Global minimumIt refers to the smallest one among all points. The relative concept is local minimum. If the error function has only one local minimum, then the local minimum at this time is the global minimum. If the error function has multiple local minima, it cannot be guaranteed that the solution found is the global minimum.

Finding the global minimum

• Find multiple local minima and take the minimum value;
• Use "simulated annealing" technology;
• Use stochastic gradient descent.