コード例 #1
0
  /**
   * The core implementation of the search.
   *
   * @param root The root word to search from. Traditionally, this is the root of the sentence.
   * @param candidateFragments The callback for the resulting sentence fragments. This is a
   *     predicate of a triple of values. The return value of the predicate determines whether we
   *     should continue searching. The triple is a triple of
   *     <ol>
   *       <li>The log probability of the sentence fragment, according to the featurizer and the
   *           weights
   *       <li>The features along the path to this fragment. The last element of this is the
   *           features from the most recent step.
   *       <li>The sentence fragment. Because it is relatively expensive to compute the resulting
   *           tree, this is returned as a lazy {@link Supplier}.
   *     </ol>
   *
   * @param classifier The classifier for whether an arc should be on the path to a clause split, a
   *     clause split itself, or neither.
   * @param featurizer The featurizer to use. Make sure this matches the weights!
   * @param actionSpace The action space we are allowed to take. Each action defines a means of
   *     splitting a clause on a dependency boundary.
   */
  protected void search(
      // The root to search from
      IndexedWord root,
      // The output specs
      final Predicate<Triple<Double, List<Counter<String>>, Supplier<SentenceFragment>>>
          candidateFragments,
      // The learning specs
      final Classifier<ClauseSplitter.ClauseClassifierLabel, String> classifier,
      Map<String, ? extends List<String>> hardCodedSplits,
      final Function<Triple<State, Action, State>, Counter<String>> featurizer,
      final Collection<Action> actionSpace,
      final int maxTicks) {
    // (the fringe)
    PriorityQueue<Pair<State, List<Counter<String>>>> fringe = new FixedPrioritiesPriorityQueue<>();
    // (avoid duplicate work)
    Set<IndexedWord> seenWords = new HashSet<>();

    State firstState =
        new State(null, null, -9000, null, x -> {}, true); // First state is implicitly "done"
    fringe.add(Pair.makePair(firstState, new ArrayList<>(0)), -0.0);
    int ticks = 0;

    while (!fringe.isEmpty()) {
      if (++ticks > maxTicks) {
        //        System.err.println("WARNING! Timed out on search with " + ticks + " ticks");
        return;
      }
      // Useful variables
      double logProbSoFar = fringe.getPriority();
      assert logProbSoFar <= 0.0;
      Pair<State, List<Counter<String>>> lastStatePair = fringe.removeFirst();
      State lastState = lastStatePair.first;
      List<Counter<String>> featuresSoFar = lastStatePair.second;
      IndexedWord rootWord = lastState.edge == null ? root : lastState.edge.getDependent();

      // Register thunk
      if (lastState.isDone) {
        if (!candidateFragments.test(
            Triple.makeTriple(
                logProbSoFar,
                featuresSoFar,
                () -> {
                  SemanticGraph copy = new SemanticGraph(tree);
                  lastState
                      .thunk
                      .andThen(
                          x -> {
                            // Add the extra edges back in, if they don't break the tree-ness of the
                            // extraction
                            for (IndexedWord newTreeRoot : x.getRoots()) {
                              if (newTreeRoot != null) { // what a strange thing to have happen...
                                for (SemanticGraphEdge extraEdge :
                                    extraEdgesByGovernor.get(newTreeRoot)) {
                                  assert Util.isTree(x);
                                  //noinspection unchecked
                                  addSubtree(
                                      x,
                                      newTreeRoot,
                                      extraEdge.getRelation().toString(),
                                      tree,
                                      extraEdge.getDependent(),
                                      tree.getIncomingEdgesSorted(newTreeRoot));
                                  assert Util.isTree(x);
                                }
                              }
                            }
                          })
                      .accept(copy);
                  return new SentenceFragment(copy, assumedTruth, false);
                }))) {
          break;
        }
      }

