Remove future imports (#6724)

* Remove all __future__ imports from RLlib.

* Remove (object) again from tf_run_builder.py::TFRunBuilder.

* Fix 2xLINT warnings.

* Fix broken appo_policy import (must be appo_tf_policy)

* Remove future imports from all other ray files (not just RLlib).

* Remove future imports from all other ray files (not just RLlib).

* Remove future import blocks that contain `unicode_literals` as well.
Revert appo_tf_policy.py to appo_policy.py (belongs to another PR).

* Add two empty lines before Schedule class.

* Put back __future__ imports into determine_tests_to_run.py. Fails otherwise on a py2/print related error.

ci/jenkins_tests/miscellaneous/large_memory_test.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 
 import ray

ci/jenkins_tests/miscellaneous/test_wait_hanging.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 
 

ci/long_running_tests/workloads/actor_deaths.py

@@ -1,9 +1,5 @@
 # This workload tests repeatedly killing actors and submitting tasks to them.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import sys
 import time

ci/long_running_tests/workloads/apex.py

@@ -1,9 +1,5 @@
 # This workload tests running APEX
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 from ray.cluster_utils import Cluster
 from ray.tune import run_experiments

ci/long_running_tests/workloads/impala.py

@@ -1,9 +1,5 @@
 # This workload tests running IMPALA with remote envs
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 from ray.tune import run_experiments
 from ray.cluster_utils import Cluster

ci/long_running_tests/workloads/many_actor_tasks.py

@@ -1,9 +1,5 @@
 # This workload tests submitting many actor methods.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import time
 
 import numpy as np

ci/long_running_tests/workloads/many_drivers.py

@@ -1,9 +1,5 @@
 # This workload tests many drivers using the same cluster.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import time
 
 import ray

ci/long_running_tests/workloads/many_tasks.py

@@ -1,9 +1,5 @@
 # This workload tests submitting and getting many tasks over and over.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import time
 
 import numpy as np

ci/long_running_tests/workloads/node_failures.py

@@ -1,9 +1,5 @@
 # This workload tests repeatedly killing a node and adding a new node.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import time
 
 import ray

ci/long_running_tests/workloads/pbt.py

@@ -1,9 +1,5 @@
 # This workload tests running PBT
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 from ray.tune import run_experiments
 from ray.tune.schedulers import PopulationBasedTraining

ci/performance_tests/test_performance.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import logging
 import numpy as np

ci/stress_tests/test_dead_actors.py

@@ -1,9 +1,5 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 import numpy as np
 import sys

ci/stress_tests/test_many_tasks.py

@@ -1,9 +1,5 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import logging
 import time

doc/examples/cython/cython_examples/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from .cython_simple import simple_func, fib, fib_int, \
         fib_cpdef, fib_cdef, simple_class
 from .masked_log import masked_log

doc/examples/cython/cython_main.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 import click
 import inspect

doc/examples/cython/setup.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 from setuptools import setup
 from Cython.Build import cythonize

doc/examples/lbfgs/driver.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import os
 import scipy.optimize

doc/examples/newsreader/server.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import atoma
 from flask import Flask, jsonify, request
 from flask_cors import CORS

doc/kubernetes/example.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from collections import Counter
 import os
 import sys

doc/yarn/example.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from collections import Counter
 import sys
 import time

java/modify_generated_java_flatbuffers_files.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import sys
 """

java/test/src/main/resources/test_cross_language_invocation.py

@@ -1,10 +1,6 @@
 # This file is used by CrossLanguageInvocationTest.java to test cross-language
 # invocation.
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import six
 
 import ray

python/ray/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 from os.path import dirname
 import sys

python/ray/actor.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import inspect
 import logging

python/ray/autoscaler/autoscaler.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import hashlib
 import json

python/ray/autoscaler/aws/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from distutils.version import StrictVersion
 import json
 import os

python/ray/autoscaler/aws/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import random
 import threading
 from collections import defaultdict

python/ray/autoscaler/commands.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import hashlib
 import json

python/ray/autoscaler/docker.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import logging
 try:  # py3

python/ray/autoscaler/gcp/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import logging
 import time

python/ray/autoscaler/gcp/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from uuid import uuid4
 from threading import RLock
 import time

python/ray/autoscaler/kubernetes/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import kubernetes
 from kubernetes.config.config_exception import ConfigException
 

python/ray/autoscaler/kubernetes/config.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 from kubernetes import client

python/ray/autoscaler/kubernetes/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 from ray.autoscaler.kubernetes import core_api, log_prefix

python/ray/autoscaler/local/config.py

@@ -1,7 +1,2 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
-
 def bootstrap_local(config):
     return config

python/ray/autoscaler/local/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from filelock import FileLock
 from threading import RLock
 import json

python/ray/autoscaler/log_timer.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import datetime
 import logging
 

python/ray/autoscaler/node_provider.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import importlib
 import logging
 import os

python/ray/autoscaler/tags.py

@@ -1,9 +1,5 @@
 """The Ray autoscaler uses tags/labels to associate metadata with instances."""
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 # Tag for the name of the node
 TAG_RAY_NODE_NAME = "ray-node-name"
 

python/ray/autoscaler/updater.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 try:  # py3
     from shlex import quote
 except ImportError:  # py2

python/ray/cluster_utils.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 import time
 

python/ray/dashboard/dashboard.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 try:
     import aiohttp.web
 except ImportError:

python/ray/experimental/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from .gcs_flush_policy import (set_flushing_policy, GcsFlushPolicy,
                                SimpleGcsFlushPolicy)
 from .named_actors import get_actor, register_actor

python/ray/experimental/actor_pool.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 
 

python/ray/experimental/api.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 import numpy as np
 

