有人能解释这些来自.evaluate（）的结果标签吗？请详细说明。谢谢!!!
{'loss': 0.68134964,
'accuracy': 0.5939525,
'labels/prediction_mean': 0.47619653,
'labels/actual_label_mean': 0.40604752,
'accuracy/baseline_label_mean': 0.40604752,
'auc': 0.6067142,
'auc_precision_recall': 0.50581825,
'accuracy/threshold_0.500000_mean': 0.5939525,
'precision/positive_threshold_0.500000_mean': 0.5,
'recall/positive_threshold_0.500000_mean': 0.5319149,
'global_step': 250}