def parse_train_csv(data_file):
    """

    Returns:
        X: a list of tweets
        y: a list of labels corresponding to the tweets

    """
    with open(data_file, 'r') as fd:
        data = [l.strip().split('\t') for l in fd.readlines()][1:]
    X = [d[2] for d in data]
    y = [d[1] for d in data]
    return X, y