Checks if numeric feature columns exist in ndarray

def has_ndarray_int_columns(features, X):
    """ Checks if numeric feature columns exist in ndarray """
    _, ncols = X.shape
    if not all(d.isdigit() for d in features if isinstance(d, str)) or not isinstance(X, np.ndarray):
        return False
    ndarray_columns = np.arange(0, ncols)
    feature_cols = np.unique([int(d) for d in features])
    return all(np.in1d(feature_cols, ndarray_columns))