Observe the performance of self-organizing map for travelling salesman problem for the following conditions:

• Number of cities = 100 and number of neurons in the output layer = 2000
• Number of cities = 100 and number of neurons in the output layer = 50
• In each case, compute the number of cities that have not been visited even once.
• Plot the percentage of cities visited, as a function of the number of iterations in either cases.