def __init__(self, function, argument):
        assert isinstance(function, Expression), "%s is not an Expression" % function
        assert isinstance(argument, Expression), "%s is not an Expression" % argument
        self.function = function
        self.argument = argument
Convert a ROS compatible message (sensor_msgs.Image) to a
dataset/ETHPy150Open nltk/nltk/nltk/sem/logic.py/ApplicationExpression.__init__--crossover with--dataset/ETHPy150Open rapyuta/rce/rce-core/rce/util/converters/image.py/ImageConverter.encode