Neural Networks with Keras Cookbook

How to do it...

The strategy that we discussed earlier is coded as follows:

1. Download the ROM that contains the Space Invaders game and also install the retro package:

$ wget http://www.atarimania.com/roms/Roms.rar && unrar x Roms.rar && unzip Roms/ROMS.zip$ pip3 install gym-retro$ python3 -m retro.import ROMS/

2. Create the environment and extract the observation space:

env=retro.make(game='SpaceInvaders-Atari2600')env.observation_space# Box(210,160,3)

3. Build a function that preprocesses the frame (image/screenshot of the Space Invaders game):

def preprocess_frame(frame):     # Greyscale frame      gray = rgb2gray(frame)     # Crop the screen (remove the part below the player)     # [Up: Down, Left: right]     cropped_frame = gray[8:-12,4:-12] # Normalize ...