theano.test（）：由于常量折叠而导致优化失败（在ubuntu上）

Question

在Ubuntu操作系统上运行theano.test（）时，会生成一些有关优化失败的错误消息，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})]')

有人知道解决这些问题的方法吗，或者到底是怎么回事？