Logging

[Deane Yang]

When I use the solver in a command-line program, it seems to send at least some error/warning messages to STDERR/STDOUT, even if I have set logging_type to SILENT. Is this to be expected? Is there any way to turn *all* messages off?

[Sameer Agarwal]

that only applies to the trust region solver.

you are likely using miniglog.

I recommend using the real glog, or there is a compiler define inside miniglog to silence it completely.

On Wed, Mar 16, 2016 at 12:57 PM Deane Yang <dean...@gmail.com> wrote:

When I use the solver in a command-line program, it seems to send at least some error/warning messages to STDERR/STDOUT, even if I have set logging_type to SILENT. Is this to be expected? Is there any way to turn *all* messages off?

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[Deane Yang]

Thanks. I thought I had built the OSX static library using glog. Is there any way to check which logging software I'm using? When I check the symbols using nm I see:

U __ZN6google10LogMessage6streamEv

                 U __ZN6google15LogMessageFatalC1EPKci

                 U __ZN6google15LogMessageFatalC1EPKciRKNS_13CheckOpStringE

                 U __ZN6google15LogMessageFatalD1Ev

0000000000002f40 S __ZN6google17MakeCheckOpStringIiiEEPNSt3__112basic_stringIcNS1_11char_traitsIcEENS1_9allocatorIcEEEERKT_RKT0_PKc

                 U __ZN6google4base21CheckOpMessageBuilder7ForVar2Ev

                 U __ZN6google4base21CheckOpMessageBuilder9NewStringEv

                 U __ZN6google4base21CheckOpMessageBuilderC1EPKc

                 U __ZN6google4base21CheckOpMessageBuilderD1Ev

[Sameer Agarwal]

that looks about right.

what messages are you seeing? if you do not have -logtostderr enabled, you should not see anything from the solver on stdout or stderr.

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[Deane Yang]

Just tried some examples and am not seeing the messages. I'll post again, if I see it again and paste the messages produced. Thanks for the quick responses.

[Deane Yang]

Here is the kind of message I get:

WARNING: Logging before InitGoogleLogging() is written to STDERR

W0317 12:22:28.431686 1985463040 residual_block.cc:130] 

Error in evaluating the ResidualBlock.

There are two possible reasons. Either the CostFunction did not evaluate and fill all    

residual and jacobians that were requested or there was a non-finite value (nan/infinite)

generated during the or jacobian computation. 

Residual Block size: 1 parameter blocks x 1 residuals

For each parameter block, the value of the parameters are printed in the first column   

and the value of the jacobian under the corresponding residual. If a ParameterBlock was 

held constant then the corresponding jacobian is printed as 'Not Computed'. If an entry 

of the Jacobian/residual array was requested but was not written to by user code, it is 

indicated by 'Uninitialized'. This is an error. Residuals or Jacobian values evaluating 

to Inf or NaN is also an error.  

Residuals:              nan 

Parameter Block 0, size: 5

           0 |          nan 

           0 |          nan 

           0 |          nan 

           0 |          nan 

           0 |          nan 

I do want to see these messages when working on the code, but not when it gets released.

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[Sameer Agarwal]

two things.

1. the first message has do with calling initialization code which you should in your main program before using glog for the first time. you can find example code in ceres examples.

That should give you fine scale control over your errors.

two, the error you are seeing is serious and should likely be visible to you and others using your software, though it can be confusing.

Sameer

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[Deane Yang]

Many thanks for the answers, especially the initialization of the logging. Somehow I missed that.

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[Keir Mierle]

Sorry to resurrect this thread. Deane, were you able to figure out the issues with your cost function? If the error message above was not clear to you, I'd like to update it. The message is supposed to speak directly to the Ceres user and tell they made a bug :)

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[Deane Yang]

Keir,

The error message about evaluating the Residual Block is essentially fine, and I was able to resolve the issue. It was the warning about initializing glog that I did not understand. Here, the message doesn't tell me much, and there is nothing in the documentation about the need to do the initialization. It's easy to overlook in the sample code. I think just putting a comment just before the "google::InitGoogleLogging(argv[0]);", explaining the need for it, would suffice.

Best,

Deane

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[Deane Yang]

Also, perhaps there could be a little more explanation of what can be controlled by the logging options and what will still be sent to std::cout/std::cerr, even if logging is set to SILENT.

I also would still prefer an option to not send anything at all to std::cout/std::cerr. If I pass a library using ceres to someone else, who builds an executable using it, they will see this output, even if they don't want to. The error I posted was a serious one, but there are others that are essentially warnings and can be ignored.

[Deane Yang]

I'd still like to suppress logging to std::cout and std::cerr. Is there any way to redirect the logging output to something besides std::cerr without redirecting std::cerr itself?

[Sameer Agarwal]

Deane, there may be a way of telling glog not to log. I recommend looking at the google-glog documentation/api.

Sameer

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