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/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
/**
 * Sparse vectors and their operations.  Sparse vectors map arbitrary long keys to values sparsely
 * and efficiently.  The keys can be negative.
 *
 * 

Sparse vectors come in three flavors. Read-only vectors ({@link SparseVector}); * this type is the base of the remaining types for each vector, and provides a read-only * interface to the vector. Immutable vectors ({@link ImmutableSparseVector}) are immutable and cannot be * changed once created. They can also be freely shared between threads. Finally, mutable vectors * ({@link MutableSparseVector}) * are mutable and not thread-safe. * *

This design allows read-only operations to be performed on any type of vector, while allowing * components to specifically work with and store vectors guaranteed to be immutable. * *

The {@link Vectors} class provides utility methods for working with vectors. * * @see Sparse Vector tutorial */ package org.grouplens.lenskit.vectors;





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