def METHOD_NAME(dpath: str):
    """
    Following WoW, we have overlap in train, valid, and test seen but none in test
    unseen. Do an 80:10:5:5 split between train, valid, test_seen, test_unseen or as
    close to it.
    ~205 documents for test_unseen to do this, and movies 1 and 3 have 90 and 117
    movies, respectively, which is about that
    """
    random.seed(42)
    cdir = os.path.join(dpath, "conversations")
    new = {"train": {}, "valid": {}, "test_seen": {}, "test_unseen": {}}
    for fold in ["test", "valid", "train"]:
        with PathManager.open(os.path.join(cdir, f"{fold}_deduped.json")) as f:
            data = json.load(f)
        for k, v in data.items():
            if v["wikiDocumentIdx"] == 1 or v["wikiDocumentIdx"] == 3:
                new["test_unseen"][k] = v
            else:
                rand = random.randint(1, 95)
                if rand <= 80:
                    new["train"][k] = v
                elif rand <= 90:
                    new["valid"][k] = v
                else:
                    new["test_seen"][k] = v
    for fold in new:
        with PathManager.open(
            os.path.join(cdir, f"{fold}_split_seen_unseen.json"), "w+"
        ) as f:
            json.dump(new[fold], f, indent=2)
        c_cnt = len(new[fold])
        logger.info(f"Seen/unseen {fold} conversation count: {c_cnt}")