RuntimeError使用时Theano在芹菜芹菜工人共享变量

Question

我有一个Celery task称为simple_theano_tasks：

@app.task(bind=True, queue='test') 
def simple_theano_tasks(self): 
    import theano, numpy as np 
    my_array = np.zeros((0,), dtype=theano.config.floatX) 
    shared = theano.shared(my_array, name='my_variable', borrow=True) 
    print 'Done. Shared value is {}'.format(shared.get_value()) 

---

当THEANO是配置使用CPU，一切正常（无错误）：

$ THEANO_FLAGS=device=cpu celery -A my_project worker -c1 -l info -Q test 

[INFO/MainProcess] Received task: my_project.tasks.simple_theano_tasks[xxxx]

[WARNING/Worker-1] Done. Shared value is []

[INFO/MainProcess] Task my_project.tasks.simple_theano_tasks[xxxx] succeeded in 0.00407959899985s

---

现在，当我做同样的事情与GPU启用，Theano（或CUDA）引发错误：

$ THEANO_FLAGS=device=gpu celery -A my_project worker -c1 -l info -Q test 

...

Using gpu device 0: GeForce GTX 670M (CNMeM is enabled)

...

[INFO/MainProcess] Received task: my_project.tasks.simple_theano_tasks[xxx]

[ERROR/MainProcess] Task my_project.tasks.simple_theano_tasks[xxx] raised unexpected: RuntimeError("Cuda error 'initialization error' while copying %lli data element to device memory",)

Traceback (most recent call last):

File "/.../local/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task R = retval = fun(*args, **kwargs)

File "/.../local/lib/python2.7/site-packages/celery/app/trace.py", line 438, in protected_call return self.run(*args, **kwargs)

File "/.../my_project/tasks.py", line 362, in simple_theano_tasks shared = theano.shared(my_array, name='my_variable', borrow=True)

File "/.../local/lib/python2.7/site-packages/theano/compile/sharedvalue.py", line 247, in shared allow_downcast=allow_downcast, **kwargs)

File "/.../local/lib/python2.7/site-packages/theano/sandbox/cuda/var.py", line 229, in float32_shared_constructor deviceval = type_support_filter(value, type.broadcastable, False, None) RuntimeError: Cuda error 'initialization error' while copying %lli data element to device memory

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最后，当我运行在完全相同的代码一个Python壳我没有任何错误：

$ THEANO_FLAGS=device=gpu python 
Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import theano, numpy as np 
Using gpu device 0: GeForce GTX 670M (CNMeM is enabled) 
>>> my_array = np.zeros((0,), dtype=theano.config.floatX) 
>>> shared = theano.shared(my_array, name='my_variable', borrow=True) 
>>> print 'Done. Shared value is {}'.format(shared.get_value()) 
Done. Shared value is [] 

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不任何人都有一个想法：

• 为什么在芹菜工人内theano行为不同？
• 如何解决这个问题？

---

一些附加的上下文：

• 我使用theano @ 0.7.0和Celery @ 3.1.18

• “〜/ .theanorc” 文件

[global]

floatX=float32

device=gpu

[mode]=FAST_RUN

[nvcc]

fastmath=True

[lib]

cnmem=0.1

[cuda]

root=/usr/local/cuda

Answer 1

一种解决方法是：

1. 指定CPU作为目标设备（在 “.theanorc” 或使用 “THEANO_FLAGS =设备= CPU”）
2. 后来，重写所分配的设备到指定的GPU

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芹菜现在的任务是：

@app.task(bind=True, queue='test') 
def simple_theano_tasks(self): 
    # At this point, no theano import statements have been processed, and so the device is unbound 
    import theano, numpy as np 
    import theano.sandbox.cuda 
    theano.sandbox.cuda.use('gpu') # enable gpu 
    my_array = np.zeros((0,), dtype=theano.config.floatX) 
    shared = theano.shared(my_array, name='my_variable', borrow=True) 
    print 'Done. Shared value is {}'.format(shared.get_value()) 

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注：I found the solution reading this article about using multiple GPU