Fix the bug due to deprecation of np.float
Created by: didi-hou
This PR fixed the bug due to the deprecation of np.float. It replaced the np.float with python built-in float and it's equivalent to np.float64
Created by: didi-hou
This PR fixed the bug due to the deprecation of np.float. It replaced the np.float with python built-in float and it's equivalent to np.float64