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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def batch_size(self, size):
 """ Sets the batch size, in case this classifier is a batch predictor. :param size: the size of the batch :type size: str """

        if self.is_batchpredictor:
            javabridge.call(self.jobject, "setBatchSize", "(Ljava/lang/String;)V", size)