rospy init_node() inside imported file

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I have a similar project, it works like that:

1. Inside the project folder, I have a folder called packages, with a __init__.py inside. It's empty, just to make the module available

2. In the packages folder yet, a file called initialize.py, where I have:

   import rospy as _rospy from std_msgs.msg import String as _String, Empty as _Empty

   def init():

       _rospy.init_node('controller', anonymous=True)
       global _sub
       _sub = _rospy.Subscriber("/model_name", _String, _nameCallback)
       global _pub
       _pub = _rospy.Publisher(_controllerName+'/encoder_updated',_Empty)
   

3. In the root folder, my script that imports the initialize library:

   import packages.initialize

   initialize.init()