prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  import error
  ray 0.8.5,when I try to use ray， it occurs  Ray must be imported before pickle5 because Ray requires a specific version of pickle5 (which is packaged along with Ray.
  
  I want to know it must import  pickle5 before import ray,  Right?
  
  </issue>
  <code>
  [start of python/ray/__init__.py]
  1 import os
  2 import logging
  3 from os.path import dirname
  4 import sys
  5 
  6 logger = logging.getLogger(__name__)
  7 
  8 # MUST add pickle5 to the import path because it will be imported by some
  9 # raylet modules.
  10 
  11 if "pickle5" in sys.modules:
  12     raise ImportError("Ray must be imported before pickle5 because Ray "
  13                       "requires a specific version of pickle5 (which is "
  14                       "packaged along with Ray).")
  15 
  16 if "OMP_NUM_THREADS" not in os.environ:
  17     logger.debug("[ray] Forcing OMP_NUM_THREADS=1 to avoid performance "
  18                  "degradation with many workers (issue #6998). You can "
  19                  "override this by explicitly setting OMP_NUM_THREADS.")
  20     os.environ["OMP_NUM_THREADS"] = "1"
  21 
  22 # Add the directory containing pickle5 to the Python path so that we find the
  23 # pickle5 version packaged with ray and not a pre-existing pickle5.
  24 pickle5_path = os.path.join(
  25     os.path.abspath(os.path.dirname(__file__)), "pickle5_files")
  26 sys.path.insert(0, pickle5_path)
  27 
  28 # Importing psutil & setproctitle. Must be before ray._raylet is initialized.
  29 thirdparty_files = os.path.join(
  30     os.path.abspath(os.path.dirname(__file__)), "thirdparty_files")
  31 sys.path.insert(0, thirdparty_files)
  32 
  33 if sys.platform == "win32":
  34     import ray.compat  # noqa: E402
  35     ray.compat.patch_redis_empty_recv()
  36 
  37 # Expose ray ABI symbols which may be dependent by other shared
  38 # libraries such as _streaming.so. See BUILD.bazel:_raylet
  39 python_shared_lib_suffix = ".so" if sys.platform != "win32" else ".pyd"
  40 so_path = os.path.join(dirname(__file__), "_raylet" + python_shared_lib_suffix)
  41 if os.path.exists(so_path):
  42     import ctypes
  43     from ctypes import CDLL
  44     CDLL(so_path, ctypes.RTLD_GLOBAL)
  45 
  46 import ray._raylet  # noqa: E402
  47 
  48 from ray._raylet import (
  49     ActorCheckpointID,
  50     ActorClassID,
  51     ActorID,
  52     ClientID,
  53     Config as _Config,
  54     JobID,
  55     WorkerID,
  56     FunctionID,
  57     ObjectID,
  58     TaskID,
  59     UniqueID,
  60     Language,
  61 )  # noqa: E402
  62 
  63 _config = _Config()
  64 
  65 from ray.profiling import profile  # noqa: E402
  66 from ray.state import (jobs, nodes, actors, objects, timeline,
  67                        object_transfer_timeline, cluster_resources,
  68                        available_resources, errors)  # noqa: E402
  69 from ray.worker import (
  70     LOCAL_MODE,
  71     SCRIPT_MODE,
  72     WORKER_MODE,
  73     cancel,
  74     connect,
  75     disconnect,
  76     get,
  77     get_gpu_ids,
  78     get_resource_ids,
  79     get_webui_url,
  80     init,
  81     is_initialized,
  82     put,
  83     kill,
  84     register_custom_serializer,
  85     remote,
  86     shutdown,
  87     show_in_webui,
  88     wait,
  89 )  # noqa: E402
  90 import ray.internal  # noqa: E402
  91 import ray.projects  # noqa: E402
  92 # We import ray.actor because some code is run in actor.py which initializes
  93 # some functions in the worker.
  94 import ray.actor  # noqa: F401
  95 from ray.actor import method  # noqa: E402
  96 from ray.cross_language import java_function, java_actor_class  # noqa: E402
  97 from ray import util  # noqa: E402
  98 
  99 # Replaced with the current commit when building the wheels.
  100 __commit__ = "{{RAY_COMMIT_SHA}}"
  101 __version__ = "0.9.0.dev0"
  102 
  103 __all__ = [
  104     "jobs",
  105     "nodes",
  106     "actors",
  107     "objects",
  108     "timeline",
  109     "object_transfer_timeline",
  110     "cluster_resources",
  111     "available_resources",
  112     "errors",
  113     "LOCAL_MODE",
  114     "PYTHON_MODE",
  115     "SCRIPT_MODE",
  116     "WORKER_MODE",
  117     "__version__",
  118     "_config",
  119     "_get_runtime_context",
  120     "actor",
  121     "cancel",
  122     "connect",
  123     "disconnect",
  124     "get",
  125     "get_gpu_ids",
  126     "get_resource_ids",
  127     "get_webui_url",
  128     "init",
  129     "internal",
  130     "is_initialized",
  131     "method",
  132     "profile",
  133     "projects",
  134     "put",
  135     "kill",
  136     "register_custom_serializer",
  137     "remote",
  138     "shutdown",
  139     "show_in_webui",
  140     "wait",
  141     "Language",
  142     "java_function",
  143     "java_actor_class",
  144     "util",
  145 ]
  146 
  147 # ID types
  148 __all__ += [
  149     "ActorCheckpointID",
  150     "ActorClassID",
  151     "ActorID",
  152     "ClientID",
  153     "JobID",
  154     "WorkerID",
  155     "FunctionID",
  156     "ObjectID",
  157     "TaskID",
  158     "UniqueID",
  159 ]
  160
  [end of python/ray/__init__.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/python/ray/__init__.py b/python/ray/__init__.py
  --- a/python/ray/__init__.py
  +++ b/python/ray/__init__.py
  @@ -9,9 +9,13 @@
   # raylet modules.
   
