norm = ["LIMIT_BAL", "AGE", "PAY_AMT1"]


for field in norm:
    fig, (ax_before, ax_after) = plt.subplots(1, 2, figsize=(10, 5))

    data_selected[field].hist(ax=ax_before)
    data_selected[field].apply(np.log1p).hist(ax=ax_after)

    ax_before.set(title='before np.log1p var:' + field, ylabel='frequency', xlabel='value')
    ax_after.set(title='after np.log1p var:' + field, ylabel='frequency', xlabel='value')
    fig.suptitle('Field "{}"'.format(field));