How to use the flair.file_utils.cached_path function in flair

def _download_wassa_if_not_there(emotion, data_folder, dataset_name):
    for split in ["train", "dev", "test"]:

        data_file = data_folder / f"{emotion}-{split}.txt"

        if not data_file.is_file():

            if split == "train":
                url = f"http://saifmohammad.com/WebDocs/EmoInt%20Train%20Data/{emotion}-ratings-0to1.train.txt"
            if split == "dev":
                url = f"http://saifmohammad.com/WebDocs/EmoInt%20Dev%20Data%20With%20Gold/{emotion}-ratings-0to1.dev.gold.txt"
            if split == "test":
                url = f"http://saifmohammad.com/WebDocs/EmoInt%20Test%20Gold%20Data/{emotion}-ratings-0to1.test.gold.txt"

            path = cached_path(url, Path("datasets") / dataset_name)

            with open(path, "r") as f:
                with open(data_file, "w") as out:
                    next(f)
                    for line in f:
                        fields = line.split("\t")
                        out.write(f"__label__{fields[3].rstrip()} {fields[1]}\n")

            os.remove(path)

model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-forward
        elif model.lower() == "german-forward" or model.lower() == "de-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-backward
        elif model.lower() == "german-backward" or model.lower() == "de-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish forward
        elif model.lower() == "polish-forward" or model.lower() == "pl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-forward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish backward
        elif model.lower() == "polish-backward" or model.lower() == "pl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-backward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Slovenian forward
        elif model.lower() == "slovenian-forward" or model.lower() == "sl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Slovenian backward
        elif model.lower() == "slovenian-backward" or model.lower() == "sl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Bulgarian forward

model = cached_path(base_path, cache_dir=cache_dir)

        # mix-english-forward
        elif model.lower() == "mix-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-english-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-english-backward
        elif model.lower() == "mix-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-english-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-forward
        elif model.lower() == "german-forward" or model.lower() == "de-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-backward
        elif model.lower() == "german-backward" or model.lower() == "de-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish forward
        elif model.lower() == "polish-forward" or model.lower() == "pl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-forward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish backward
        elif model.lower() == "polish-backward" or model.lower() == "pl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-backward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-backward
        elif model.lower() == "german-backward" or model.lower() == "de-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish forward
        elif model.lower() == "polish-forward" or model.lower() == "pl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-forward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish backward
        elif model.lower() == "polish-backward" or model.lower() == "pl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-backward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Slovenian forward
        elif model.lower() == "slovenian-forward" or model.lower() == "sl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Slovenian backward
        elif model.lower() == "slovenian-backward" or model.lower() == "sl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Bulgarian forward
        elif model.lower() == "bulgarian-forward" or model.lower() == "bg-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-bg-small-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Bulgarian backward
        elif model.lower() == "bulgarian-backward" or model.lower() == "bg-backward":

not allow re-use of once computed embeddings that do not fit into memory
        :param cache_directory: if cache_directory is not set, the cache will be written to ~/.flair/embeddings. otherwise the cache
                is written to the provided directory.
        """
        super().__init__()

        cache_dir = Path("embeddings")

        # multilingual forward (English, German, French, Italian, Dutch, Polish)
        if model.lower() == "multi-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-multi-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # multilingual backward  (English, German, French, Italian, Dutch, Polish)
        elif model.lower() == "multi-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-multi-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # news-english-forward
        elif model.lower() == "news-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-news-english-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # news-english-backward
        elif model.lower() == "news-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-news-english-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # news-english-forward
        elif model.lower() == "news-forward-fast":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-news-english-forward-1024-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

old_base_path = (
            "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/"
        )
        base_path = (
            "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/"
        )
        embeddings_path_v4 = (
            "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/"
        )
        embeddings_path_v4_1 = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4.1/"

        cache_dir = Path("embeddings")

