SharedGeometry.frame

t3toolbox.shared_geometry.SharedGeometry.frame(x)

def frame(self, x):

The base geometry’s frame at x (ragged TuckerTensorTrain -> T3Frame; uniform UniformTuckerTensorTrain -> UT3Frame).

An untied ``x`` is tied first, silently, by the per-group mean (t3_tie_tucker_factors() / its uniform twin) – the frame of a shared geometry describes a point on the shared set, so entering the format is this method’s job rather than the caller’s. An already-tied point is a bitwise fixed point, so the ordinary path is unchanged. This is what makes an untied initial guess a non-event for the frontend optimizers (which build their frames through this wrapper), and it also absorbs the slow drift a long run of low-precision first-order steps can produce.