Expose parsers when building a pipeline through ParsingNeuralNetwork

[ptoupas]

• Added getParser() method to ParsingNeuralNetwork Class with a default value for parserID = 0

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 33.30%. Comparing base (dbb9dff) to head (71f054d).

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
depthai_nodes/parsing_neural_network.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #149   +/-   ##
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  Coverage   33.29%   33.30%           
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  Files          69       69           
  Lines        3835     3840    +5     
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+ Hits         1277     1279    +2     
- Misses       2558     2561    +3     

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[klemen1999]

Generally LGTM

[klemen1999]

What are your thoughts on having default value here? The other option is that you have to explicitly speciffy the parserID but I agree that in 90% of the cases users are dealing with 1parser NNs so this would be then the desired behaviour. CC: @jkbmrz @kkeroo @aljazkonec1

[jkbmrz]

We could also set the default value to None and if no value is provided:

• return the parser at zero index if there is only one parser available,
• error out if there is multiple parsers available to avoid mistakes.

BTW, is parserID a good naming? I think parser_index would be more appropriate.

[aljazkonec1]

Having an int value set to None would work but could cause issues down the line when porting to depthai. The function name getParser implies that only one is returned and I would just update the docstring such that it explicitly states which one is returned ( i.e. something like: The first parser is returned by default if multiple parsers available).

Regarding the naming, I would switch to snake case (to be consistent with other variables/attributes). index does make slightly more sense.

[kkeroo]

I would leave the default option, so calling getParser() returns the first one. I'm fine with both ways of doing it (Petros' way and Jakob's way).