theano.test（）：优化失败由于一个Ubuntu操作系统上constant_folding（ubuntu上）

Question

当运行theano.test（），约优化失败产生一些错误消息如下所示：

ERROR (theano.gof.opt): Optimization failure due to: constant_folding 

ERROR (theano.gof.opt): TRACEBACK: 

ERROR (theano.gof.opt): Traceback (most recent call last): 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/opt.py", line 1286, in process_node 
replacements = lopt.transform(node) 
File "/usr/local/lib/python2.7/dist-packages/theano/tensor/opt.py", line 3996, in constant_folding 
no_recycling=[]) 

File "/usr/local/lib/python2.7/dist-packages/theano/sandbox/cuda/__init__.py", line 237, in make_thunk 
compute_map, no_recycling) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/op.py", line 606, in make_thunk 
output_storage=node_output_storage) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/cc.py", line 948, in make_thunk 
keep_lock=keep_lock) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/cc.py", line 891, in __compile__ 
keep_lock=keep_lock) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/cc.py", line 1322, in cthunk_factory 
key=key, fn=self.compile_cmodule_by_step, keep_lock=keep_lock) 
File "/usr/local/lib/python2.7/dist-packages/theano/gof/cmodule.py", line 996, in module_from_key 
module = next(compile_steps) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/cc.py", line 1237, in compile_cmodule_by_step 
preargs=preargs) 

File "/usr/local/lib/python2.7/dist-packages/theano/sandbox/cuda/nvcc_compiler.py", line 444, in compile_str 
return dlimport(lib_filename) 

File "/usr/local/lib/python2.7/dist-packages/theano/gof/cmodule.py", line 284, in dlimport 
rval = __import__(module_name, {}, {}, [module_name]) 

ImportError: ('/home/csz/.theano/compiledir_Linux-3.11.0-20-generic-x86_64-with-Ubuntu-12.04-precise-x86_64-2.7.3-64/tmpcF2It0/3ea6a99a1a8d1d8523de8d72c27b90f4.so: undefined symbol: _Z25CudaNdarray_CopyFromArrayP11CudaNdarrayP23tagPyArrayObject_fields', '[GpuFromHost(TensorConstant{0.0})]') 

有没有人知道解决这些问题的方法，或究竟发生了什么？

Answer 1

这可能是由很多事情造成的。该错误与GPU有关。所以首先，确保你可以编译nvidia的例子，并且它们运行良好。可以肯定这不是问题。

问题是Theano无法导入它编译的GPU模块，因为他没有找到它需要的符号。这个缺少的符号“_Z25CudaNdarray_CopyFromArrayP11CudaNdarrayP23tagPyArrayObject_fields”位于Theano已经预编译的共享库中。

什么是您的操作系统？确保更新到Theano的最新开发版本。最近有一个修复程序（星期一，如果我的记忆是确切的），可以在某些操作系统上解决此问题。