The tensor rank problem over the quaternions

We provide a nontrivial bound on the rank of any tensor $T$ over quaternions $\mathbb{H}$ in $n_1\times n_2\times n_3$ cases where $2\leq n_i\leq 3$. describe decomposition into $3$ simple tensors $2\times 2\times 2$ case. also show that upper is best possible for some cases, and we various partial results involving decompositions $\mathbb{C}$ $\mathbb{H}$.