Hard-to-read logs caused by multiple callbacks

[echen5503]

Multiple Callbacks printing during training can make logs messy.

Step      Train loss                                  Test loss                                   Test metric
0         [1.59e+01, 9.45e-02, 4.36e-01, 1.62e-01]    [1.80e+01, 9.45e-02, 4.36e-01, 1.62e-01]    [4.03e-01, 1.39e+00]
0 [1.00e+00]
200 [00:01<00:29, 130.01it/s]
250       [1.39e-01, 2.20e-02, 1.12e-01, 1.95e-02]    [1.09e-01, 2.20e-02, 1.12e-01, 1.95e-02]    [5.13e-03, 1.57e-01]
250 [1.08e+00]
400 [00:03<00:27, 129.96it/s]
500       [2.32e-02, 9.74e-03, 8.38e-02, 6.00e-03]    [2.14e-02, 9.74e-03, 8.38e-02, 6.00e-03]    [3.25e-03, 1.25e-01]
500 [1.30e+00]
600 [00:04<00:25, 131.01it/s]
750       [8.03e-03, 7.10e-03, 7.58e-02, 1.07e-03]    [1.06e-02, 7.10e-03, 7.58e-02, 1.07e-03]    [3.83e-03, 1.35e-01]
750 [1.39e+00]
800 [00:06<00:24, 132.58it/s]
1000      [4.69e-03, 7.54e-03, 7.32e-02, 5.79e-04]    [6.32e-03, 7.54e-03, 7.32e-02, 5.79e-04]    [4.16e-03, 1.41e-01]
1000 [1.46e+00]
1000 [00:07<00:22, 133.28it/s]
1200 [00:08<00:20, 133.98it/s]
1250      [3.54e-03, 7.10e-03, 6.57e-02, 7.26e-04]    [3.55e-03, 1.11e-02, 6.57e-02, 9.88e-02]    [5.39e-03, 1.61e-01]
1250 [1.58e+00]
1400 [00:10<00:19, 134.47it/s]