def fit(approach, train_dict):
    """
    Given a train data (features and labels), fit a dummy classifier.
    Since we can actually not fit a model, it returns the probability of complaint.

    Parameters
    ----------
    approach: dictionary
        Approach configuration coming from the experiment yaml
    train_dict: dictionary
        Dictionary containing the train features DataFrame and the train labels DataFrame.

    Return
    ------
    Class
        Model fitted using the train data.
    """

    model = approach['hyperparameters']['perc_complaint']
    return model