Ceres - Iteration callback and state variables.

[anders.n...@gmail.com]

Hi, 

Setup info:

I'm running Ceres version 1.11.0, Windows 64 with the following CMake configuration:  -G "Visual Studio 14 2015 Win64"  -DOPENMP=OFF -DGFLAGS=OFF -DMINIGLOG=ON. All other flags are default.

Problem:

I want to access the updated state variables(the Ceres parameter blocks), in each solver iteration. Instead I always get the initial values.

If I understand the documentation correctly, I need to do the following things to achieve this:

1) Set the Ceres::Solver::Options update_state_every_iteration flag to true.

2) Override the Ceres::Iteration::Callback, "CallbackReturnType operator()(const IterationSummary& summary)" in my class inheriting from Ceres::Iteration::Callback.

3) Access the problem parameter blocks by using problem.GetParameterBlocks(parameterBlocks)", where problem is a reference member in my Iteration Callback class inheriting from Ceres::Iteration::Callback, and parameterBlocks is a local variable of type std::vector<double*>

Question Doing 1,2,3 always gives me the same values of the parameter blocks, what am I missing?

Regards,

Anders

[Sameer Agarwal]

Anders,
Are the iterations actually successful? Parameter blocks only get updated on successful iterations.
Sameer

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[anders.n...@gmail.com]

Hi, 

You were correct. The iteration summary states that the iteration failed. 

I found the problem causing this, my bad It is working as described in the documentation.

Thank you for pointing me in the right direction and quick reply.

Regards,

Anders