In situ adaptive tabulation

In Situ Adaptive Tabulation (ISAT) is an algorithm for the approximation of nonlinear relationships. ISAT is based on multiple linear regressions that are dynamically added as additional information is discovered. The technique is adaptive as it adds new linear regressions dynamically to a store of possible retrieval points. ISAT maintains error control by defining finer granularity in regions of increased nonlinearity. A binary tree search transverses cutting hyper-planes to locate a local linear approximation. ISAT is an alternative to artificial neural networks that is receiving increased attention for desirable characteristics, namely:

• scales quadratically with increased dimension
• approximates functions with discontinuities
• maintains explicit bounds on approximation error
• controls local derivatives of the approximating function
• delivers new data training without re-optimization

ISAT was first proposed by Stephen Pope for computational reduction of turbulent combustion simulation. It has been extended to a general framework that accepts general input and output data.

See also

• Artificial neural network
• Predictive analytics
• Radial basis function network
• Recurrent neural networks
• Support vector machine
• Tensor product network

External links

• In Situ Adaptive Tabulation (ISAT) in Turbulent Combustion
• Tutorial Overview of ISAT
• ISAT in Fluent