        # GLOVE embeddings
        if embeddings.lower() == "glove" or embeddings.lower() == "en-glove":
            cached_path(f"{old_base_path}glove.gensim.vectors.npy", cache_dir=cache_dir)
            embeddings = cached_path(
                f"{old_base_path}glove.gensim", cache_dir=cache_dir
            )

        # TURIAN embeddings
        elif embeddings.lower() == "turian" or embeddings.lower() == "en-turian":
            cached_path(
                f"{embeddings_path_v4_1}turian.vectors.npy", cache_dir=cache_dir
            )
            embeddings = cached_path(
                f"{embeddings_path_v4_1}turian", cache_dir=cache_dir
            )

        # KOMNINOS embeddings
        elif embeddings.lower() == "extvec" or embeddings.lower() == "en-extvec":
            cached_path(

base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-fr-charlm-backward.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Czech forward
        elif model.lower() == "czech-forward" or model.lower() == "cs-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-cs-large-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Czech backward
        elif model.lower() == "czech-backward" or model.lower() == "cs-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-cs-large-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Portuguese forward
        elif model.lower() == "portuguese-forward" or model.lower() == "pt-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-pt-forward.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Portuguese backward
        elif model.lower() == "portuguese-backward" or model.lower() == "pt-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-pt-backward.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        elif not Path(model).exists():
            raise ValueError(
                f'The given model "{model}" is not available or is not a valid path.'
            )

        self.name = str(model)
        self.static_embeddings = detach

        from flair.models import LanguageModel

        self.lm = LanguageModel.load_language_model(model)

if type(base_path) == str:
            base_path: Path = Path(base_path)

        # this dataset name
        dataset_name = self.__class__.__name__.lower()

        # default dataset folder is the cache root
        if not base_path:
            base_path = Path(flair.cache_root) / "datasets"
        data_folder = base_path / dataset_name

        # download data if necessary
        ud_path = "https://raw.githubusercontent.com/UniversalDependencies/UD_Slovak-SNK/master"
        cached_path(f"{ud_path}/sk_snk-ud-dev.conllu", Path("datasets") / dataset_name)
        cached_path(f"{ud_path}/sk_snk-ud-test.conllu", Path("datasets") / dataset_name)
        cached_path(
            f"{ud_path}/sk_snk-ud-train.conllu", Path("datasets") / dataset_name
        )

        super(UD_SLOVAK, self).__init__(data_folder, in_memory=in_memory)

model = cached_path(base_path, cache_dir=cache_dir)

        # news-english-forward
        elif model.lower() == "news-forward-fast":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-news-english-forward-1024-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # news-english-backward
        elif model.lower() == "news-backward-fast":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-news-english-backward-1024-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-english-forward
        elif model.lower() == "mix-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-english-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-english-backward
        elif model.lower() == "mix-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-english-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-forward
        elif model.lower() == "german-forward" or model.lower() == "de-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-forward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # mix-german-backward
        elif model.lower() == "german-backward" or model.lower() == "de-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-mix-german-backward-v0.2rc.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-forward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # common crawl Polish backward
        elif model.lower() == "polish-backward" or model.lower() == "pl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings/lm-polish-backward-v0.2.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Slovenian forward
        elif model.lower() == "slovenian-forward" or model.lower() == "sl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Slovenian backward
        elif model.lower() == "slovenian-backward" or model.lower() == "sl-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-sl-large-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Bulgarian forward
        elif model.lower() == "bulgarian-forward" or model.lower() == "bg-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-bg-small-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Bulgarian backward
        elif model.lower() == "bulgarian-backward" or model.lower() == "bg-backward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.3/lm-bg-small-backward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)

        # Dutch forward
        elif model.lower() == "dutch-forward" or model.lower() == "nl-forward":
            base_path = "https://s3.eu-central-1.amazonaws.com/alan-nlp/resources/embeddings-v0.4/lm-nl-large-forward-v0.1.pt"
            model = cached_path(base_path, cache_dir=cache_dir)
        # Dutch backward
        elif model.lower() == "dutch-backward" or model.lower() == "nl-backward":