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Allow the user to write their own evaluator #103

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Expose ceres's solver API without requiring the user to use the problem API.

That way they can evaluate things in a manner which is more efficient than 
Ceres' own evaluator.

we could start by just exposing the jacobian evaluator for dense and crs 
jacobian, but the big use case I think will be the gauss-newton hessian..

Original issue reported on code.google.com by sameerag...@google.com on 10 May 2013 at 6:36

GoogleCodeExporter commented 9 years ago 
Exposing this for Sparse/CRS matrices seems to be quite messy. As it breaks 
Ceres' assumptions about memory ownership and layout. Perhaps a good place to 
start is to only expose dense jacobians/hessians. That way memory allocation 
and layout is not an issue.

Original comment by sameerag...@google.com on 2 Jul 2013 at 3:23

GoogleCodeExporter commented 9 years ago 
and if we are going to do a dense jacobian, then just having one cost function 
is the way to go, since the rest of the solver does not care. 

I am going to close this issue for now, since the user can basically do this 
already for the dense case, and I do not see a compelling argument for the 
sparse case yet.

Original comment by sameerag...@google.com on 11 Aug 2013 at 10:09