python/ray/experimental/array/distributed/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from . import random
 from . import linalg
 from .core import (BLOCK_SIZE, DistArray, assemble, zeros, ones, copy, eye,

python/ray/experimental/array/distributed/core.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray.experimental.array.remote as ra
 import ray

python/ray/experimental/array/distributed/linalg.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray.experimental.array.remote as ra
 import ray

python/ray/experimental/array/distributed/random.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray.experimental.array.remote as ra
 import ray

python/ray/experimental/array/remote/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from . import random
 from . import linalg
 from .core import (zeros, zeros_like, ones, eye, dot, vstack, hstack, subarray,

python/ray/experimental/array/remote/core.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray
 

python/ray/experimental/array/remote/linalg.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray
 

python/ray/experimental/array/remote/random.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import ray
 

python/ray/experimental/gcs_flush_policy.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import time
 

python/ray/experimental/internal_kv.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 
 _local = {}  # dict for local mode

python/ray/experimental/multiprocessing/pool.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from multiprocessing import TimeoutError
 import os
 import time

python/ray/experimental/named_actors.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 import ray.cloudpickle as pickle
 from ray.experimental.internal_kv import _internal_kv_get, _internal_kv_put

python/ray/experimental/no_return.py

@@ -1,8 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
-
 class NoReturn:
     """Do not store the return value in the object store.
 

python/ray/experimental/queue.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from collections import deque
 import time
 

python/ray/experimental/sgd/examples/cifar_pytorch_example.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import torch
 import torch.nn as nn

python/ray/experimental/sgd/examples/cifar_tf_example.py

@@ -4,10 +4,6 @@
 It gets to 75% validation accuracy in 25 epochs, and 79% after 50 epochs.
 (it"s still underfitting at that point, though).
 """
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 
 from tensorflow.keras.datasets import cifar10

python/ray/experimental/sgd/examples/tensorflow_train_example.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import tensorflow as tf
 from tensorflow.keras.models import Sequential

python/ray/experimental/sgd/examples/train_example.py

@@ -8,10 +8,6 @@ in the documentation.
 
 # yapf: disable
 # __torch_train_example__
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import numpy as np
 import torch

python/ray/experimental/sgd/examples/tune_example.py

@@ -8,10 +8,6 @@ in the documentation.
 """
 
 # __torch_tune_example__
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import torch
 import torch.nn as nn

python/ray/experimental/sgd/pytorch/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from ray.experimental.sgd.pytorch.pytorch_trainer import (PyTorchTrainer,
                                                           PyTorchTrainable)
 

python/ray/experimental/sgd/pytorch/distributed_pytorch_runner.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import collections
 from filelock import FileLock
 import logging

python/ray/experimental/sgd/pytorch/examples/dcgan.py

@@ -1,9 +1,5 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import os
 import torch

python/ray/experimental/sgd/pytorch/pytorch_runner.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import collections
 from filelock import FileLock
 import logging

python/ray/experimental/sgd/pytorch/pytorch_trainer.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import os
 import torch

python/ray/experimental/sgd/pytorch/utils.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import collections
 import time
 import torch

python/ray/experimental/sgd/tests/test_pytorch.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import pytest
 import tempfile

python/ray/experimental/sgd/tests/test_pytorch_runner.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import torch
 import torch.nn as nn

python/ray/experimental/sgd/tests/test_tensorflow.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import os
 import pytest
 import tempfile

python/ray/experimental/sgd/tf/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from ray.experimental.sgd.tf.tf_trainer import (TFTrainer, TFTrainable)
 
 __all__ = ["TFTrainer", "TFTrainable"]

python/ray/experimental/sgd/tf/tf_runner.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 import json
 import os

python/ray/experimental/sgd/tf/tf_trainer.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import numpy as np
 import os
 import logging

python/ray/experimental/sgd/utils.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from contextlib import closing
 import numpy as np
 import socket

python/ray/experimental/signal.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 from collections import defaultdict

python/ray/experimental/test/async_test.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import asyncio
 import time
 

python/ray/experimental/tf_utils.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from collections import deque, OrderedDict
 import numpy as np
 

python/ray/function_manager.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import dis
 import hashlib
 import importlib

python/ray/gcs_utils.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from ray.core.generated.gcs_pb2 import (
     ActorCheckpointIdData,
     ActorTableData,

python/ray/import_thread.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from collections import defaultdict
 import threading
 import traceback

python/ray/internal/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from ray.internal.internal_api import free
 
 __all__ = ["free"]

python/ray/internal/internal_api.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray.worker
 from ray import profiling
 

python/ray/local_mode_manager.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import copy
 import traceback
 

python/ray/log_monitor.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import errno
 import glob

python/ray/memory_monitor.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 import os
 import sys

python/ray/monitor.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import logging
 import os

python/ray/node.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import atexit
 import collections
 import datetime

python/ray/parameter.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 
 import numpy as np

python/ray/profiling.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray
 
 

python/ray/projects/__init__.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 from ray.projects.projects import ProjectDefinition
 
 __all__ = [

python/ray/projects/projects.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import copy
 import json

python/ray/projects/scripts.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import click
 import copy
 import jsonschema

python/ray/ray_constants.py

@@ -1,6 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
 """Ray constants used in the Python code."""
 
 import logging

python/ray/remote_function.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import logging
 from functools import wraps
 

python/ray/reporter.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import argparse
 import logging
 import json

python/ray/resource_spec.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import math
 from collections import namedtuple
 import logging

python/ray/runtime_context.py

@@ -1,7 +1,3 @@
-from __future__ import absolute_import
-from __future__ import division
-from __future__ import print_function
-
 import ray.worker