      // Find relevant auxilliary terms
      SemanticGraphEdge subjOrNull = null;
      SemanticGraphEdge objOrNull = null;
      for (SemanticGraphEdge auxEdge : tree.outgoingEdgeIterable(rootWord)) {
        String relString = auxEdge.getRelation().toString();
        if (relString.contains("obj")) {
          objOrNull = auxEdge;
        } else if (relString.contains("subj")) {
          subjOrNull = auxEdge;
        }
      }

      // Iterate over children
      // For each outgoing edge...
      for (SemanticGraphEdge outgoingEdge : tree.outgoingEdgeIterable(rootWord)) {
        // Prohibit indirect speech verbs from splitting off clauses
        // (e.g., 'said', 'think')
        // This fires if the governor is an indirect speech verb, and the outgoing edge is a ccomp
        if (outgoingEdge.getRelation().toString().equals("ccomp")
            && ((outgoingEdge.getGovernor().lemma() != null
                    && INDIRECT_SPEECH_LEMMAS.contains(outgoingEdge.getGovernor().lemma()))
                || INDIRECT_SPEECH_LEMMAS.contains(outgoingEdge.getGovernor().word()))) {
          continue;
        }
        // Get some variables
        String outgoingEdgeRelation = outgoingEdge.getRelation().toString();
        List<String> forcedArcOrder = hardCodedSplits.get(outgoingEdgeRelation);
        if (forcedArcOrder == null && outgoingEdgeRelation.contains(":")) {
          forcedArcOrder =
              hardCodedSplits.get(
                  outgoingEdgeRelation.substring(0, outgoingEdgeRelation.indexOf(":")) + ":*");
        }
        boolean doneForcedArc = false;
        // For each action...
        for (Action action :
            (forcedArcOrder == null ? actionSpace : orderActions(actionSpace, forcedArcOrder))) {
          // Check the prerequisite
          if (!action.prerequisitesMet(tree, outgoingEdge)) {
            continue;
          }
          if (forcedArcOrder != null && doneForcedArc) {
            break;
          }
          // 1. Compute the child state
          Optional<State> candidate =
              action.applyTo(tree, lastState, outgoingEdge, subjOrNull, objOrNull);
          if (candidate.isPresent()) {
            double logProbability;
            ClauseClassifierLabel bestLabel;
            Counter<String> features =
                featurizer.apply(Triple.makeTriple(lastState, action, candidate.get()));
            if (forcedArcOrder != null && !doneForcedArc) {
              logProbability = 0.0;
              bestLabel = ClauseClassifierLabel.CLAUSE_SPLIT;
              doneForcedArc = true;
            } else if (features.containsKey("__undocumented_junit_no_classifier")) {
              logProbability = Double.NEGATIVE_INFINITY;
              bestLabel = ClauseClassifierLabel.CLAUSE_INTERM;
            } else {
              Counter<ClauseClassifierLabel> scores = classifier.scoresOf(new RVFDatum<>(features));
              if (scores.size() > 0) {
                Counters.logNormalizeInPlace(scores);
              }
              String rel = outgoingEdge.getRelation().toString();
              if ("nsubj".equals(rel) || "dobj".equals(rel)) {
                scores.remove(
                    ClauseClassifierLabel.NOT_A_CLAUSE); // Always at least yield on nsubj and dobj
              }
              logProbability = Counters.max(scores, Double.NEGATIVE_INFINITY);
              bestLabel = Counters.argmax(scores, (x, y) -> 0, ClauseClassifierLabel.CLAUSE_SPLIT);
            }

            if (bestLabel != ClauseClassifierLabel.NOT_A_CLAUSE) {
              Pair<State, List<Counter<String>>> childState =
                  Pair.makePair(
                      candidate.get().withIsDone(bestLabel),
                      new ArrayList<Counter<String>>(featuresSoFar) {
                        {
                          add(features);
                        }
                      });
              // 2. Register the child state
              if (!seenWords.contains(childState.first.edge.getDependent())) {
                //            System.err.println("  pushing " + action.signature() + " with " +
                // argmax.first.edge);
                fringe.add(childState, logProbability);
              }
            }
          }
        }
      }

