Return the data contained within a specified corpus.

def load_corpus(*data_file_paths):
    """
    Return the data contained within a specified corpus.
    """
    for file_path in data_file_paths:
        corpus = []
        corpus_data = read_corpus(file_path)

        conversations = corpus_data.get('conversations', [])
        corpus.extend(conversations)

        categories = corpus_data.get('categories', [])

        yield corpus, categories, file_path