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Explains how compositional world models reuse mechanisms, objects, and skills to generalize systematically to novel combinations.
Aleatoric and epistemic uncertainty shape world models, from multimodal transitions and ensembles to calibration and uncertainty propagation through rollouts.
Differentiable simulators, graph networks, neural ODEs, and operator learning add physical structure to world models for efficient data use and planning.
Covers structural causal models, the do-operator, counterfactuals, confounding, and invariance.
Embed physics into world models using Lagrangian and Hamiltonian architectures, contact and friction constraints, conservation laws.
Explains how coordinate frames, depth estimation, SLAM, occupancy grids, and neural fields give world models geometric state that stays stable under egomotion.
Explains how world models represent the agent itself: agent-environment boundaries, learned body schemas, capabilities, affordances.
Explains how object-centric and relational world models use slots, graphs, and message passing to predict object dynamics, track identity.
Explains how world models maintain state under partial observability using recurrent memory, gated LSTMs and GRUs, attention, episodic storage.
Explains how autoencoders, VAEs, and VQ-VAEs compress raw observations into compact latent states for world models.
Explains what a world model's state must preserve and discard: predictive versus control sufficiency, bisimulation, minimal abstractions.
Explains how sensors shape world models: calibration, synchronization, noise, missing and delayed observations.
Explains how learned world models power planning, policy optimization, and value learning in RL, plus model bias, rollout error.
Covers control as inference, optimality variables, soft Bellman updates, variational free energy, active inference, preferences, ambiguity, and epistemic value.
Covers classical planning and optimal control: state-space search with A*, dynamic programming, LQR.
Covers system identification through excitation, regression, prediction-error and subspace methods, neural dynamics, rollout tests, and model validation.
Bayesian filters turn noisy observations into belief states. Covers Kalman, extended Kalman, unscented Kalman, particle, and learned update methods.
Explains how MDPs, POMDPs, policies, values, and belief states formalize sequential decisions when dynamics are uncertain and observations hide the true state.
Covers math behind world models: conditional distributions, Markov transitions, stability, attractors, and information theory for sufficient states.
Trace the four intellectual lineages behind world models: neuroscience, cybernetics, AI planning, and foundation models.
Map the world-model design space across four axes: explicit versus implicit, state representation, deterministic versus stochastic dynamics.
Covers the four-criteria world-model qualification test covering state sufficiency, action conditioning, counterfactual validity.
Explains what a world model is through operational and philosophical definitions, its core components, and a hands-on pendulum example testing prediction.
Build a minimal world model in PyTorch with encoder, transition model, decoder, and reward head. Topics include filtering, imagination, CEM planning, and MPC.
Deploy language models responsibly through staged rollouts, tiered access control, content filtering, and production monitoring systems.
Covers long-form text generation with outline-based planning, hierarchical decomposition, entity tracking.
Covers test-time compute strategies: multiple sampling, iterative refinement, compute-optimal inference, and inference-time scaling laws for language models.
Explains how learning rate warmup stabilizes early training by gradually increasing the learning rate, with theory, linear warmup.
Explains how deduplication removes exact copies and near-duplicates from training corpora using SHA-256 hashing, Jaccard similarity over character shingles.
Reduce LLM hallucination using retrieval augmentation, self-consistency decoding, DPO training, and calibrated uncertainty expression.
Reverse-engineer transformer networks into human-understandable algorithms by identifying circuits, induction heads, and mechanistic discoveries.
Examines the open problems, promising research areas, benchmark gaps, and community priorities shaping the future of language AI.
Explains how language AI reshapes labor markets, widens or narrows access gaps, drives regulatory frameworks.
Examines the core alignment challenges facing modern LLMs: scalable oversight, alignment tax, goal mis-specification, reward hacking.
Covers four methods for detecting LLM hallucinations: entailment-based scoring, knowledge base verification, self-consistency checks.
Explains how probing classifiers reveal what linguistic information is encoded in neural network representations.
Explains how language models hallucinate: intrinsic and extrinsic hallucination, factual errors, fabrication, and inconsistency with NLI-based detection.
Examines the structural causes of LLM hallucinations: training data noise, exposure bias, knowledge gaps, and generation pressure in language models.
Explains how language models cause harm through stereotyping, erasure, and demeaning associations, with measurement methods and concrete examples.
Examines emerging language model capabilities including in-context learning, chain-of-thought reasoning, world models, planning and agency.
Covers the key mathematical definitions of algorithmic fairness, from demographic parity to equalized odds.
Examines efficient transformer architectures, hardware co-design, inference optimizations like speculative decoding.
Examine the physical, statistical, and economic limits of LLM scaling, the data wall crisis, and architectural innovations like MoE and inference-time compute.
Practical techniques for reducing demographic bias in language models: data balancing, embedding debiasing, adversarial training.
Measure bias in language models using embedding association tests, generation metrics, classification fairness measures, and standard benchmarks.
Write model cards that communicate intended use, training data, evaluation results, and limitations for responsible AI deployment.
Explains how language models inherit demographic, cultural, and occupational bias from training data, and why they amplify these biases beyond the data.
Explains how token-level watermarking embeds hidden statistical signals into LLM outputs, enabling cryptographically verifiable attribution and AI provenance.
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I created this space so readers can learn together, ask questions, and make sense of difficult ideas.