FEATURES/PROBLEMS:¶ ↑
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Applying transforms to query vectors
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Allow objects to be passed in as transforms.
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Hashes might be enough, but a faster data structure might be a good option.
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Detect the optimal dimension reduction in LSA.
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This needs some benchmark. Low number of dimensions can be effective enough.
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nlp.stanford.edu/IR-book/html/htmledition/latent-semantic-indexing-1.html
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Implement Probabilistic latent semantic analysis
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Implement Latent Dirichlet Allocation
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Matrix transformer has to popout the matrix of VectorSpace::Model and reassign it, get rid of this.