A Geometric Perspective on Machine Learning
[Pages:47]A Geometric Perspective on Machine Learning
Partha Niyogi The University of Chicago
Thanks: M. Belkin, A. Caponnetto, X. He, I. Matveeva, H. Narayanan, V. Sindhwani, S. Smale, S. Weinberger
A Geometric Perspective onMachine Learning ? p.1
High Dimensional Data
When can we avoid the curse of dimensionality?
Smoothness
rate
(1/n)
s d
splines,kernel methods, L2 regularization...
Sparsity
wavelets, L1 regularization, LASSO, compressed sensing..
Geometry
graphs, simplicial complexes, laplacians, diffusions
A Geometric Perspective onMachine Learning ? p.2
Geometry and Data: The Central Dogma
Distribution of natural data is non-uniform and concentrates around low-dimensional structures. The shape (geometry) of the distribution can be exploited for efficient learning.
A Geometric Perspective onMachine Learning ? p.3
Manifold Learning
Learning when data M RN Clustering: M {1, . . . , k}
connected components, min cut
Classification: M {-1, +1}
P on M ? {-1, +1}
Dimensionality Reduction: f : M Rn n ................
................
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