This class provides multiple options for specifying how the affinity matrix should be computed both in terms of the number of neighbors and the weights of the edges to those neighbors.
Due to the full density of the affinity matrix, the matrix is always written to disk, rather than stored in memory. This class also provides support for computing the affinity matrix off-core, i.e. without needing to load the matrix entirely into memory. If the off-core method is specified, the returned matrix will also be on disk.
This class is thread safe. @see LocalityPreservingProjection
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