Add trainer callbacks for Transformer NER (#377)

CU-86938vf30 add trainer callbacks for Transformer NER

medcat/ner/transformers_ner.py

@@ -1,6 +1,7 @@
 import os
 import json
 import logging
+import datasets
 from spacy.tokens import Doc
 from datetime import datetime
 from typing import Iterable, Iterator, Optional, Dict, List, cast, Union
@@ -18,7 +19,7 @@
 
 from transformers import Trainer, AutoModelForTokenClassification, AutoTokenizer
 from transformers import pipeline, TrainingArguments
-import datasets
+from transformers.trainer_callback import TrainerCallback
 
 # It should be safe to do this always, as all other multiprocessing
 #will be finished before data comes to meta_cat
@@ -137,7 +138,12 @@ def merge_data_loaded(base, other):
 
         return out_path
 
-    def train(self, json_path: Union[str, list, None]=None, ignore_extra_labels=False, dataset=None, meta_requirements=None):
+    def train(self,
+              json_path: Union[str, list, None]=None,
+              ignore_extra_labels=False,
+              dataset=None,
+              meta_requirements=None,
+              trainer_callbacks: Optional[List[TrainerCallback]]=None):
         """Train or continue training a model give a json_path containing a MedCATtrainer export. It will
         continue training if an existing model is loaded or start new training if the model is blank/new.
 
@@ -149,6 +155,9 @@ def train(self, json_path: Union[str, list, None]=None, ignore_extra_labels=Fals
             ignore_extra_labels:
                 Makes only sense when an existing deid model was loaded and from the new data we want to ignore
                 labels that did not exist in the old model.
+            trainer_callbacks (List[TrainerCallback]):
+                A list of trainer callbacks for collecting metrics during the training at the client side. The
+                transformers Trainer object will be passed in when each callback is called.
         """
 
         if dataset is None and json_path is not None:
@@ -193,6 +202,9 @@ def train(self, json_path: Union[str, list, None]=None, ignore_extra_labels=Fals
                 compute_metrics=lambda p: metrics(p, tokenizer=self.tokenizer, dataset=encoded_dataset['test'], verbose=self.config.general['verbose_metrics']),
                 data_collator=data_collator, # type: ignore
                 tokenizer=None)
+        if trainer_callbacks:
+            for callback in trainer_callbacks:
+                trainer.add_callback(callback(trainer))
 
         trainer.train() # type: ignore
 

tests/ner/test_transformers_ner.py

@@ -0,0 +1,50 @@
+import os
+import unittest
+from spacy.lang.en import English
+from spacy.tokens import Doc, Span
+from transformers import TrainerCallback
+from medcat.ner.transformers_ner import TransformersNER
+from medcat.config import Config
+from medcat.cdb_maker import CDBMaker
+
+
+class TransformerNERTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls) -> None:
+        config = Config()
+        config.general["spacy_model"] = "en_core_web_md"
+        cdb_maker = CDBMaker(config)
+        cdb_csv = os.path.join(os.path.dirname(os.path.realpath(__file__)), "..", "..", "examples", "cdb.csv")
+        cdb = cdb_maker.prepare_csvs([cdb_csv], full_build=True)
+        Doc.set_extension("ents", default=[], force=True)
+        Span.set_extension("confidence", default=-1, force=True)
+        Span.set_extension("id", default=0, force=True)
+        Span.set_extension("detected_name", default=None, force=True)
+        Span.set_extension("link_candidates", default=None, force=True)
+        Span.set_extension("cui", default=-1, force=True)
+        Span.set_extension("context_similarity", default=-1, force=True)
+        cls.undertest = TransformersNER(cdb)
+        cls.undertest.create_eval_pipeline()
+
+    def test_pipe(self):
+        doc = English().make_doc("\nPatient Name: John Smith\nAddress: 15 Maple Avenue\nCity: New York\nCC: Chronic back pain\n\nHX: Mr. Smith")
+        doc = next(self.undertest.pipe([doc]))
+        assert len(doc.ents) > 0, "No entities were recognised"
+
+    def test_train(self):
+        tracker = unittest.mock.Mock()
+        class _DummyCallback(TrainerCallback):
+            def __init__(self, trainer) -> None:
+                self._trainer = trainer
+            def on_epoch_end(self, *args, **kwargs) -> None:
+                tracker.call()
+
+        train_data = os.path.join(os.path.dirname(os.path.realpath(__file__)), "..", "resources", "deid_train_data.json")
+        self.undertest.training_arguments.num_train_epochs = 1
+        df, examples, dataset = self.undertest.train(train_data, trainer_callbacks=[_DummyCallback, _DummyCallback])
+        assert "fp" in examples
+        assert "fn" in examples
+        assert dataset["train"].num_rows == 48
+        assert dataset["test"].num_rows == 12
+        self.assertEqual(tracker.call.call_count, 2)