T. Tony Cai, Xin Lu Tan, OPTIMAL ESTIMATION OF A QUADRATIC FUNCTIONAL UNDER THE GAUSSIAN TWO-SEQUENCE MODEL, Statistica Sinica, Vol. 27, No. 2 (April 2017), pp. 879-906 ...

In that study, we applied a computational model of V1 based on the temporal slowness principle 21 to natural-image-patch sequences, which yielded a set of quadratic forms representing non-linear ...

A sequence which increases or decreases by the same amount each time is called a linear sequence. Non-linear sequences do not increase by a constant amount. They include quadratic sequences.

More information: Vittorio Erba et al, Bilinear Sequence Regression: A Model for Learning from Long Sequences of High-Dimensional Tokens, Physical Review X (2025). DOI: 10.1103/l4p2-vrxt ...