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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 cluster_assignments(self):
 """ Return an array of cluster assignments corresponding to the most recent set of instances clustered. :return: the cluster assignments :rtype: ndarray """

        array = javabridge.call(self.jobject, "getClusterAssignments", "()[D")
        if array is None:
            return None
        else:
            return javabridge.get_env().get_double_array_elements(array)