how to access the node ID inside the generic callback

5. RE: how to access the node ID inside the generic callback

Like

S Y

Posted Mon October 11, 2021 10:18 PM
Edited by System Admin Fri January 20, 2023 04:25 PM

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y
------------------------------

Original Message

6. RE: how to access the node ID inside the generic callback

Like

S Y

Posted Mon October 11, 2021 10:27 PM

Hi,

What if I use context.getLongInfo(IloCplex.Callback.Context.Info.NodeCount);? Would that work for me? For instance, when it is zero, does that mean I am at the root node? Also, when I print that nodeCount inside the callback function, this is what I see in the log. Why is it visiting the same node tens of times?

Nodes Cuts/
Node Left Objective IInf Best Integer Best Bound ItCnt Gap

* 0+ 0 12.1439 48.0425 295.61%
0
0
0
0 0 30.4616 2 12.1439 30.4616 7 150.84%
0
0
0
0
0 0 30.4616 6 12.1439 Cuts: 3 65 150.84%
0
0
0

------------------------------
S Y
------------------------------

Original Message

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

7. RE: how to access the node ID inside the generic callback

Like

Paul Rubin

Posted Tue October 12, 2021 11:18 AM

NodeCount won't work -- it gives the cumulative number of nodes processed, not the ID number of the current node.

I think the correct syntax for the call would be

long my_ID = context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University
------------------------------

Original Message

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

8. RE: how to access the node ID inside the generic callback

Like

S Y

Posted Tue October 12, 2021 11:37 AM

Thanks for the suggestion, but it was indeed the first thing I tried. I am getting an error.

NodeUID cannot be resolved or is not a field

IloCplex.Callback.Context.Info. only has the following methods.

------------------------------
S Y
------------------------------

Original Message

Original Message:
Sent: Tue October 12, 2021 11:17 AM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

NodeCount won't work -- it gives the cumulative number of nodes processed, not the ID number of the current node.

I think the correct syntax for the call would be

long my_ID = context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

9. RE: how to access the node ID inside the generic callback
Best Answer

Like

Vincent Beraudier

Posted Tue October 12, 2021 12:17 PM

Are you using a new version of CPLEX or an old one?
Some fields of the callback info were introduced only starting with 12.10.

------------------------------
Vincent Beraudier
------------------------------

Original Message

Original Message:
Sent: Tue October 12, 2021 11:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for the suggestion, but it was indeed the first thing I tried. I am getting an error.

NodeUID cannot be resolved or is not a field

IloCplex.Callback.Context.Info. only has the following methods.

------------------------------
S Y

Original Message:
Sent: Tue October 12, 2021 11:17 AM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

NodeCount won't work -- it gives the cumulative number of nodes processed, not the ID number of the current node.

I think the correct syntax for the call would be

long my_ID = context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

10. RE: how to access the node ID inside the generic callback

Like

S Y

Posted Tue October 12, 2021 12:33 PM

Hi,

I am using CPLEX 12.8. Should I update CPLEX? If so, could you share a link for the academic version?

------------------------------
S Y
------------------------------

Original Message

Original Message:
Sent: Tue October 12, 2021 12:17 PM
From: Vincent Beraudier
Subject: how to access the node ID inside the generic callback

Are you using a new version of CPLEX or an old one?
Some fields of the callback info were introduced only starting with 12.10.

------------------------------
Vincent Beraudier

Original Message:
Sent: Tue October 12, 2021 11:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for the suggestion, but it was indeed the first thing I tried. I am getting an error.

NodeUID cannot be resolved or is not a field

IloCplex.Callback.Context.Info. only has the following methods.

------------------------------
S Y

Original Message:
Sent: Tue October 12, 2021 11:17 AM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

NodeCount won't work -- it gives the cumulative number of nodes processed, not the ID number of the current node.

