Threshold function(阈值函数) First there is the Threshold 1in20 Function which takes on a 0if<0 value of o if the summed input is less than a certain threshold value(v), and the value l if the summed input is greater than or equal to the threshold value First, there is the Threshold Function which takes on a value of 0 if the summed input is less than a certain threshold value (v), and the value 1 if the summed input is greater than or equal to the threshold value