Formal Formulation for BCP (2) Let trn (wr,y(xj,y)∈!2m) be the inner-level training function given the t-th fold training dataset and valt, y(x,y)∈2a be the t-th outer-level validation loss function given its validation datasetFormal Formulation for BCP (2) Let be the inner-level training function given the t-th fold training dataset and be the t-th outer-level validation loss function given its validation dataset