Returns the sizes of `fluents` following the given `ordering`.

        Returns:
            Sequence[Sequence[int]]: A tuple of tuple of integers
            representing the shape and size of each fluent.

def _fluent_size(self, fluents, ordering) -> Sequence[Sequence[int]]:
        '''Returns the sizes of `fluents` following the given `ordering`.

        Returns:
            Sequence[Sequence[int]]: A tuple of tuple of integers
            representing the shape and size of each fluent.
        '''
        shapes = []
        for name in ordering:
            fluent = fluents[name]
            shape = self._param_types_to_shape(fluent.param_types)
            shapes.append(shape)
        return tuple(shapes)