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CobwebTM is a low-parameter lifelong hierarchical topic modeling approach that adapts the Cobweb algorithm to continuous document embeddings, enabling unsupervised topic discovery and dynamic hierarchical organization without predefining topic counts. The method combines incremental symbolic concept formation with pretrained representations to achieve strong topic coherence while avoiding catastrophic forgetting.
OpenAI presents implicit generation and generalization methods for energy-based models (EBMs) that use Langevin dynamics for iterative refinement to generate samples without explicit generator networks. The approach offers advantages including adaptive computation time, flexibility in learning disconnected data modes, and built-in compositionality through product of experts.