Chandan Singh | scattering transform

scattering transform

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some papers involving the scattering transform and similar developments bringing structure to replace learned filters

  • some of the researchers involved
    • edouard oyallan, joan bruna, stephan mallat, Helmut Bölcskei, max welling


  • benefits
    • all filters are defined
    • more interpretable
    • more biophysically plausible
  • scattering transform - computes a translation invariant repr. by cascading wavelet transforms and modulus pooling operators, which average the amplitude of iterated wavelet coefficients


initial papers


neuro style


papers by other groups

wavelet style transfer

helmut lab papers

  • Deep Convolutional Neural Networks Based on Semi-Discrete Frames (wiatowski et al. 2015)
    • allowing for different and, most importantly, general semidiscrete frames (such as, e.g., Gabor frames, wavelets, curvelets, shearlets, ridgelets) in distinct network layers
    • translation-invariant, and we develop deformation stability results
  • wiatoski_18 “A mathematical theory of deep convolutional neural networks for feature extraction
    • encompasses general convolutional transforms - general semi-discrete frames (including Weyl-Heisenberg filters, curvelets, shearlets, ridgelets, wavelets, and learned filters), general Lipschitz-continuous non-linearities (e.g., rectified linear units, shifted logistic sigmoids, hyperbolic tangents, and modulus functions), and general Lipschitz-continuous pooling operators emulating, e.g., sub-sampling and averaging
      • all of these elements can be different in different network layers.
    • translation invariance result of vertical nature in the sense of the features becoming progressively more translation-invariant with increasing network depth
    • deformation sensitivity bounds that apply to signal classes such as, e.g., band-limited functions, cartoon functions, and Lipschitz functions.
  • wiatowski_18 “Energy Propagation in Deep Convolutional Neural Networks

nano papers

  • yu_06 “A Nanoengineering Approach to Regulate the Lateral Heterogeneity of Self-Assembled Monolayers”
    • regulate heterogeneity of self-assembled monlayers
      • used nanografting + self-assembly chemistry
  • bu_10 nanografting - makes more homogenous morphology
  • fleming_09 “dendrimers”
    • scanning tunneling microscopy - provides highest spatial res
    • combat this for insulators
  • lin_12_moire
    • prob moire effect with near-field scanning optical microscopy
  • chen_12_crystallization

l2 functions

  • $L^2$ function is a function $f: X \to \mathbb{R}$ that is square integrable: $ f ^2 = \int_X f ^2 d\mu$ with respect to the measure $\mu$
    • $ f $ is its $L^2$-norm
  • **measure ** = nonnegative real function from a delta-ring F such that $m(\empty) = 0$ and $m(A) = \sum_n m(A_n)$
  • Hilbert space H: a vectors space with an innor product $<f, g>$ such that the following norm turns H into a complete metric space: $ f = \sqrt{<f, f>}$
  • diffeomorphism is an isomorphism of smooth manifolds. It is an invertible function that maps one differentiable manifold to another such that both the function and its inverse are smooth.

reversible/invertible models

unsupervised learning