DFA + residual-branch penalty test: seed=456, lam=0.001
  ep 0: ||h_L||=8.890e+00 ||g_2||=9.971e-04 acc=0.0928
  ep 1: ||h_L||=1.332e+03 ||g_2||=6.768e-06 eval_acc=0.3350 test_acc=0.3299
  ep 10: ||h_L||=8.773e+03 ||g_2||=1.743e-06 eval_acc=0.3691 test_acc=0.3606
  ep 20: ||h_L||=1.678e+04 ||g_2||=1.177e-06 eval_acc=0.3760 test_acc=0.3639
  ep 30: ||h_L||=2.409e+04 ||g_2||=9.326e-07 eval_acc=0.3750 test_acc=0.3647
  ep 40: ||h_L||=3.023e+04 ||g_2||=8.219e-07 eval_acc=0.3662 test_acc=0.3579