1 files changed, 86 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/datasource/filter/SparseFloatVectorRandomProjectionFilter.java b/src/de/lmu/ifi/dbs/elki/datasource/filter/SparseFloatVectorRandomProjectionFilter.java
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+++ b/src/de/lmu/ifi/dbs/elki/datasource/filter/SparseFloatVectorRandomProjectionFilter.java
@@ -0,0 +1,86 @@
+package de.lmu.ifi.dbs.elki.datasource.filter;
+/*
+This file is part of ELKI:
+Environment for Developing KDD-Applications Supported by Index-Structures
+
+Copyright (C) 2011
+Ludwig-Maximilians-Universität München
+Lehr- und Forschungseinheit für Datenbanksysteme
+ELKI Development Team
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import java.util.Collections;
+import java.util.Map;
+
+import de.lmu.ifi.dbs.elki.data.SparseFloatVector;
+import de.lmu.ifi.dbs.elki.data.type.SimpleTypeInformation;
+import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
+import de.lmu.ifi.dbs.elki.data.type.VectorFieldTypeInformation;
+import de.lmu.ifi.dbs.elki.utilities.Util;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
+
+/**
+ * <p>Parser to project the ParsingResult obtained by a suitable base parser
+ * onto a randomly selected subset of attributes.</p>
+ *
+ * @author Arthur Zimek
+ */
+public class SparseFloatVectorRandomProjectionFilter extends AbstractRandomFeatureSelectionFilter<SparseFloatVector> {
+  /**
+   * Constructor.
+   *
+   * @param dim
+   */
+  public SparseFloatVectorRandomProjectionFilter(int dim) {
+    super(dim);
+  }
+
+  @Override
+  protected SparseFloatVector filterSingleObject(SparseFloatVector obj) {
+    return Util.project(obj, selectedAttributes);
+  }
+
+  @Override
+  protected SimpleTypeInformation<? super SparseFloatVector> getInputTypeRestriction() {
+    return TypeUtil.SPARSE_FLOAT_FIELD;
+  }
+
+  @SuppressWarnings("unused")
+  @Override
+  protected SimpleTypeInformation<? super SparseFloatVector> convertedType(SimpleTypeInformation<SparseFloatVector> in) {
+    final Map<Integer, Float> emptyMap = Collections.emptyMap();
+    return new VectorFieldTypeInformation<SparseFloatVector>(SparseFloatVector.class, k, new SparseFloatVector(emptyMap, k));
+  }
+  
+  /**
+   * Parameterization class.
+   *
+   * @author Erich Schubert
+   *
+   * @apiviz.exclude
+   */
+  public static class Parameterizer extends AbstractRandomFeatureSelectionFilter.Parameterizer<SparseFloatVector> {
+    @Override
+    protected void makeOptions(Parameterization config) {
+      super.makeOptions(config);
+    }
+
+    @Override
+    protected SparseFloatVectorRandomProjectionFilter makeInstance() {
+      return new SparseFloatVectorRandomProjectionFilter(k);
+    }
+  }
+}
+\ No newline at end of file