You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: vl_test_bnorm.m
    path of file: ./repos/2016_person_re-ID/matlab/xtest
    
    the code of the file until where you have to start completion: %% 
% Test function to compare nn_bnorm and its GPU/CPU implementation with
% using VLFEAT
%%

gpu = false;
gpu = true 
    
function to compare nn_bnorm and its GPU/CPU implementation with
% using VLFEAT
%%

gpu = false;
gpu = true ;

T = 1 ;
x = randn(64,64,32,32,'single') ;
g = randn(32,1,'single') ;
b = randn(32,1,'single') ;

if gpu
  x = gpuArray(x) ;
  g = gpuArray(g) ;
  b = gpuArray(b) ;
end