use Processor.resolve_files to handle on-demand download of models via registry

ocrd_calamari/recognize.py

@@ -41,7 +41,8 @@ class CalamariRecognize(Processor):
         os.environ['TF_CPP_MIN_LOG_LEVEL'] = TF_CPP_MIN_LOG_LEVEL
 
         if self.parameter.get('checkpoint_dir', None):
-            self.parameter['checkpoint'] = '%s/*.ckpt.json' % self.parameter['checkpoint_dir']
+            resolved = self.resolve_resource(self.parameter['checkpoint_dir'])
+            self.parameter['checkpoint'] = '%s/*.ckpt.json' % resolved
         checkpoints = glob(self.parameter['checkpoint'])
         self.predictor = MultiPredictor(checkpoints=checkpoints)
 

requirements.txt

@@ -3,4 +3,4 @@ tensorflow >= 2.3.0rc2
 calamari-ocr == 1.0.*
 setuptools >= 41.0.0  # tensorboard depends on this, but why do we get an error at runtime?
 click
-ocrd >= 2.13.0
+ocrd >= 2.22.0