@literal <jvarmark@uci.edu>}
20 * @author Rahmadi Trimananda {@literal <rtrimana@uci.edu>}
22 public class DetectionResultsAnalyzer {
24 public static void main(String[] args) throws IOException {
25 // -------------------------------------- Parse the input files --------------------------------------
27 String triggerTimesFile = args[0];
28 // Read the trigger times.
29 // The trigger times file does not contain event types as we initially assumed that we would just be alternating
30 // between ON and OFF.
31 List<Instant> triggerTimestamps = new TriggerTimesFileReader().readTriggerTimes(triggerTimesFile, false);
32 // Now generate user actions based on this alternating ON/OFF pattern.
33 List<UserAction> triggers = new ArrayList<>();
34 for (int i = 0; i < triggerTimestamps.size(); i++) {
35 // NOTE: assumes triggers alternate between ON and OFF
36 UserAction.Type actionType = i % 2 == 0 ? UserAction.Type.TOGGLE_ON : UserAction.Type.TOGGLE_OFF;
37 triggers.add(new UserAction(actionType, triggerTimestamps.get(i)));
39 // Read the detection output file, assuming a format as specified in UserAction.toString()
40 File detectionOutputFile = new File(args[1]);
41 List<UserAction> detectedEvents = new ArrayList<>();
42 try (BufferedReader br = new BufferedReader(new FileReader(detectionOutputFile))) {
44 while ((s = br.readLine()) != null) {
45 detectedEvents.add(UserAction.fromString(s));
49 // ----------------- Now ready to compare the detected events with the logged events -----------------
51 // To contain all detected events that could be mapped to a trigger
52 List<UserAction> truePositives = new ArrayList<>();
53 for (UserAction detectedEvent : detectedEvents) {
54 Optional<UserAction> matchingTrigger = triggers.stream()
55 .filter(t -> t.getType() == detectedEvent.getType() &&
56 t.getTimestamp().isBefore(detectedEvent.getTimestamp()) &&
57 t.getTimestamp().plusMillis(TriggerTrafficExtractor.INCLUSION_WINDOW_MILLIS).
58 isAfter(detectedEvent.getTimestamp())
60 matchingTrigger.ifPresent(mt -> {
61 // We've consumed the trigger (matched it with a detected event), so remove it so we don't match with
62 // another detected event.
64 // The current detected event was a true positive as we could match it with a trigger.
65 truePositives.add(detectedEvent);
68 // Now the false positives are those elements in detectedEvents that are not in truePositives
69 List<UserAction> falsePositives = new ArrayList<>();
70 falsePositives.addAll(detectedEvents);
71 falsePositives.removeAll(truePositives);
72 // Print the results...
73 System.out.println("---------- False negatives (events that where not detected) ----------");
74 for (UserAction missing : triggers) {
75 System.out.println(missing);
77 System.out.println("Total of " + Integer.toString(triggers.size()));
79 System.out.println("---------- False positives (detected, but no matching trigger) ----------");
80 for (UserAction fp : falsePositives) {
81 System.out.println(fp);
83 System.out.println("Total of " + Integer.toString(falsePositives.size()));