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I assume your service calls are not returning, what you expect. Or what is your problem? - please clarify.

Genereally: Your code has to return a nav_msgs/OccupancyGrid. It seems to return, whatever map_params.map_callback() returns. (which overwrites the GetMap(), btw) Maybe you want to check that. See https://wiki.ros.org/rospy/Overview/Services#Providing_services for other options. e. g.

return {'map': GetMap()}