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Everything about Representation collapse

Phenomenon in machine learning

Representation collapse is a phenomenon in machine learning and representation learning where a model maps different inputs to the same or very similar embeddings, which means it loses important information about how the data is spread out. It is frequently encountered in self-supervised learning, especially within contrastive and non-contrastive frameworks, when training objectives or model architectures do not maintain variance across representations. Collapse results in degenerate solutions characterized by uninformative learned features, significantly impairing downstream task performance. Various techniques have been proposed to mitigate representation collapse, including the use of negative samples, architectural asymmetry, stop-gradient operations, variance regularization, and redundancy reduction objectives, as seen in methods such as SimCLR, BYOL, and VICReg. Comprehending and averting representation collapse is regarded as a fundamental challenge in the advancement of stable and efficient self-supervised learning systems. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Representation collapseA 5-minute orientation
  2. Skim a recent paper: Latent Space Collapse in Materials Representation Learning: A Systems-Level Conceptual AnalysisInfluential work since 2022
  3. Pick up a classic book: Red MoonThe most-reprinted book on the subject
  4. Read the landmark paper: Single-force representation of earthquakes due to landslides or the collapse of cavernsCited 38 times
  5. Go sideways: Self-supervised learningA closely related topic
  6. Go sideways: Representation learningA closely related topic

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