Parameters
    ----------
    corpus : Corpus
        Corpus to use.
    category : str
        Name of category column as it appears in original data frame.
    category_name : str
        Name of category to use.  E.g., "5-star reviews."
    not_category_name : str
        Name of everything that isn't in category.  E.g., "Below 5-star reviews".
    scores : np.array
        Scores to display in visualization.  Zero scores are grey.

    Remaining arguments are from `produce_scattertext_explorer`.

    Returns
    -------
        str, html of visualization

def sparse_explorer(corpus,
                    category,
                    scores,
                    category_name=None,
                    not_category_name=None,
                    **kwargs):
    '''
    Parameters
    ----------
    corpus : Corpus
        Corpus to use.
    category : str
        Name of category column as it appears in original data frame.
    category_name : str
        Name of category to use.  E.g., "5-star reviews."
    not_category_name : str
        Name of everything that isn't in category.  E.g., "Below 5-star reviews".
    scores : np.array
        Scores to display in visualization.  Zero scores are grey.

    Remaining arguments are from `produce_scattertext_explorer`.

    Returns
    -------
        str, html of visualization
    '''

    return produce_scattertext_explorer(
        corpus,
        category,
        category_name,
        not_category_name,
        scores=scores,
        sort_by_dist=False,
        gray_zero_scores=True,
        **kwargs
    )