Should I ignore the actions RIGHTFIRE and LEFTFIRE in the SpaceInvaders environment? I'm trying to replicate the DeepMind DQN paper. I'm using OpenAI's Gym. I'm trying to get a decent score with Space Invaders (using SpaceInvaders-v4 environment). I checked the actions available with env.unwrapped.get_action_meanings(), and I get this:
['NOOP', 'FIRE', 'RIGHT', 'LEFT', 'RIGHTFIRE', 'LEFTFIRE']

Checking the number of actions with env.action_space.n gives me a number of 6 actions.
The RIGHTFIRE and LEFTFIRE actions, I suppose, aren't used, given that they seem to do the same as LEFT and RIGHT, am I right?
If so, restricting the action size to the 4 first actions would improve my learning?
I found that we shouldn't eliminate those actions, because RIGHTFIRE and LEFTFIRE do RIGHT + FIRE and LEFT + FIRE, respectively. So they are different actions. I post this just to clarify in case someone faces the same doubt.