在Azure App服务中使用xgboost时使用部署时出错

Question

我正在部署一个烧瓶网络应用程序，其机器学习模型使用xgboost进行培训。在本地工作正常，在使用Azure App服务linux机器时出错。

它似乎没有正确安装xgboost。我无法使用他们的Web SSH进行故障排除，因为它每隔几秒就会断开连接。任何人都知道如何解决它？

错误：

2019-04-05T20:46:57.927633884Z /home/site/wwwroot/antenv/lib/python3.7/site-packages/sklearn/externals/joblib/externals/cloudpickle/cloudpickle.py:47: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
2019-04-05T20:46:57.927671786Z   import imp
2019-04-05T20:46:57.927678286Z [2019-04-05 20:46:57 +0000] [39] [ERROR] Exception in worker process
2019-04-05T20:46:57.927682786Z Traceback (most recent call last):
2019-04-05T20:46:57.927686887Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-04-05T20:46:57.927691387Z     worker.init_process()
2019-04-05T20:46:57.927695487Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-04-05T20:46:57.927700087Z     self.load_wsgi()
2019-04-05T20:46:57.927703987Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-04-05T20:46:57.927715888Z     self.wsgi = self.app.wsgi()
2019-04-05T20:46:57.927720188Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-04-05T20:46:57.927724388Z     self.callable = self.load()
2019-04-05T20:46:57.927728188Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-04-05T20:46:57.927732288Z     return self.load_wsgiapp()
2019-04-05T20:46:57.927736189Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-04-05T20:46:57.927740389Z     return util.import_app(self.app_uri)
2019-04-05T20:46:57.927744389Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/gunicorn/util.py", line 350, in import_app
2019-04-05T20:46:57.927748389Z     __import__(module)
2019-04-05T20:46:57.927752289Z   File "/home/site/wwwroot/app.py", line 4, in 
2019-04-05T20:46:57.927756789Z     import xgboost as xgb
2019-04-05T20:46:57.927760690Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/xgboost/__init__.py", line 11, in 
2019-04-05T20:46:57.927764990Z     from .core import DMatrix, Booster
2019-04-05T20:46:57.927768990Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/xgboost/core.py", line 136, in 
2019-04-05T20:46:57.927773190Z     _LIB = _load_lib()
2019-04-05T20:46:57.927776990Z   File "/home/site/wwwroot/antenv/lib/python3.7/site-packages/xgboost/core.py", line 128, in _load_lib
2019-04-05T20:46:57.927781090Z     lib.XGBGetLastError.restype = ctypes.c_char_p
2019-04-05T20:46:57.927784991Z UnboundLocalError: local variable 'lib' referenced before assignment

Answer 1

看起来好像没有加载xgboost模块。我建议你在启动时导入mpodule。在Docker中，您可以通过在docker文件中指定安装步骤来完成此操作。

您可以使用基于alpine的docker image的dockerfile中的步骤：https://github.com/Nexosis/alpine-xgboost/blob/master/Dockerfile

顺便说一句，我通过Github线程的讨论找到了这个：https://github.com/dmlc/xgboost/issues/3157

更多信息：执行此操作的一种方法是从此处分叉Azure App Service中使用的官方Python映像的副本：https://hub.docker.com/r/appsvc/python

完成此操作后，您可以编辑仓库中的dockerfile，并包含上面发布的解决方案中的步骤以构建您自己的docker镜像。这将确保您已加载所有模块。