Add class AbstractFeatureVector.

cpp/subprojects/common/include/mlrl/common/input/feature_vector_common.hpp

@@ -0,0 +1,59 @@
+/*
+ * @author Michael Rapp ([email protected])
+ */
+#pragma once
+
+#include "mlrl/common/data/vector_dok_binary.hpp"
+#include "mlrl/common/input/feature_vector.hpp"
+
+#include <memory>
+
+/**
+ * An abstract base class for all feature vectors that store the values of training examples for a certain feature. It
+ * allows to keep track of the indices of examples with missing feature values.
+ */
+class AbstractFeatureVector : public IFeatureVector {
+    private:
+
+        BinaryDokVector missingIndices_;
+
+    public:
+
+        virtual ~AbstractFeatureVector() override {};
+
+        /**
+         * An iterator that provides read-only access to the indices of examples with missing feature values.
+         */
+        typedef BinaryDokVector::index_const_iterator missing_index_const_iterator;
+
+        /**
+         * Returns a `missing_index_const_iterator` to the beginning of the indices of examples with missing feature
+         * values.
+         *
+         * @return A `missing_index_const_iterator` to the beginning
+         */
+        missing_index_const_iterator missing_indices_cbegin() const;
+
+        /**
+         * Returns a `missing_index_const_iterator` to the end of the indices of examples with missing feature values.
+         *
+         * @return A `missing_index_const_iterator` to the end
+         */
+        missing_index_const_iterator missing_indices_cend() const;
+
+        /**
+         * Sets whether the example at a specific index is missing a feature value or not.
+         *
+         * @param index     The index of the example
+         * @param missing   True, if the example at the given index is missing a feature value, false otherwise
+         */
+        void setMissing(uint32 index, bool missing);
+
+        /**
+         * Returns whether the example at a specific index is missing a feature value or not.
+         *
+         * @param index The index of the example
+         * @return      True, if the example at the given index is missing a feature value, false otherwise
+         */
+        bool isMissing(uint32 index) const;
+};

cpp/subprojects/common/meson.build

@@ -40,6 +40,7 @@ source_files = [
     'src/mlrl/common/input/feature_type_numerical.cpp',
     'src/mlrl/common/input/feature_type_ordinal.cpp',
     'src/mlrl/common/input/feature_vector.cpp',
+    'src/mlrl/common/input/feature_vector_common.cpp',
     'src/mlrl/common/input/label_matrix_c_contiguous.cpp',
     'src/mlrl/common/input/label_matrix_csc.cpp',
     'src/mlrl/common/input/label_matrix_csr.cpp',