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Everything about Diffusion map

Geometric algorithm

Diffusion maps is a dimensionality reduction or feature extraction algorithm introduced by Coifman and Lafon which computes a family of embeddings of a data set into Euclidean space whose coordinates can be computed from the eigenvectors and eigenvalues of a diffusion operator on the data. The Euclidean distance between points in the embedded space is equal to the "diffusion distance" between probability distributions centered at those points. Different from linear dimensionality reduction methods such as principal component analysis (PCA), diffusion maps are part of the family of nonlinear dimensionality reduction methods which focus on discovering the underlying manifold that the data has been sampled from. By integrating local similarities at different scales, diffusion maps give a global description of the data-set. Compared with other methods, the diffusion map algorithm is robust to noise perturbation and computationally inexpensive. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Diffusion mapA 5-minute orientation
  2. Skim a recent paper: Quantitative mapping of the brain’s structural connectivity using diffusion MRI tractography: A reviewInfluential work since 2022
  3. Pick up a classic book: An Atlas of World AffairsThe most-reprinted book on the subject
  4. Read the landmark paper: Determination of reaction coordinates via locally scaled diffusion mapCited 249 times
  5. Go sideways: Nonlinear dimensionality reductionA closely related topic
  6. Go sideways: Spectral clusteringA closely related topic

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🏆 Landmark papers (most cited)

🆕 Influential since 2022

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