Add simple pretrained model: oracat/bert-paper-classifier

This model predicts category for biomedical papers.
Link to model: https://huggingface.co/oracat/bert-paper-classifier.

src/category_classification/models/oracat__bert_paper_classifier/model.py

@@ -0,0 +1,17 @@
+from transformers import pipeline
+
+name = "oracat/bert-paper-classifier"
+
+
+class BertPaperClassifierModel:
+    def __init__(self):
+        self.pipeline = pipeline("text-classification", model=name)
+
+    def __call__(self, input):
+        return self.pipeline(input.title + ' ' + input.abstract)
+
+    def __getstate__(self):
+        return self.__dict__
+
+def get_model():
+    return BertPaperClassifierModel()