How to use the composeml.data_slice.offset.DataSliceOffset function in composeml

def _check_parameters(self, size, start, step):
        """Checks if parameters are data slice offsets."""
        if not isinstance(size, DataSliceStep):
            size = DataSliceStep(size)

        start = start or self._df.index[0]
        if not isinstance(start, DataSliceOffset):
            start = DataSliceOffset(start)

        step = step or size
        if not isinstance(step, DataSliceStep):
            step = DataSliceStep(step)

        info = 'offset must be positive'
        assert size._is_positive, info
        assert step._is_positive, info

        if any(offset._is_offset_period for offset in (size, start, step)):
            info = 'offset by time requires a time index'
            assert self._is_time_index, info

        return size, start, step

def _check_parameters(self, size, start, step):
        """Checks if parameters are data slice offsets."""
        if not isinstance(size, DataSliceStep):
            size = DataSliceStep(size)

        start = start or self._df.index[0]
        if not isinstance(start, DataSliceOffset):
            start = DataSliceOffset(start)

        step = step or size
        if not isinstance(step, DataSliceStep):
            step = DataSliceStep(step)

        info = 'offset must be positive'
        assert size._is_positive, info
        assert step._is_positive, info

        if any(offset._is_offset_period for offset in (size, start, step)):
            info = 'offset by time requires a time index'
            assert self._is_time_index, info

        return size, start, step

for parser in self._parsers:
            try:
                value = parser(self.value)
                if value is not None:
                    self.value = value
                    break
            except Exception:
                continue

    @property
    def _parsers(self):
        """Returns the value parsers."""
        return pd.Timestamp, self._parse_offset_alias, pd.Timedelta


class DataSliceStep(DataSliceOffset):
    @property
    def _is_valid_offset(self):
        """Whether offset is a valid type."""
        value = self._is_offset_position
        value |= self._is_offset_period
        return value

    @property
    def _parsers(self):
        """Returns the value parsers."""
        return self._parse_offset_alias, pd.Timedelta