def METHOD_NAME(self, raw_data):
    """Tag out possible mention from raw data.
    raw_data: data string list
    """
    processed = []
    for entry in raw_data:
        entry = entry["text"].lower()
        tagged = self.annotator.tag(entry)
        if tagged:
            start, end, mention = tagged
            marked_entry = {}
            marked_entry["mention"] = mention
            marked_entry["context_left"] = entry[:start]
            marked_entry["context_right"] = entry[end:]
            marked_entry["label"] = "unknown"
            marked_entry["label_id"] = -1
            processed.append(marked_entry)
        else:  # Handle failure
            print('ner failed for {}'.format(entry))
    return processed