The documentation of the function bob.measure.cmc (http://pythonhosted.org/bob.measure/py_api.html#bob.measure.cmc) says that the output is

"A 2D float array representing the CMC curve, with the Rank in the first column and the number of correctly classified clients (in this rank) in the second column."

This is not what is happening. The function returns a 1D array representing the CMC curve, with the identification rate sorted by the rank in ascending order.