I think the correct syntax for the call would be

long my_ID = context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

11. RE: how to access the node ID inside the generic callback

Like

Vincent Beraudier

Posted Wed October 13, 2021 04:13 AM

Follow this link to the CPLEX info page in Academic Initiative:
https://www.ibm.com/academic/topic/data-science?ach_id=6fe17098-43df-4a9d-8412-3377286841a3

Click the Download link - it will lead you to the IBM Academic Initiative download link.
Click "Search for software" on the left menu.
In the "Find by search text" section, enter "CPLEX Optimization Studio 20.1" as the product name.
Then click the search icon.

------------------------------
Vincent Beraudier
------------------------------

Original Message

Original Message:
Sent: Tue October 12, 2021 12:32 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I am using CPLEX 12.8. Should I update CPLEX? If so, could you share a link for the academic version?

------------------------------
S Y

Original Message:
Sent: Tue October 12, 2021 12:17 PM
From: Vincent Beraudier
Subject: how to access the node ID inside the generic callback

Are you using a new version of CPLEX or an old one?
Some fields of the callback info were introduced only starting with 12.10.

------------------------------
Vincent Beraudier

Original Message:
Sent: Tue October 12, 2021 11:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for the suggestion, but it was indeed the first thing I tried. I am getting an error.

NodeUID cannot be resolved or is not a field

IloCplex.Callback.Context.Info. only has the following methods.

------------------------------
S Y

Original Message:
Sent: Tue October 12, 2021 11:17 AM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

NodeCount won't work -- it gives the cumulative number of nodes processed, not the ID number of the current node.

I think the correct syntax for the call would be

long my_ID = context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 10:18 PM
From: S Y
Subject: how to access the node ID inside the generic callback

I am using i) JAVA API and ii) synchronized keyword to guarantee thread safety.

I pass IloCplex.Callback.Context context inside the invoke method. In order to obtain the node ID, I call
long my_ID= context.getLongInfo(IloCplex.Callback.Context.Info, NODEUID);

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 09:52 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

Sorry, I meant to say you want the getLongInfo() method. The node ID will be type long. If it does not work, you should tell us what goes wrong (exception thrown, error message, ...) and show us the syntax you are using. Also, you did not specify in the question what API you are using.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 08:57 PM
From: S Y
Subject: how to access the node ID inside the generic callback

Thanks for your message. I went through the links below, but could not figure it out. It seems like there is no method called Info. There are getIntInfo, getDOubleInfo and getLongInfo methods defined in context. As an argument, I pass NodeUID inside either of these methods, however, it does not work.

https://www.ibm.com/docs/de/icos/12.10.0?topic=enums-ilocplexcallbackcontextinfo
https://www.ibm.com/docs/en/icos/20.1.0?topic=namespace-cplexcallbackcontextinfo-enumeration
https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo
https://www.ibm.com/docs/api/v1/content/SSSA5P_12.10.0/ilog.odms.cplex.help/refjavacplex/html/ilog/cplex/IloCplex.Callback.Context.Info.html#valueOf(java.lang.String)

------------------------------
S Y

Original Message:
Sent: Mon October 11, 2021 12:32 PM
From: Paul Rubin
Subject: how to access the node ID inside the generic callback

getId() gets the context from which the callback was called. Try getInfo(), passing it NodeUID as the "which" argument.

------------------------------
Paul Rubin
Professor Emeritus
Michigan State University

Original Message:
Sent: Mon October 11, 2021 09:37 AM
From: S Y
Subject: how to access the node ID inside the generic callback

Hi,

I'd like to get the node number of the B&B tree inside the method that implements IloCplex.Callback.Function. When I call context.getId(), it always returns either 32 or 64. So I believe that is not the function that I am looking for. Which method should I be using?

I am receiving the error below.

- IloCplex.Callback.Context.Info cannot be resolved to a
variable
- NODEUID cannot be resolved to a variable

------------------------------
S Y
------------------------------
#DecisionOptimization

12. RE: how to access the node ID inside the generic callback

Like

Ser Y

Posted Wed October 13, 2021 08:29 AM
Edited by System Admin Fri January 20, 2023 04:15 PM

When I call

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

I receive the following error and I am using the last version of CPLEX.

