system: You are an expert security code reviewer. You will be shown a source code file. Your task is to name the single function or class that contains the specified CWE vulnerability.

OUTPUT FORMAT: Respond with the exact function or class name (no parentheses, no qualifiers, no module prefixes), wrapped in \boxed{...}. Example: `\boxed{salted_hmac}`. Output the boxed name ONLY -- no explanation, no other text.

user: ```python
""" ``sklearn_xarray.datasets`` """

import numpy as np
import pandas as pd
import xarray as xr


def load_dummy_dataarray():
    """ Load a DataArray for demonstration purposes. """

    return xr.DataArray(
        np.random.random((100, 10)),
        coords={"sample": range(100), "feature": range(10)},
        dims=("sample", "feature"),
    )


def load_dummy_dataset():
    """ Load a Dataset for demonstration purposes. """

    return xr.Dataset(
        {"var_1": (["sample", "feature"], np.random.random((100, 10)))},
        coords={"sample": range(100), "feature": range(10)},
    )


def load_digits_dataarray(load_images=False, nan_probability=0):
    """ Load a the 'digits' dataset from sklearn as a DataArray.

    Parameters
    ----------
    load_images : bool, optional
        If true, the DataArray will contain the two-dimensional images as
        data instead of the vectorized samples.

    nan_probability : float between 0 and 1
        The probability with which a sample is injected with NaN values. For
        demonstration purposes only.
    """

    from sklearn.datasets import load_digits

    if load_images:

        bunch = load_digits()
        data = bunch.images

        if nan_probability > 0:
            for i in range(data.shape[0]):
                if np.random.rand(1) < nan_probability:
                    data[i, 0, 0] = np.nan

        return xr.DataArray(
            data,
            coords={
                "sample": range(data.shape[0]),
                "row": range(data.shape[1]),
                "col": range(data.shape[2]),
                "digit": (["sample"], bunch.target),
            },
            dims=("sample", "row", "col"),
        )

    else:

        data, target = load_digits(return_X_y=True)

        if nan_probability > 0:
            for i in range(data.shape[0]):
                if np.random.rand(1) < nan_probability:
                    data[i, 0] = np.nan

        return xr.DataArray(
            data,
            coords={
                "sample": range(data.shape[0]),
                "feature": range(data.shape[1]),
                "digit": (["sample"], target),
            },
            dims=("sample", "feature"),
        )


def load_wisdm_dataarray(
    url="http://www.cis.fordham.edu/wisdm/includes/"
    "datasets/latest/WISDM_ar_latest.tar.gz",
    file="WISDM_ar_v1.1/WISDM_ar_v1.1_raw.txt",
    folder="data/",
    tmp_file="widsm.tar.gz",
):
    """ Load the WISDM activity recognition dataset.

    Parameters
    ----------
    url : str, optional
        The URL of the dataset.

    file : str, optional
        The file containing the data.

    folder : str, optional
        The folder where the data will be downloaded and extracted to.

    tmp_file : str, optional
        The name of the temporary .tar file in the folder.

    Returns
    -------
    X: xarray DataArray
        The loaded dataset.

    """

    import os
    import tarfile
    import six.moves.urllib.request as ul

    if not os.path.isfile(os.path.join(folder, file)):
        ul.urlretrieve(url, tmp_file)
        tar = tarfile.open(tmp_file)
        tar.extractall(folder)
        tar.close()
        os.remove(tmp_file)

    column_names = ["subject", "activity", "timestamp", "x", "y", "z"]
    df = pd.read_csv(
        os.path.join(folder, file),
        header=None,
        names=column_names,
        comment=";",
    )

    time = pd.date_range(start=0, periods=df.shape[0], freq="50ms")

    coords = {
        "subject": ("sample", df.subject),
        "activity": ("sample", df.activity),
        "sample": time,
        "axis": ["x", "y", "z"],
    }

    X = xr.DataArray(df.iloc[:, 3:6], coords=coords, dims=("sample", "axis"))

    return X

```

Name the function or class in this code that contains a `CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')` vulnerability.
Answer: load_wisdm_dataarray