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* @deprecated ID mapping is not reliable!
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public <O extends FeatureVector<O, ?>> KernelMatrix(final PrimitiveSimilarityFunction<? super O, DoubleDistance> kernelFunction, final Relation<? extends O> database) {
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public <O extends FeatureVector<?>> KernelMatrix(final PrimitiveSimilarityFunction<? super O, DoubleDistance> kernelFunction, final Relation<? extends O> database) {
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this(kernelFunction, database, DBIDUtil.ensureArray(database.getDBIDs()));