      seenWords.add(rootWord);
    }
    //    System.err.println("Search finished in " + ticks + " ticks and " + classifierEvals + "
    // classifier evaluations.");
  }
コード例 #2
0
  public List<Pair<String, Double>> selectWeightedKeysWithSampling(
      ActiveLearningSelectionCriterion criterion, int numSamples, int seed) {
    List<Pair<String, Double>> result = new ArrayList<>();
    forceTrack("Sampling Keys");
    log("" + numSamples + " to collect");

    // Get uncertainty
    forceTrack("Computing Uncertainties");
    Counter<String> weightCounter = uncertainty(criterion);
    assert weightCounter.equals(uncertainty(criterion));
    endTrack("Computing Uncertainties");
    // Compute some statistics
    startTrack("Uncertainty Histogram");
    //    log(new Histogram(weightCounter, 50).toString());  // removed to make the release easier
    // (Histogram isn't in CoreNLP)
    endTrack("Uncertainty Histogram");
    double totalCount = weightCounter.totalCount();
    Random random = new Random(seed);

    // Flatten counter
    List<String> keys = new LinkedList<>();
    List<Double> weights = new LinkedList<>();
    List<String> zeroUncertaintyKeys = new LinkedList<>();
    for (Pair<String, Double> elem :
        Counters.toSortedListWithCounts(
            weightCounter,
            (o1, o2) -> {
              int value = o1.compareTo(o2);
              if (value == 0) {
                return o1.first.compareTo(o2.first);
              } else {
                return value;
              }
            })) {
      if (elem.second != 0.0
          || weightCounter.totalCount() == 0.0
          || weightCounter.size() <= numSamples) { // ignore 0 probability weights
        keys.add(elem.first);
        weights.add(elem.second);
      } else {
        zeroUncertaintyKeys.add(elem.first);
      }
    }

    // Error check
    if (Utils.assertionsEnabled()) {
      for (Double elem : weights) {
        if (!(elem >= 0 && !Double.isInfinite(elem) && !Double.isNaN(elem))) {
          throw new IllegalArgumentException("Invalid weight: " + elem);
        }
      }
    }

    // Sample
    SAMPLE_ITER:
    for (int i = 1; i <= numSamples; ++i) { // For each sample
      if (i % 1000 == 0) {
        // Debug log
        log("sampled " + (i / 1000) + "k keys");
        // Recompute total count to mitigate floating point errors
        totalCount = 0.0;
        for (double val : weights) {
          totalCount += val;
        }
      }
      if (weights.size() == 0) {
        continue;
      }
      assert totalCount >= 0.0;
      assert weights.size() == keys.size();
      double target = random.nextDouble() * totalCount;
      Iterator<String> keyIter = keys.iterator();
      Iterator<Double> weightIter = weights.iterator();
      double runningTotal = 0.0;
      while (keyIter.hasNext()) { // For each candidate
        String key = keyIter.next();
        double weight = weightIter.next();
        runningTotal += weight;
        if (target <= runningTotal) { // Select that sample
          result.add(Pair.makePair(key, weight));
          keyIter.remove();
          weightIter.remove();
          totalCount -= weight;
          continue SAMPLE_ITER; // continue sampling
        }
      }
      // We should get here only if the keys list is empty
      warn(
          "No more uncertain samples left to draw from! (target="
              + target
              + " totalCount="
              + totalCount
              + " size="
              + keys.size());
      assert keys.size() == 0;
      if (zeroUncertaintyKeys.size() > 0) {
        result.add(Pair.makePair(zeroUncertaintyKeys.remove(0), 0.0));
      } else {
        break;
      }
    }

    endTrack("Sampling Keys");
    return result;
  }