cdef class Detection:
    def __init__(self, double x, double y, double w, double h, int cls):
        self.x = x
        self.y = y
        self.w = w
        self.h = h
        self.cls = cls

cdef class Annotation:
    def __init__(self, bytes image_bytes, float time, list[Detection] detections):
        self.image = image_bytes
        self.time = time
        self.detections = detections