Algorithm 1. A pseudocode for the construction of the inter-phase and intra-phase SOM.
1	Generate a random weight vector $w_x$ for each node $x$ in the 3x3 SOM.
2	Select a random feature vector as the input vector $x\text{'}$.
3	Calculate the Euclidean distance between the input vector and the weight vector.
4	Identify the node with the smallest Euclidean distance as the BMU.
5	Update the weight vector $w_{x\text{'}}$ according to (1).
6	Repeat Steps 2–5 until the maximum number of iterations is met or until the grid shrinks (i.e., the weights converge to local minima).