# How to calculate v min and v max for C51 DQN

Background: In C51 DQNs you must specify a v-min/max to be used during training. The way this is generally done is you take the max score possible for the game and set that to v-max, then v-min is just negative v-max. For a game like Pong deciding the v-min/max is simple because the max score possible is 20, therefore, v_min=-20 and v_max=20.

Question: In a game like Space Invaders, there is no max score, so how would I calculate the v-min/max for a C51 DQN?