def _build_from_category_spacy_doc_iter(self, category_doc_iter):
        '''
        Parameters
        ----------
        category_doc_iter : iterator of (string category name, spacy.tokens.doc.Doc) pairs

        Returns
        ----------
        t : TermDocMatrix
        '''
        term_idx_store = IndexStore()
        category_idx_store = IndexStore()
        metadata_idx_store = IndexStore()
        X, mX, y = self._get_features_and_labels_from_documents_and_indexes \
            (category_doc_iter,
             category_idx_store,
             term_idx_store,
             metadata_idx_store)
        return TermDocMatrix(X,
                             mX,
                             y,
                             term_idx_store=term_idx_store,
                             category_idx_store=category_idx_store,
                             metadata_idx_store=metadata_idx_store)