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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 infer_schema(self, stream, namespace=None):
 """ Queries the Kronos server and fetches the inferred schema for the requested stream. """

    return self._make_request(self._infer_schema_url,
                              data={'stream': stream,
                                    'namespace': namespace or self.namespace})