Check the 10th column of the first token to determine if the file contains
    NER tags

def is_ner(tag):
    """
    Check the 10th column of the first token to determine if the file contains
    NER tags
    """
    tag_match = re.match("([A-Z_]+)-([A-Z_]+)", tag)
    if tag_match:
        return True
    elif tag == "O":
        return True
    else:
        return False