we wish to learn the matrix parameters and from the training set {yxto this endconsider minimizing the training loss tr ( xbs- ( xb) where tr(*is the trace of matrix (ashow that the minimizer of the training lossdenoted bsatisfies the normal equationsxx xy (bnoting that ( xb( xbn ei > = explain why ( xb )( xb bb : is method-of-moments estimator of sjust like the one given in (