Hi, I get: Traceback (most recent call last): File "sim_drift_gpu.py", line 4, in <module> import pycuda.gpuarray as gpuarray File "/usr/local/lib/python2.7/dist-packages/pycuda-2011.2.2-py2.7-linux-i686.egg/pycuda/gpuarray.py", line 3, in <module> import pycuda.elementwise as elementwise File "/usr/local/lib/python2.7/dist-packages/pycuda-2011.2.2-py2.7-linux-i686.egg/pycuda/elementwise.py", line 33, in <module> from pycuda.tools import context_dependent_memoize File "/usr/local/lib/python2.7/dist-packages/pycuda-2011.2.2-py2.7-linux-i686.egg/pycuda/tools.py", line 30, in <module> import pycuda.driver as cuda File "/usr/local/lib/python2.7/dist-packages/pycuda-2011.2.2-py2.7-linux-i686.egg/pycuda/driver.py", line 545, in <module> _add_functionality() File "/usr/local/lib/python2.7/dist-packages/pycuda-2011.2.2-py2.7-linux-i686.egg/pycuda/driver.py", line 525, in _add_functionality Function._param_set = function_param_set_pre_v4 NameError: global name 'function_param_set_pre_v4' is not defined I think there is a typo in line 145 in driver.py when CUDA < 4.0 is used: function_param_set -> function_param_set_pre_v4 so that it matches line 524: Function._param_set = function_param_set_pre_v4