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You seem to have forgotten to call imu_client. Also, the imu_client argument is unused, so it is not needed for the time being. I think the following changes may move the situation forward.

...
# wait for this service to be running
def imu_client():
    rospy.wait_for_service('imu_service')
    imu_client = rospy.ServiceProxy('imu_service', ImuResponse)

if __name__ == "__main__":
    imu_client()

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