'Produce an iterator rolling windows rows over our data.
Each emitted window will have `window_length` rows.
Parameters
window_length : int
The number of rows in each emitted window.
offset : int, optional
Number of rows to skip before the first window.  Default is 0.
perspective_offset : int, optional
Number of rows past the end of the current window from which to
"view" the underlying data.'

def traverse(self, window_length, offset=0, perspective_offset=0):

    data = self._data.copy()
    _check_window_params(data, window_length)
    return self._iterator_type(data, self._view_kwargs, self.adjustments, offset, window_length, perspective_offset, rounding_places=None)
