Python module not found error -

i have followed installation steps explained in python-recsys (http://ocelma.net/software/python-recsys/build/html/installation.html). when running simple script:

from recsys.evaluation.prediction import mae  mae = mae()  mae.compute(4.0, 3.2) 

while using python test_evaluation_metrics.py python script located, receive module not found error:

>> python test_evaluation_metrics.py   traceback (most recent call last): file "test_evaluation_metrics.py", line 1, in <module> recsys.evaluation.prediction import mae importerror: no module named 'recsys' 

the question should pretty basic. nice if let me know, how can manage install module , run program.

thanks in advance