Exception from callback: ilog.cplex.CpxException: CPLEX Error 1811: Attempt to invoke unsupported operation..

Exception in thread "main" ilog.cplex.CpxException: CPLEX Error 1006: Error during callback.

at ilog.cplex.CplexI.CALL(CplexI.java:5314)

at ilog.cplex.CplexI.setStatus(CplexI.java:6816)

at ilog.cplex.CplexI.access$600(CplexI.java:191)

at ilog.cplex.CplexI$SolveHandle.stop(CplexI.java:3175)

at ilog.cplex.CplexI.solve(CplexI.java:3225)

at ilog.cplex.CplexI.solve(CplexI.java:3217)

at ilog.cplex.IloCplex.solve(IloCplex.java:13291)

#DecisionOptimization

13. RE: how to access the node ID inside the generic callback

Like

Ser Y

Posted Wed October 13, 2021 09:39 AM
Edited by System Admin Fri January 20, 2023 04:09 PM

Here is more information:

System.out.println("print:" +IloCplex.Callback.Context.Info.NodeUID);

try {

long node_ID= context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.out.println("Something went wrong.");

}

print:NodeUID
Something went wrong.

The way I attach the callback in the main method is;

int numThreads = cplex.getNumCores();
final myCallback cb = new myCallback(x,y,t, numThreads);
long contextmask = IloCplex.Callback.Context.Id.Candidate
| IloCplex.Callback.Context.Id.ThreadUp
| IloCplex.Callback.Context.Id.ThreadDown;
contextmask |= IloCplex.Callback.Context.Id.Relaxation;
cplex.use(cb, contextmask);

------------------------------
Ser Y
------------------------------

Original Message

Original Message:
Sent: Wed October 13, 2021 08:28 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

When I call

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

I receive the following error and I am using the last version of CPLEX.

Exception from callback: ilog.cplex.CpxException: CPLEX Error 1811: Attempt to invoke unsupported operation..

Exception in thread "main" ilog.cplex.CpxException: CPLEX Error 1006: Error during callback.

at ilog.cplex.CplexI.CALL(CplexI.java:5314)

at ilog.cplex.CplexI.setStatus(CplexI.java:6816)

at ilog.cplex.CplexI.access$600(CplexI.java:191)

at ilog.cplex.CplexI$SolveHandle.stop(CplexI.java:3175)

at ilog.cplex.CplexI.solve(CplexI.java:3225)

at ilog.cplex.CplexI.solve(CplexI.java:3217)

at ilog.cplex.IloCplex.solve(IloCplex.java:13291)

#DecisionOptimization

14. RE: how to access the node ID inside the generic callback

Like

Vincent Beraudier

Posted Wed October 13, 2021 10:36 AM

Some info getters are available only in some contexts otherwise will raise errors.
See https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo

So NodeUID can be queried only in Relaxation and Candidate, not ThreadUp and not in ThreadDown.

Did you check the context with a
if (context.inRelaxation() || context.inCandidate() )
before calling NodeUID ?

------------------------------
Vincent Beraudier
------------------------------

Original Message

Original Message:
Sent: Wed October 13, 2021 09:39 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

Here is more information:

System.out.println("print:" +IloCplex.Callback.Context.Info.NodeUID);

try {

long node_ID= context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.out.println("Something went wrong.");

}

print:NodeUID
Something went wrong.

The way I attach the callback in the main method is;

int numThreads = cplex.getNumCores();
final myCallback cb = new myCallback(x,y,t, numThreads);
long contextmask = IloCplex.Callback.Context.Id.Candidate
| IloCplex.Callback.Context.Id.ThreadUp
| IloCplex.Callback.Context.Id.ThreadDown;
contextmask |= IloCplex.Callback.Context.Id.Relaxation;
cplex.use(cb, contextmask);

------------------------------
Ser Y

Original Message:
Sent: Wed October 13, 2021 08:28 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

When I call

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

I receive the following error and I am using the last version of CPLEX.

