def seed(self, seed=None):
self.np_random, seed1 = seeding.np_random(seed)
# Derive a random seed. This gets passed as a uint, but gets
# checked as an int elsewhere, so we need to keep it below
# 2**31.
seed2 = seeding.hash_seed(seed1 + 1) % 2**31
# Empirically, we need to seed before loading the ROM.
self.ale.setInt(b'random_seed', seed2)
self.ale.loadROM(self.game_path)
if self.game_mode is not None:
modes = self.ale.getAvailableModes()
assert self.game_mode in modes, (
"Invalid game mode \"{}\" for game {}.\nAvailable modes are: {}"
).format(self.game_mode, self.game, modes)
self.ale.setMode(self.game_mode)
if self.game_difficulty is not None:
difficulties = self.ale.getAvailableDifficulties()
assert self.game_difficulty in difficulties, (
"Invalid game difficulty \"{}\" for game {}.\nAvailable difficulties are: {}"
).format(self.game_difficulty, self.game, difficulties)
self.ale.setDifficulty(self.game_difficulty)
return [seed1, seed2]
def seed(self, seed=None):
self.np_random, seed = seeding.np_random(seed)
return [seed]
def seed(self, seed=None):
"""Seed the PRNG of this space. """
self.np_random, seed = seeding.np_random(seed)
return [seed]