   if "pickle5" in sys.modules:
  -    raise ImportError("Ray must be imported before pickle5 because Ray "
  -                      "requires a specific version of pickle5 (which is "
  -                      "packaged along with Ray).")
  +    import pkg_resources
  +    version_info = pkg_resources.require("pickle5")
  +    version = tuple(int(n) for n in version_info[0].version.split("."))
  +    if version < (0, 0, 10):
  +        raise ImportError("You are using an old version of pickle5 that "
  +                          "leaks memory, please run 'pip install pickle5 -U' "
  +                          "to upgrade")
   
   if "OMP_NUM_THREADS" not in os.environ:
       logger.debug("[ray] Forcing OMP_NUM_THREADS=1 to avoid performance "
  
verification_info: {"golden_diff": "diff --git a/python/ray/__init__.py b/python/ray/__init__.py\n--- a/python/ray/__init__.py\n+++ b/python/ray/__init__.py\n@@ -9,9 +9,13 @@\n # raylet modules.\n \n if \"pickle5\" in sys.modules:\n-    raise ImportError(\"Ray must be imported before pickle5 because Ray \"\n-                      \"requires a specific version of pickle5 (which is \"\n-                      \"packaged along with Ray).\")\n+    import pkg_resources\n+    version_info = pkg_resources.require(\"pickle5\")\n+    version = tuple(int(n) for n in version_info[0].version.split(\".\"))\n+    if version < (0, 0, 10):\n+        raise ImportError(\"You are using an old version of pickle5 that \"\n+                          \"leaks memory, please run 'pip install pickle5 -U' \"\n+                          \"to upgrade\")\n \n if \"OMP_NUM_THREADS\" not in os.environ:\n     logger.debug(\"[ray] Forcing OMP_NUM_THREADS=1 to avoid performance \"\n", "issue": "import error\nray 0.8.5,when I try to use ray\uff0c it occurs  Ray must be imported before pickle5 because Ray requires a specific version of pickle5 (which is packaged along with Ray.\r\n\r\nI want to know it must import  pickle5 before import ray,  Right?\n", "before_files": [{"content": "import os\nimport logging\nfrom os.path import dirname\nimport sys\n\nlogger = logging.getLogger(__name__)\n\n# MUST add pickle5 to the import path because it will be imported by some\n# raylet modules.\n\nif \"pickle5\" in sys.modules:\n    raise ImportError(\"Ray must be imported before pickle5 because Ray \"\n                      \"requires a specific version of pickle5 (which is \"\n                      \"packaged along with Ray).\")\n\nif \"OMP_NUM_THREADS\" not in os.environ:\n    logger.debug(\"[ray] Forcing OMP_NUM_THREADS=1 to avoid performance \"\n                 \"degradation with many workers (issue #6998). You can \"\n                 \"override this by explicitly setting OMP_NUM_THREADS.\")\n    os.environ[\"OMP_NUM_THREADS\"] = \"1\"\n\n# Add the directory containing pickle5 to the Python path so that we find the\n# pickle5 version packaged with ray and not a pre-existing pickle5.\npickle5_path = os.path.join(\n    os.path.abspath(os.path.dirname(__file__)), \"pickle5_files\")\nsys.path.insert(0, pickle5_path)\n\n# Importing psutil & setproctitle. Must be before ray._raylet is initialized.