Error in building classifier model

[cta-observatory]

Error in building classifier model

[HealthyPear]

Running a mini-test using 2 gamma runs for energy estimation & 2 gamma runs + 2 proton runs for classification, I managed to get to the end.
Of course, I got warnings related to the small statistics, but I didn't get your same error.

I guess the energy model was produced without any problem.

As far as I see there are three places in which something could go wrong:

• the use of the merge script,
• the commands launched,
• the configuration file.

I propose to go step-by-step into each of these.

[adonini]

I guess the energy model was produced without any problem.

yess I had no problems and in the merging, both the files (gamma and proton) seem fine. All the columns have values, except for the ones labeled err_est_pos and err_est_dir, that are nan, but I don't think this is the problem.
I launched the script with the following command:

python adonini/protopipe/protopipe/scripts/build_model.py --config_file adonini/proto_output/configs/protopipe/classifier.yaml --tail

Instead for the dl1_write I used:

python /adonini/protopipe/protopipe/scripts/write_dl1.py
--config_file adonini/proto_output/configs/protopipe/analysis.yaml
-o adonini/proto_output/data/DL1/for_classification/${output_name}.h5
-i adonini/proto_output/data/DL0/for_classification/ -f "$filename" --tail
--estimate_energy True --regressor_dir adonini/proto_output/estimators/energy_regressor

Regarding the configuration file I only add my directory and I left the parameters you had.

[adonini]

I found the problem: the value of the parameter offset in divergent data. This parameter is calculated as
offset = angular_separation(run_array_direction[0],run_array_direction[1], reco_result.az, reco_result.alt)
but in divergent mode there's no "array_direction", and by default is set at 90deg. Thus the value I obtained for the offset parameter are around 20deg, since in the MCs the source is simulated at Zd 20deg.
In the configuration file classifier.yaml the cut for this parameter is set at 0.1 and 0.5, so in my case no data can pass these cuts.

[HealthyPear]

Hi Alice,

Can you confirm that this is fixed in your analysis by just modifying the model building configuration (namely, just the appropriate YAML file)?

If this is true, this is not really a bug and we can just add an appropriate section in the docs to let people know.

[adonini]

Hi, yes it's not a bug it's just the missing of an array_direction in divergent mode. Actually modifying the YAML file is not a good idea because you have problem later in the performance calculation. For now I hard coded the value of the array pointing in the code, but with simtel is possible to define an array_direction in case of different telescope pointing, so with new simulations there should be no problem. Anyway regarding this we opened PR #38

[HealthyPear]

Perfetct! This helps to clear thing up.

So (I add to the discussion also @vuillaut, which opened said PR) if I understand correctly:

• the PR should solve, even if indirectly, this issue
• it is anyway needed for the new simulations (I assume you mean simulations dedicated to divergent pointing - if it is not already true, should the same PR take into account this?)

[HealthyPear]

FINAL UPDATE

This is now solved by simtel for newer divergent simulations.