How to use the technical.MovingAverage function in technical

def create_transforms(self, configs):
        """
        Create transforms based on configs, set each transform's result address to
        this object's transform_address, so that all transformed events will be delivered
        to this object.
        """
        self.transforms = {}
        for props in configs:
            class_name = props['class']
            if(class_name == 'MovingAverage'):
                mavg = ta.MovingAverage(self.feed, props, self.transform_address)
                self.transforms[mavg.config.name] = mavg
        
        keys = copy.copy(self.transforms.keys())
        keys.append("feed") #for the raw feed
        self.data_buffer = qmsg.MergedParallelBuffer(keys) 
            
        self.buffers = {}
        for name, transform in self.transforms.iteritems():
            self.buffers[name] = []