AI Glossary
The complete dictionary of Artificial Intelligence
Block Cross-Validation
Specialized cross-validation technique that divides data into contiguous blocks rather than random samples, thereby preserving local dependency structures in spatial or temporal data.
Temporal Blocks
Consecutive chronological segments used in cross-validation to maintain the integrity of temporal dependencies and prevent contamination of future information into the past.
Spatial Blocks
Contiguous geographical regions defined to preserve spatial correlations during model evaluation, thus avoiding underestimation of error due to spatial autocorrelation.
Local Dependency
Statistical relationship between observations close in space or time, requiring specialized evaluation techniques to avoid apparent over-performance bias.
Spatio-Temporal Cross-Validation
Combined approach that simultaneously considers spatial and temporal dependency structures, using blocks defined in both dimensions for robust evaluation.
Block Partitioning
Method of dividing datasets into contiguous segments according to spatial or temporal criteria, ensuring the preservation of local correlation structures.
Sliding Block Cross-Validation
Variant where test blocks move sequentially through the data, allowing continuous evaluation while maintaining temporal integrity of training sets.
Overlapping Block Cross-Validation
Technique using blocks with overlapping areas to reduce the variance of error estimation while controlling the bias-variance trade-off.
Stationary Time Series
Temporal process whose statistical properties remain constant over time, simplifying but not guaranteeing the use of blocks in cross-validation.
Spatial Heterogeneity
Variation of statistical relationships or data distributions across different geographical regions, requiring adaptive block validation.
Adaptive Block Cross-Validation
Approach where the size and shape of blocks are dynamically adjusted according to local dependency characteristics detected in the data.
Neighborhood Matrix
Mathematical structure defining proximity relationships between spatial observations, used to guide block formation in spatial cross-validation.
Hierarchical Block Cross-Validation
Multi-level method organizing blocks according to a hierarchical structure, allowing evaluation at different spatial or temporal scales.
Weighted Block Cross-Validation
Variant assigning weights to observations based on their distance to block boundaries, reducing edge effects in generalization error estimation.
Multi-scale Block Cross-Validation
Technique evaluating models at multiple levels of spatial or temporal granularity to capture dependencies at different resolution scales.
Sequential Block Cross-Validation
Approach ordering blocks according to a logical sequence (temporal or spatial), essential for models where the order of observations influences learning.
Block Cross-Validation with Constraints
Method incorporating specific constraints (e.g., geographical boundaries, temporal events) in block formation to respect the inherent structure of the data.
Bayesian Block Cross-Validation
Probabilistic approach integrating prior knowledge about dependency structures in the definition and evaluation of cross-validation blocks.