Make `NerModel.__init__()` lazy and add `str()` and `repr()`

ahisto_named_entity_search/recognition/model.py

@@ -36,8 +36,18 @@ class NerModel:
     NUM_VALIDATION_SAMPLES = CONFIG.getint('number_of_validation_samples')
     STOPPING_PATIENCE = CONFIG.getint('stopping_patience')
 
-    def __init__(self, model: AutoModelForTokenClassification):
-        self.model = model
+    def __init__(self, model_name_or_basename: str):
+        self.model_name_or_basename = model_name_or_basename
+
+    @property
+    def model(self) -> AutoModelForTokenClassification:
+        model = AutoModelForTokenClassification.from_pretrained(self.model_name_or_basename)
+
+    def __str__(self) -> str:
+        return self.model_name_or_basename
+
+    def __repr__(self) -> str:
+        return '{}: {}'.format(self.__class__.__name__, self)
 
     @classmethod
     def train_and_save(cls, model_checkpoint_basename: str, model_basename: str,