Exception from callback: ilog.cplex.CpxException: CPLEX Error 1811: Attempt to invoke unsupported operation..

Exception in thread "main" ilog.cplex.CpxException: CPLEX Error 1006: Error during callback.

at ilog.cplex.CplexI.CALL(CplexI.java:5314)

at ilog.cplex.CplexI.setStatus(CplexI.java:6816)

at ilog.cplex.CplexI.access$600(CplexI.java:191)

at ilog.cplex.CplexI$SolveHandle.stop(CplexI.java:3175)

at ilog.cplex.CplexI.solve(CplexI.java:3225)

at ilog.cplex.CplexI.solve(CplexI.java:3217)

at ilog.cplex.IloCplex.solve(IloCplex.java:13291)

#DecisionOptimization

15. RE: how to access the node ID inside the generic callback

Like

Ser Y

Posted Wed October 13, 2021 10:53 AM
Edited by System Admin Fri January 20, 2023 04:11 PM

Okay, I was mistaken. The problem is not solved. It has nothing to do with the number of threads.

I have tried what you suggested.

if (context.inRelaxation() || context.inCandidate() ) {

try {

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.err.println("Still not working");

}

Version identifier: 20.1.0.0 | 2020-11-10 | 9bedb6d68
CPXPARAM_Emphasis_MIP 2
CPXPARAM_MIP_Strategy_RINSHeur 500
CPXPARAM_TimeLimit 1800
Generic callback 0x66
Lazy constraint(s) or lazy constraint/branch callback is present.
Disabling dual reductions (CPX_PARAM_REDUCE) in presolve.
Disabling presolve reductions that prevent crushing forms (CPX_PARAM_PREREFORM).
Still not working
Still not working
Still not working

------------------------------
Ser Y
------------------------------

Original Message

Original Message:
Sent: Wed October 13, 2021 10:36 AM
From: Vincent Beraudier
Subject: how to access the node ID inside the generic callback

Some info getters are available only in some contexts otherwise will raise errors.
See https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo

So NodeUID can be queried only in Relaxation and Candidate, not ThreadUp and not in ThreadDown.

Did you check the context with a
if (context.inRelaxation() || context.inCandidate() )
before calling NodeUID ?

------------------------------
Vincent Beraudier

Original Message:
Sent: Wed October 13, 2021 09:39 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

Here is more information:

System.out.println("print:" +IloCplex.Callback.Context.Info.NodeUID);

try {

long node_ID= context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.out.println("Something went wrong.");

}

print:NodeUID
Something went wrong.

The way I attach the callback in the main method is;

int numThreads = cplex.getNumCores();
final myCallback cb = new myCallback(x,y,t, numThreads);
long contextmask = IloCplex.Callback.Context.Id.Candidate
| IloCplex.Callback.Context.Id.ThreadUp
| IloCplex.Callback.Context.Id.ThreadDown;
contextmask |= IloCplex.Callback.Context.Id.Relaxation;
cplex.use(cb, contextmask);

------------------------------
Ser Y

Original Message:
Sent: Wed October 13, 2021 08:28 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

When I call

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

I receive the following error and I am using the last version of CPLEX.

Exception from callback: ilog.cplex.CpxException: CPLEX Error 1811: Attempt to invoke unsupported operation..

