pymc3 不工作，使用 Anaconda3 出现 nan 和 none 类型错误

Question

编辑：在下面的答案中找到了解决方案。把问题留给可能有同样问题的其他人。

我刚刚安装了 pymc3，它只 'partially' 对我有用。我在 windows 的 64 位安装上使用 Anaconda，但我认为这不是问题所在（即，我认为问题不是需要切换到 32 位 anaconda）。

各种例子都不适合我，所以我试着完成这个例子： http://docs.pymc.io/notebooks/getting_started.html#A-Motivating-Example:-Linear-Regression

一切正常，直到：

   with basic_model:
       # draw 500 posterior samples
       trace = pm.sample(500)

那时，我收到一个错误。编辑：我确实有理由相信它是 loky，因为我通过重新安装 theanos 和其他东西得到了进一步的发展。但我仍然得到这个：

C:\Users\Yurik\Anaconda3\lib\site-packages\h5py\__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
  from ._conv import register_converters as _register_converters
Running on PyMC3 v3.4.1
WARNING (theano.gof.compilelock): Overriding existing lock by dead process '26576' (I am process '27640')
Auto-assigning NUTS sampler...
Initializing NUTS using jitter+adapt_diag...
Multiprocess sampling (2 chains in 2 jobs)
NUTS: [sigma_log__, beta, alpha]
Traceback (most recent call last):

  File "<ipython-input-1-1ef2ccded6b8>", line 1, in <module>
    runfile('C:/Users/Yurik/.spyder-py3/temp.py', wdir='C:/Users/Yurik/.spyder-py3')

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 705, in runfile
    execfile(filename, namespace)

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 102, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Yurik/.spyder-py3/temp.py", line 57, in <module>
    trace = pm.sample(500)

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\pymc3\sampling.py", line 442, in sample
    trace = _mp_sample(**sample_args)

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\pymc3\sampling.py", line 982, in _mp_sample
    traces = Parallel(n_jobs=cores, mmap_mode=None)(jobs)

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\joblib\parallel.py", line 962, in __call__
    self.retrieve()

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\joblib\parallel.py", line 865, in retrieve
    self._output.extend(job.get(timeout=self.timeout))

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\joblib\_parallel_backends.py", line 515, in wrap_future_result
    return future.result(timeout=timeout)

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\joblib\externals\loky\_base.py", line 431, in result
    return self.__get_result()

  File "C:\Users\Yurik\Anaconda3\lib\site-packages\joblib\externals\loky\_base.py", line 382, in __get_result
    raise self._exception

BrokenProcessPool: A process in the executor was terminated abruptly while the future was running or pending.

Answer 1

我终于明白了！跟踪函数后，我注意到 loky 正在获取 cores = None，并且有一个可选参数。因此，该示例需要在 pm.sample 的参数中包含 cores = 1（或类似的），然后才能正常工作！喜欢下面

with basic_model: 
   # draw 500 posterior samples 
   trace = pm.sample(500, cores=1)

（尽管值得注意的是我需要安装/重新安装一些依赖项，theanos 和 mw64 或类似的东西，甚至在我到达这一点之前）

pymc3 不工作，使用 Anaconda3 出现 nan 和 none 类型错误

pymc3 not working, getting nan and none type errors using Anaconda3

python

python-3.x

anaconda

pymc

pymc3