Parameter Block Size incorrect ?!

[Carsten Klein]

Hello everybody!

I am using ceres solver for simple geometric constraint calculations!

I need to define an AutoDiffCostFunction which computes a 1-dimensional residual based on one 2-dimensional input and another one computing a 2-dimensional residual based on a 2-dimensional input.

Following the tutorial and instruction this should be achieved by:

ceres::CostFunction* cf = new ceres::AutoDiffCostFunction<PointOnPoint, 1, 2>( new PointOnPoint() );
ceres::CostFunction* cf = new ceres::AutoDiffCostFunction<PointDistance, 2, 2>( new PointDistance() );

Setting up the problem by
 
ceres::Problem problem;
problem.AddResidualBlock( cf, NULL, vec);

and solving will lead to the following error:
Check failed: parameter_blocks.size() == cost_function->parameter_block_sizes().size()

vec is a std::vector<double*> containing two pointers to double values which is checked before passing it to the Problem.

Thanks for your help!!

[Sameer Agarwal]

Carsten,

I need to define an AutoDiffCostFunction which computes a 1-dimensional residual based on one 2-dimensional input and another one computing a 2-dimensional residual based on a 2-dimensional input.

Following the tutorial and instruction this should be achieved by:

ceres::CostFunction* cf = new ceres::AutoDiffCostFunction<PointOnPoint, 1, 2>( new PointOnPoint() );
ceres::CostFunction* cf = new ceres::AutoDiffCostFunction<PointDistance, 2, 2>( new PointDistance() );

Both of these imply that the autodiffcost function expects a single parameter block of two dimensions.

 

Setting up the problem by
 
ceres::Problem problem;
problem.AddResidualBlock( cf, NULL, vec);

what you are providing to the user are two parameter blocks of one dimension each. The solution would be to group the two entries in vec as a single parameter block.

HTH,

Sameer

 

and solving will lead to the following error:
Check failed: parameter_blocks.size() == cost_function->parameter_block_sizes().size()

vec is a std::vector<double*> containing two pointers to double values which is checked before passing it to the Problem.

Thanks for your help!!

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