If you are strictly looking for "7.83" because you want the Dota 2 7.33/7.32 mechanics (like the Twin Gates, Universal heroes, or the new map geometry):
For players in regions with poor internet in the early 2010s, the AI map was a sanctuary. You could practice last-hitting under pressure without worrying about a player disconnecting 10 minutes into the game. dota map 783 ai
The AI attempts Roshan at roughly 25:00. Ward the pit. When the bots are inside, heroes with AoE disables (Tidehunter, Magnus) can get a guaranteed team wipe because the AI refuses to leave the pit until Roshan is dead. If you are strictly looking for "7