t3_from_tensor_train

t3toolbox.backend.t3_conversions.t3_from_tensor_train(tt_cores)

def t3_from_tensor_train(
        tt_cores: typ.Sequence[NDArray],  # len=d, elm_shape=stack_shape+(rLi,Ni,rR(i+1))
) -> typ.Tuple[
    typ.Tuple[NDArray, ...],  # tucker_cores. len=d, identity bases, elm_shape=stack_shape+(Ni,Ni)
    typ.Tuple[NDArray, ...],  # tt_cores.     len=d, elm_shape=stack_shape+(rLi,Ni,rR(i+1))
]:

Convert tensor train into Tucker tensor train by using identity matrices for Tucker bases.

Parameters:

tt_cores (t3toolbox.backend.common.typ.Sequence[NDArray])

Return type:

t3toolbox.backend.common.typ.Tuple[t3toolbox.backend.common.typ.Tuple[NDArray, Ellipsis], t3toolbox.backend.common.typ.Tuple[NDArray, Ellipsis]]