Initializes the ExampleSet with the path of data :param data_path: string; the path of data :param vocab: object; :param doc_max_timesteps: int; the maximum sentence number of a document, each example should pad sentences to this length :param sent_max_len: int; the
(self, data_path, vocab, doc_max_timesteps, sent_max_len, filter_word_path, w2s_path, w2d_path)