Move legacy Atari environments -> ale-py

docs/environments.md

@@ -28,7 +28,6 @@ and are namespaced with `ALE`. For example, the `v5` environments can be include
 
 ```python
 import gym
-import ale_py
 
 env = gym.make('ALE/SpaceInvaders-v5')
 ```

gym/envs/__init__.py

@@ -620,167 +620,6 @@ def _merge(a, b):
         max_episode_steps=100,
     )
 
-# Atari
-# ----------------------------------------
-
-for game in [
-    "adventure",
-    "air_raid",
-    "alien",
-    "amidar",
-    "assault",
-    "asterix",
-    "asteroids",
-    "atlantis",
-    "bank_heist",
-    "battle_zone",
-    "beam_rider",
-    "berzerk",
-    "bowling",
-    "boxing",
-    "breakout",
-    "carnival",
-    "centipede",
-    "chopper_command",
-    "crazy_climber",
-    "defender",
-    "demon_attack",
-    "double_dunk",
-    "elevator_action",
-    "enduro",
-    "fishing_derby",
-    "freeway",
-    "frostbite",
-    "gopher",
-    "gravitar",
-    "hero",
-    "ice_hockey",
-    "jamesbond",
-    "journey_escape",
-    "kangaroo",
-    "krull",
-    "kung_fu_master",
-    "montezuma_revenge",
-    "ms_pacman",
-    "name_this_game",
-    "phoenix",
-    "pitfall",
-    "pong",
-    "pooyan",
-    "private_eye",
-    "qbert",
-    "riverraid",
-    "road_runner",
-    "robotank",
-    "seaquest",
-    "skiing",
-    "solaris",
-    "space_invaders",
-    "star_gunner",
-    "tennis",
-    "time_pilot",
-    "tutankham",
-    "up_n_down",
-    "venture",
-    "video_pinball",
-    "wizard_of_wor",
-    "yars_revenge",
-    "zaxxon",
-]:
-    for obs_type in ["rgb", "ram"]:
-        # space_invaders should yield SpaceInvaders-v0 and SpaceInvaders-ram-v0
-        name = "".join([g.capitalize() for g in game.split("_")])
-        if obs_type == "ram":
-            name = "{}-ram".format(name)
-
-        nondeterministic = False
-        if game == "elevator_action" and obs_type == "ram":
-            # ElevatorAction-ram-v0 seems to yield slightly
-            # non-deterministic observations about 10% of the time. We
-            # should track this down eventually, but for now we just
-            # mark it as nondeterministic.
-            nondeterministic = True
-
-        default_kwargs = {
-            "game": game,
-            "obs_type": obs_type,
-            "repeat_action_probability": 0.0,
-            "full_action_space": False,
-            "frameskip": (2, 5),
-        }
-
-        register(
-            id="{}-v0".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={
-                **default_kwargs,
-                "repeat_action_probability": 0.25,
-            },
-            max_episode_steps=10000,
-            nondeterministic=nondeterministic,
-        )
-
-        register(
-            id="{}-v4".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={**default_kwargs},
-            max_episode_steps=100000,
-            nondeterministic=nondeterministic,
-        )
-
-        # Standard Deterministic (as in the original DeepMind paper)
-        if game == "space_invaders":
-            frameskip = 3
-        else:
-            frameskip = 4
-
-        # Use a deterministic frame skip.
-        register(
-            id="{}Deterministic-v0".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={
-                **default_kwargs,
-                "frameskip": frameskip,
-                "repeat_action_probability": 0.25,
-            },
-            max_episode_steps=100000,
-            nondeterministic=nondeterministic,
-        )
-
-        register(
-            id="{}Deterministic-v4".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={**default_kwargs, "frameskip": frameskip},
-            max_episode_steps=100000,
-            nondeterministic=nondeterministic,
-        )
-
-        register(
-            id="{}NoFrameskip-v0".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={
-                **default_kwargs,
-                "frameskip": 1,
-                "repeat_action_probability": 0.25,
-            },  # A frameskip of 1 means we get every frame
-            max_episode_steps=frameskip * 100000,
-            nondeterministic=nondeterministic,
-        )
-
-        # No frameskip. (Atari has no entropy source, so these are
-        # deterministic environments.)
-        register(
-            id="{}NoFrameskip-v4".format(name),
-            entry_point="ale_py.gym:ALGymEnv",
-            kwargs={
-                **default_kwargs,
-                "frameskip": 1,
-            },  # A frameskip of 1 means we get every frame
-            max_episode_steps=frameskip * 100000,
-            nondeterministic=nondeterministic,
-        )
-
-
 # Unit test
 # ---------
 

gym/envs/tests/spec_list.py

@@ -26,9 +26,9 @@ def should_skip_env_spec_for_tests(spec):
     ):
         return True
     try:
-        import ale_py
+        import gym.envs.atari
     except ImportError:
-        if ep.startswith("ale_py.gym"):
+        if ep.startswith("gym.envs.atari"):
             return True
     try:
         import Box2D
@@ -40,7 +40,7 @@ def should_skip_env_spec_for_tests(spec):
         "GoEnv" in ep
         or "HexEnv" in ep
         or (
-            ep.startswith("ale_py.gym")
+            ep.startswith("gym.envs.atari")
             and not spec.id.startswith("Pong")
             and not spec.id.startswith("Seaquest")
         )

gym/envs/tests/test_atari_env_specs.py → gym/envs/tests/test_atari_legacy_env_specs.py

@@ -1,3 +1,7 @@
+import pytest
+
+pytest.importorskip("gym.envs.atari")
+
 from gym.envs.registration import registry
 
 from itertools import product

gym/wrappers/test_atari_preprocessing.py

@@ -3,7 +3,7 @@
 from gym.wrappers import AtariPreprocessing
 import pytest
 
-pytest.importorskip("ale_py")
+pytest.importorskip("gym.envs.atari")
 
 
 @pytest.fixture(scope="module")

gym/wrappers/test_frame_stack.py

@@ -1,6 +1,6 @@
 import pytest
 
-pytest.importorskip("ale_py")
+pytest.importorskip("gym.envs.atari")
 
 import numpy as np
 import gym

gym/wrappers/test_gray_scale_observation.py

@@ -6,7 +6,7 @@
 from gym.wrappers import GrayScaleObservation
 from gym.wrappers import AtariPreprocessing
 
-pytest.importorskip("ale_py")
+pytest.importorskip("gym.envs.atari")
 pytest.importorskip("cv2")
 
 

gym/wrappers/test_resize_observation.py

@@ -3,15 +3,9 @@
 import gym
 from gym.wrappers import ResizeObservation
 
-try:
-    import ale_py
-except ImportError:
-    ale_py = None
+pytest.importorskip("gym.envs.atari")
 
 
-@pytest.mark.skipif(
-    ale_py is None, reason="Only run this test when ale_py is installed"
-)
 @pytest.mark.parametrize(
     "env_id", ["PongNoFrameskip-v0", "SpaceInvadersNoFrameskip-v0"]
 )