如何将带有对象dtype的Numpy 2D数组转换为普通的二维浮点数组

As part of broader program I am working on, I ended up with object arrays with strings, 3D coordinates and etc all mixed. I know object arrays might not be very favorite in comparison to structured arrays but I am hoping to get around this without changing a lot of codes.As part of broader program I am working on, I e