Get the list of inputs in the `col` of `path/csv_name`.

def from_df(cls, df:DataFrame, cat_names:OptStrList=None, cont_names:OptStrList=None, procs=None, **kwargs)->'ItemList':
        "Get the list of inputs in the `col` of `path/csv_name`."
        return cls(items=range(len(df)), cat_names=cat_names, cont_names=cont_names, procs=procs, inner_df=df.copy(), **kwargs)