When you are training with a colleague who has a bad temper, how can you deal with him?

proper counselling and getting his insight of such person is required . later on hopefully he can be cool 

You give him clear instructions on what is acceptable and what not. Three strikes and he is out. Temper is so deep rooted that it is hard to change, but it needs to be CONTROLLED. If your colleague has no self control he should be given a chance. Two chances. But then he can act on his temper and lose control on his own free time, not yours and not your company's.