<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def build(self):
		'''Builds Depoyed Classifier
		'''
		if self._clf is None:
			raise NeedToTrainExceptionBeforeDeployingException()
		return DeployedClassifier(self._category,
		                          self._term_doc_matrix._category_idx_store,
		                          self._term_doc_matrix._term_idx_store,
		                          self._term_doc_matrix_factory)