DFA + residual-branch penalty test: seed=123, lam=0.001
  ep 0: ||h_L||=8.791e+00 ||g_2||=9.848e-04 acc=0.0957
  ep 1: ||h_L||=1.165e+03 ||g_2||=7.637e-06 eval_acc=0.3242 test_acc=0.3179
  ep 10: ||h_L||=8.474e+03 ||g_2||=1.661e-06 eval_acc=0.3652 test_acc=0.3519
  ep 20: ||h_L||=1.658e+04 ||g_2||=1.026e-06 eval_acc=0.3662 test_acc=0.3632
  ep 30: ||h_L||=2.394e+04 ||g_2||=8.435e-07 eval_acc=0.3564 test_acc=0.3537
  ep 40: ||h_L||=3.023e+04 ||g_2||=7.463e-07 eval_acc=0.3652 test_acc=0.3590