Acronyms

Summary

Acronyms are short forms that recur across the wiki. Use this page when reading a page quickly and follow the linked concept page when the acronym names a method or metric that needs more detail.

Common acronyms

Acronym	Expansion	Area
ALS	Alternating least squares	Recommendation systems
ANN	Approximate nearest-neighbour search	Search
ARIMA	Autoregressive integrated moving average	Forecasting
BM25	Best Matching 25 retrieval function	Search
CNN	Convolutional neural network	Deep learning
DQN	Deep Q-network	Reinforcement learning
ETL / ELT	Extract-transform-load / extract-load-transform	Data engineering
GAN	Generative adversarial network	Deep learning
GBM	Gradient-boosted machine (trees)	Classical ML
GRU	Gated recurrent unit	Deep learning
JEPA	Joint Embedding Predictive Architecture	Video understanding
LLM	Large language model	Generative AI
LSTM	Long short-term memory	Deep learning
MAP	Maximum a posteriori (estimation)	Probability
MDP	Markov decision process	Reinforcement learning
MLE	Maximum likelihood estimation	Probability
NDCG	Normalized discounted cumulative gain	Search
NER	Named entity recognition	NLP
OCR	Optical character recognition	NLP
PCA	Principal component analysis	Classical ML
RAG	Retrieval-augmented generation	Generative AI
RNN	Recurrent neural network	Deep learning
SLO	Service-level objective	MLOps
SVD	Singular value decomposition	Mathematical foundations
SVM	Support vector machine	Classical ML
TF-IDF	Term frequency-inverse document frequency	Search
VAE	Variational autoencoder	Deep learning
VLM	Vision-language model	Generative AI

Retrieval metric acronyms

The retrieval metrics mean reciprocal rank and normalized discounted cumulative gain are linked from the metric reference page because their short forms are validated elsewhere in the corpus.

Usage guidance

• Expand an acronym on first use in long-form pages.
• Prefer the canonical concept title in headings.
• Link to glossary, notation, or the canonical concept page when the short form alone is ambiguous.
• Avoid inventing project-specific acronyms unless the page defines them.

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