Papers › K-Deep Simplex: Deep Manifold Learning via Local Dictionaries
K-Deep Simplex: Deep Manifold Learning via Local Dictionaries
Pranay Tankala, Abiy Tasissa, James M. Murphy, Demba Ba
We propose K-Deep Simplex(KDS) which, given a set of data points, learns a dictionary comprising synthetic landmarks, along with representation coefficients supported on a simplex. KDS employs a local weighted ℓ₁ penalty that encourages each data point to represent itself as a convex combination of nearby landmarks. We solve the proposed optimization program using alternating minimization and design an efficient, interpretable autoencoder using algorithm unrolling. We theoretically analyze the proposed program by relating the weighted ℓ₁ penalty in KDS to a weighted ℓ₀ program. Assuming that the data are generated from a Delaunay triangulation, we prove the equivalence of the weighted ℓ₁ and weighted ℓ₀ programs. We further show the stability of the representation coefficients under mild geometrical assumptions. If the representation coefficients are fixed, we prove that the sub-problem of minimizing over the dictionary yields a unique solution. Further, we show that low-dimensional representations can be efficiently obtained from the covariance of the coefficient matrix. Experiments show that the algorithm is highly efficient and performs competitively on synthetic and real data sets.
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