Originally posted by: Tnash310

Has anyone tried to use the incumbent callback in Python? I get the following error when I tried to register the callback.

File "/home/arulselv/python/x86_debian4.0_4.1/cplex/callbacks.py", line 1565, in __init__
self._cb_set_function = _internal._procedural.setincumbentcallbackfunc
AttributeError: 'module' object has no attribute 'setincumbentcallbackfunc'

This specific callback is not used in the example files I have seen. The above error seems to be present in _init__ of the IncumbentCallback class in callbacks.py. Does it mean that I have to set some parameters before I register? I can't recall doing this in C++. I seem to be goofing up somewhere :(

Any help is appreciated. Thanks in advance.
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Originally posted by: Tnash310

It does look like the setincumbentcallbackfunc was not defined in _internal/_procedural.py file. I defined this and now it is registering the callback properly. I don't know if this has any repercussions.

We'll see :)
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Originally posted by: SystemAdmin

Hello,

This was a known issue in an early version of the CPLEX Python API. It has been fixed since CPLEX version 12.2. While the fix that you implemented yourself should allow you to use an incumbent callback, there are several other bug fixes in the more recent versions of CPLEX. If you can upgrade to the latest version, I encourage you to do so.

Thanks,

Philip Starhill
CPLEX Research Engineer
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Originally posted by: Tnash310

Hello Phillip,
Thanks for the reply. I will get upgraded.

Regards,
Ashwin
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