Calamari 2.2

[mikegerber]

Calamari 2.0 is out.

I don't see benefits from updating the dependency, other than staying uptodate/compatible.

[kba]

@maxnth @andbue @ChWick can answer this more accurately but there were quite a few refactorings and performance enhancements since the last 1.x release v1.0.5. It is not time-critical to upgrade as soon as possible but I think it would be good to get started assessing what the benefits are, what has changed and how to proceed with adapting.

[mikegerber]

#54 is possibly related

[andbue]

Hi, I don't think it should be too complicated to update ocr_calamari to 2.0. The whole preprocessing stuff is loaded according to the definition in the model, so I was wrong to assume you're somehow circumventing it – sorry about that!
The cleanest and probably most efficient way would be to implement a custom DataReader class that somehow handles the workspace data. I'm not sure, however, if your data classes can be pickled and sent to worker threads without problems.

If it helps, you could have a look at my client that caches preprocessed lines in a hdf5 file. I wrote a reader and included it in the DataReaderFactory here. Prediction happens here. Other than setting up the dataset and the removal of the preprocessing (which you should avoid), this is in most parts taken from predict.py anyway.

[bertsky]

Just wanted to note that Calamari 2 depends on tfaip which requires Python >= 3.7 – which would remove support for the default Python version on OCR-D's (still) default target Ubuntu 18.

[mikegerber]

I have opened Calamari-OCR/calamari#304 because Calamari 2.1.x depended on TF 2.4.x (PyPI-incompatible with Python 3.9...), but @andbue already updated Calamari 2.2(!) to remove this restriction. 👍

With this TF version hell I think I'll first update the test rigging to test on all Python versions 3.7-3.9 (maybe even 3.10).

[mikegerber]

Heads up: I'm working on this

[bertsky]

@mikegerber, do already have something you could share (as a feature branch)? I guess there are multiple API changes to cope with, plus perhaps a need to deal with model migration?

[stefanCCS]

Hi everybody,
any update concerning this, as OCR-D now supports Python 3.7 ?

[mikegerber]

Sorry for not keeping anyone up to date: I plan to work on this further in the coming week!

[bertsky]

Do you have any news for us @mikegerber? Have you looked at the native PAGE-XML output of Calamari 2 – is it re/usable?