Generalized Approximate Message Passing: Relations and Derivations

This tech report details a collection of results related to the Generalised Approximate Message Passing (GAMP) algorithm. It is a summary of the results that the authors have found critical in understanding the GAMP algorithm. In particular, emphasis is on the details that are crucial in implementing the GAMP algorithm on a computer but which are oftentimes left out from the literature focusing on the more theoretical aspects of GAMP.