\nthirdparty_files = os.path.join(\n    os.path.abspath(os.path.dirname(__file__)), \"thirdparty_files\")\nsys.path.insert(0, thirdparty_files)\n\nif sys.platform == \"win32\":\n    import ray.compat  # noqa: E402\n    ray.compat.patch_redis_empty_recv()\n\n# Expose ray ABI symbols which may be dependent by other shared\n# libraries such as _streaming.so. See BUILD.bazel:_raylet\npython_shared_lib_suffix = \".so\" if sys.platform != \"win32\" else \".pyd\"\nso_path = os.path.join(dirname(__file__), \"_raylet\" + python_shared_lib_suffix)\nif os.path.exists(so_path):\n    import ctypes\n    from ctypes import CDLL\n    CDLL(so_path, ctypes.RTLD_GLOBAL)\n\nimport ray._raylet  # noqa: E402\n\nfrom ray._raylet import (\n    ActorCheckpointID,\n    ActorClassID,\n    ActorID,\n    ClientID,\n    Config as _Config,\n    JobID,\n    WorkerID,\n    FunctionID,\n    ObjectID,\n    TaskID,\n    UniqueID,\n    Language,\n)  # noqa: E402\n\n_config = _Config()\n\nfrom ray.profiling import profile  # noqa: E402\nfrom ray.state import (jobs, nodes, actors, objects, timeline,\n                       object_transfer_timeline, cluster_resources,\n                       available_resources, errors)  # noqa: E402\nfrom ray.worker import (\n    LOCAL_MODE,\n    SCRIPT_MODE,\n    WORKER_MODE,\n    cancel,\n    connect,\n    disconnect,\n    get,\n    get_gpu_ids,\n    get_resource_ids,\n    get_webui_url,\n    init,\n    is_initialized,\n    put,\n    kill,\n    register_custom_serializer,\n    remote,\n    shutdown,\n    show_in_webui,\n    wait,\n)  # noqa: E402\nimport ray.internal  # noqa: E402\nimport ray.projects  # noqa: E402\n# We import ray.actor because some code is run in actor.py which initializes\n# some functions in the worker.\nimport ray.actor  # noqa: F401\nfrom ray.actor import method  # noqa: E402\nfrom ray.cross_language import java_function, java_actor_class  # noqa: E402\nfrom ray import util  # noqa: E402\n\n# Replaced with the current commit when building the wheels.\n__commit__ = \"{{RAY_COMMIT_SHA}}\"\n__version__ = \"0.9.0.dev0\"\n\n__all__ = [\n    \"jobs\",\n    \"nodes\",\n    \"actors\",\n    \"objects\",\n    \"timeline\",\n    \"object_transfer_timeline\",\n    \"cluster_resources\",\n    \"available_resources\",\n    \"errors\",\n    \"LOCAL_MODE\",\n    \"PYTHON_MODE\",\n    \"SCRIPT_MODE\",\n    \"WORKER_MODE\",\n    \"__version__\",\n    \"_config\",\n    \"_get_runtime_context\",\n    \"actor\",\n    \"cancel\",\n    \"connect\",\n    \"disconnect\",\n    \"get\",\n    \"get_gpu_ids\",\n    \"get_resource_ids\",\n    \"get_webui_url\",\n    \"init\",\n    \"internal\",\n    \"is_initialized\",\n    \"method\",\n    \"profile\",\n    \"projects\",\n    \"put\",\n    \"kill\",\n    \"register_custom_serializer\",\n    \"remote\",\n    \"shutdown\",\n    \"show_in_webui\",\n    \"wait\",\n    \"Language\",\n    \"java_function\",\n    \"java_actor_class\",\n    \"util\",\n]\n\n# ID types\n__all__ += [\n    \"ActorCheckpointID\",\n    \"ActorClassID\",\n    \"ActorID\",\n    \"ClientID\",\n    \"JobID\",\n    \"WorkerID\",\n    \"FunctionID\",\n    \"ObjectID\",\n    \"TaskID\",\n    \"UniqueID\",\n]\n", "path": "python/ray/__init__.py"}]}