Figure 4.

(a) The data path for calculating score $(\overrightarrow{\mathsf{\text{y}}}=\overrightarrow{\mathsf{\text{W}}}\overrightarrow{\mathsf{\text{x}}})$ and the lower triangular matrix $\overrightarrow{\mathsf{\text{y}}}{\overrightarrow{\mathsf{\text{y}}}}^{\mathsf{\text{T}}}$. (b) The data path for updating synaptic weights, ${\overrightarrow{\mathsf{\text{W}}}}_{\mathsf{\text{i}}}$.