Convert Float32MultiArray msg to numpy ndarray

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Hello,

my node subscribes to a list with std_msgs/Float32MultiArray[] messages. The list has 3 elements. Each element is a Float32MultiArray[] and has a dimension of (512,512)

This never changes. I need to feed this message to another programm. But this programm requires numpy ndarrays as input as it uses the numpy.tobytes() function. Therefore I need to convert this Multiarray message to a numpy ndarray. What is the best way to do this?

Thanks