生成vrd_roidb.npz时出现 'list' object has no attribute 'keys'问题

我使用的tf1.3, python2.7出现问题
/home/vcl/vtranse/process/vrd_pred_process.py in <module>()
     25         with open(file_path_use,'r') as f:
     26                 data=json.load(f)
---> 27                 image_name = data.keys()
     28                 len_img = len(image_name)
     29                 t = 0

AttributeError: 'list' object has no attribute 'keys'

有遇到类似的问题吗