T3Frame.is_consistent
=====================

.. py:method:: t3toolbox.frame_variations_format.T3Frame.is_consistent(rtol = 1e-09)

   .. code-block:: python

      def is_consistent(self, rtol: float = 1e-9) -> NDArray:  # bool array, shape = stack_shape (scalar unstacked)


   ``True`` (per stack element) if the left- and right-canonical reconstructions of the base point agree.

   A frame stores both the left- and right-orthogonal core-TTs (see :py:meth:`to_t3`); for a
   **consistent** frame they reconstruct the same base point. This checks
   ``||left - right|| <= rtol * ||right||`` in the dense Frobenius norm.

   EXPENSIVE -- densifies both reconstructions. Deliberately **not** part of :py:meth:`validate`
   (which is structural and cheap). For a frame from :py:func:`t3_orthogonal_representations` (or
   :py:meth:`from_t3`/:py:meth:`orthogonalize`) consistency holds by construction; this is for
   sanity-checking hand-built bases.