fern_evaluator.hpp

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#pragma once
 
#include <pcl/common/common.h>
#include <pcl/ml/feature_handler.h>
#include <pcl/ml/ferns/fern.h>
#include <pcl/ml/stats_estimator.h>
 
#include <vector>
 
namespace pcl {
 
template <class FeatureType,
          class DataSet,
          class LabelType,
          class ExampleIndex,
          class NodeType>
FernEvaluator<FeatureType, DataSet, LabelType, ExampleIndex, NodeType>::FernEvaluator()
{}
 
template <class FeatureType,
          class DataSet,
          class LabelType,
          class ExampleIndex,
          class NodeType>
void
FernEvaluator<FeatureType, DataSet, LabelType, ExampleIndex, NodeType>::evaluate(
    pcl::Fern<FeatureType, NodeType>& fern,
    pcl::FeatureHandler<FeatureType, DataSet, ExampleIndex>& feature_handler,
    pcl::StatsEstimator<LabelType, NodeType, DataSet, ExampleIndex>& stats_estimator,
    DataSet& data_set,
    std::vector<ExampleIndex>& examples,
    std::vector<LabelType>& label_data)
{
  const std::size_t num_of_examples = examples.size();
  const std::size_t num_of_branches = stats_estimator.getNumOfBranches();
  const std::size_t num_of_features = fern.getNumOfFeatures();
 
  label_data.resize(num_of_examples);
 
  std::vector<std::vector<float>> results(num_of_features);
  std::vector<std::vector<unsigned char>> flags(num_of_features);
  std::vector<std::vector<unsigned char>> branch_indices(num_of_features);
 
  for (std::size_t feature_index = 0; feature_index < num_of_features;
       ++feature_index) {
    results[feature_index].reserve(num_of_examples);
    flags[feature_index].reserve(num_of_examples);
    branch_indices[feature_index].reserve(num_of_examples);
 
    feature_handler.evaluateFeature(fern.accessFeature(feature_index),
                                    data_set,
                                    examples,
                                    results[feature_index],
                                    flags[feature_index]);
    stats_estimator.computeBranchIndices(results[feature_index],
                                         flags[feature_index],
                                         fern.accessThreshold(feature_index),
                                         branch_indices[feature_index]);
  }
 
  for (std::size_t example_index = 0; example_index < num_of_examples;
       ++example_index) {
    std::size_t node_index = 0;
    for (std::size_t feature_index = 0; feature_index < num_of_features;
         ++feature_index) {
      node_index *= num_of_branches;
      node_index += branch_indices[feature_index][example_index];
    }
 
    label_data[example_index] = stats_estimator.getLabelOfNode(fern[node_index]);
  }
}
 
template <class FeatureType,
          class DataSet,
          class LabelType,
          class ExampleIndex,
          class NodeType>
void
FernEvaluator<FeatureType, DataSet, LabelType, ExampleIndex, NodeType>::evaluateAndAdd(
    pcl::Fern<FeatureType, NodeType>& fern,
    pcl::FeatureHandler<FeatureType, DataSet, ExampleIndex>& feature_handler,
    pcl::StatsEstimator<LabelType, NodeType, DataSet, ExampleIndex>& stats_estimator,
    DataSet& data_set,
    std::vector<ExampleIndex>& examples,
    std::vector<LabelType>& label_data)
{
  const std::size_t num_of_examples = examples.size();
  const std::size_t num_of_branches = stats_estimator.getNumOfBranches();
  const std::size_t num_of_features = fern.getNumOfFeatures();
 
  std::vector<std::vector<float>> results(num_of_features);
  std::vector<std::vector<unsigned char>> flags(num_of_features);
  std::vector<std::vector<unsigned char>> branch_indices(num_of_features);
 
  for (std::size_t feature_index = 0; feature_index < num_of_features;
       ++feature_index) {
    results[feature_index].reserve(num_of_examples);
    flags[feature_index].reserve(num_of_examples);
    branch_indices[feature_index].reserve(num_of_examples);
 
    feature_handler.evaluateFeature(fern.accessFeature(feature_index),
                                    data_set,
                                    examples,
                                    results[feature_index],
                                    flags[feature_index]);
    stats_estimator.computeBranchIndices(results[feature_index],
                                         flags[feature_index],
                                         fern.accessThreshold(feature_index),
                                         branch_indices[feature_index]);
  }
 
  for (std::size_t example_index = 0; example_index < num_of_examples;
       ++example_index) {
    std::size_t node_index = 0;
    for (std::size_t feature_index = 0; feature_index < num_of_features;
         ++feature_index) {
      node_index *= num_of_branches;
      node_index += branch_indices[feature_index][example_index];
    }
 
    label_data[example_index] = stats_estimator.getLabelOfNode(fern[node_index]);
  }
}
 
template <class FeatureType,
          class DataSet,
          class LabelType,
          class ExampleIndex,
          class NodeType>
void
FernEvaluator<FeatureType, DataSet, LabelType, ExampleIndex, NodeType>::getNodes(
    pcl::Fern<FeatureType, NodeType>& fern,
    pcl::FeatureHandler<FeatureType, DataSet, ExampleIndex>& feature_handler,
    pcl::StatsEstimator<LabelType, NodeType, DataSet, ExampleIndex>& stats_estimator,
    DataSet& data_set,
    std::vector<ExampleIndex>& examples,
    std::vector<NodeType*>& nodes)
{
  const std::size_t num_of_examples = examples.size();
  const std::size_t num_of_branches = stats_estimator.getNumOfBranches();
  const std::size_t num_of_features = fern.getNumOfFeatures();
 
  nodes.reserve(num_of_examples);
 
  std::vector<std::vector<float>> results(num_of_features);
  std::vector<std::vector<unsigned char>> flags(num_of_features);
  std::vector<std::vector<unsigned char>> branch_indices(num_of_features);
 
  for (std::size_t feature_index = 0; feature_index < num_of_features;
       ++feature_index) {
    results[feature_index].reserve(num_of_examples);
    flags[feature_index].reserve(num_of_examples);
    branch_indices[feature_index].reserve(num_of_examples);
 
    feature_handler.evaluateFeature(fern.accessFeature(feature_index),
                                    data_set,
                                    examples,
                                    results[feature_index],
                                    flags[feature_index]);
    stats_estimator.computeBranchIndices(results[feature_index],
                                         flags[feature_index],
                                         fern.accessThreshold(feature_index),
                                         branch_indices[feature_index]);
  }
 
  for (std::size_t example_index = 0; example_index < num_of_examples;
       ++example_index) {
    std::size_t node_index = 0;
    for (std::size_t feature_index = 0; feature_index < num_of_features;
         ++feature_index) {
      node_index *= num_of_branches;
      node_index += branch_indices[feature_index][example_index];
    }
 
    nodes.push_back(&(fern[node_index]));
  }
}
 
} // namespace pcl