Exception in thread "main" ilog.cplex.CpxException: CPLEX Error 1006: Error during callback.

at ilog.cplex.CplexI.CALL(CplexI.java:5314)

at ilog.cplex.CplexI.setStatus(CplexI.java:6816)

at ilog.cplex.CplexI.access$600(CplexI.java:191)

at ilog.cplex.CplexI$SolveHandle.stop(CplexI.java:3175)

at ilog.cplex.CplexI.solve(CplexI.java:3225)

at ilog.cplex.CplexI.solve(CplexI.java:3217)

at ilog.cplex.IloCplex.solve(IloCplex.java:13291)

#DecisionOptimization

16. RE: how to access the node ID inside the generic callback

Like

Ser Y

Posted Wed October 13, 2021 11:50 AM
Edited by System Admin Fri January 20, 2023 04:22 PM

If I call context.getLongInfo(IloCplex.Callback.Context.Info.NodeCount);, it is perfectly working tho.

If nodeCount is zero, doesn't that tell me that I am at the root node?

------------------------------
Ser Y
------------------------------

Original Message

Original Message:
Sent: Wed October 13, 2021 10:52 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

Okay, I was mistaken. The problem is not solved. It has nothing to do with the number of threads.

I have tried what you suggested.

if (context.inRelaxation() || context.inCandidate() ) {

try {

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.err.println("Still not working");

}

Version identifier: 20.1.0.0 | 2020-11-10 | 9bedb6d68
CPXPARAM_Emphasis_MIP 2
CPXPARAM_MIP_Strategy_RINSHeur 500
CPXPARAM_TimeLimit 1800
Generic callback 0x66
Lazy constraint(s) or lazy constraint/branch callback is present.
Disabling dual reductions (CPX_PARAM_REDUCE) in presolve.
Disabling presolve reductions that prevent crushing forms (CPX_PARAM_PREREFORM).
Still not working
Still not working
Still not working

------------------------------
Ser Y

Original Message:
Sent: Wed October 13, 2021 10:36 AM
From: Vincent Beraudier
Subject: how to access the node ID inside the generic callback

Some info getters are available only in some contexts otherwise will raise errors.
See https://www.ibm.com/docs/en/icos/20.1.0?topic=manual-cpxcallbackinfo

So NodeUID can be queried only in Relaxation and Candidate, not ThreadUp and not in ThreadDown.

Did you check the context with a
if (context.inRelaxation() || context.inCandidate() )
before calling NodeUID ?

------------------------------
Vincent Beraudier

Original Message:
Sent: Wed October 13, 2021 09:39 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

Here is more information:

System.out.println("print:" +IloCplex.Callback.Context.Info.NodeUID);

try {

long node_ID= context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

}catch(Exception e) {

System.out.println("Something went wrong.");

}

print:NodeUID
Something went wrong.

The way I attach the callback in the main method is;

int numThreads = cplex.getNumCores();
final myCallback cb = new myCallback(x,y,t, numThreads);
long contextmask = IloCplex.Callback.Context.Id.Candidate
| IloCplex.Callback.Context.Id.ThreadUp
| IloCplex.Callback.Context.Id.ThreadDown;
contextmask |= IloCplex.Callback.Context.Id.Relaxation;
cplex.use(cb, contextmask);

------------------------------
Ser Y

Original Message:
Sent: Wed October 13, 2021 08:28 AM
From: Ser Y
Subject: how to access the node ID inside the generic callback

When I call

context.getLongInfo(IloCplex.Callback.Context.Info.NodeUID);

I receive the following error and I am using the last version of CPLEX.

Exception from callback: ilog.cplex.CpxException: CPLEX Error 1811: Attempt to invoke unsupported operation..

Exception in thread "main" ilog.cplex.CpxException: CPLEX Error 1006: Error during callback.

at ilog.cplex.CplexI.CALL(CplexI.java:5314)

at ilog.cplex.CplexI.setStatus(CplexI.java:6816)

at ilog.cplex.CplexI.access$600(CplexI.java:191)

at ilog.cplex.CplexI$SolveHandle.stop(CplexI.java:3175)

at ilog.cplex.CplexI.solve(CplexI.java:3225)

at ilog.cplex.CplexI.solve(CplexI.java:3217)

at ilog.cplex.IloCplex.solve(IloCplex.java:13291)

#DecisionOptimization

Decision Optimization

Decision Optimization