Fixed uploading best model checkpoint in NeptuneLogger

CHANGELOG.md

@@ -193,6 +193,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Improved exception message if `rich` version is less than `10.2.2` ([#10839](https://github.com/PyTorchLightning/pytorch-lightning/pull/10839))
 
 
+- Fixed uploading best model checkpoint in NeptuneLogger ([#10369](https://github.com/PyTorchLightning/pytorch-lightning/pull/10369))
+
+
 ## [1.5.4] - 2021-11-30
 
 ### Fixed

pytorch_lightning/loggers/neptune.py

@@ -523,6 +523,16 @@ def after_save_checkpoint(self, checkpoint_callback: "ReferenceType[ModelCheckpo
             file_names.add(model_name)
             self.experiment[f"{checkpoints_namespace}/{model_name}"].upload(key)
 
+        # log best model path and checkpoint
+        if checkpoint_callback.best_model_path:
+            self.experiment[
+                self._construct_path_with_prefix("model/best_model_path")
+            ] = checkpoint_callback.best_model_path
+
+            model_name = self._get_full_model_name(checkpoint_callback.best_model_path, checkpoint_callback)
+            file_names.add(model_name)
+            self.experiment[f"{checkpoints_namespace}/{model_name}"].upload(checkpoint_callback.best_model_path)
+
         # remove old models logged to experiment if they are not part of best k models at this point
         if self.experiment.exists(checkpoints_namespace):
             exp_structure = self.experiment.get_structure()
@@ -531,11 +541,7 @@ def after_save_checkpoint(self, checkpoint_callback: "ReferenceType[ModelCheckpo
             for file_to_drop in list(uploaded_model_names - file_names):
                 del self.experiment[f"{checkpoints_namespace}/{file_to_drop}"]
 
-        # log best model path and best model score
-        if checkpoint_callback.best_model_path:
-            self.experiment[
-                self._construct_path_with_prefix("model/best_model_path")
-            ] = checkpoint_callback.best_model_path
+        # log best model score
         if checkpoint_callback.best_model_score:
             self.experiment[self._construct_path_with_prefix("model/best_model_score")] = (
                 checkpoint_callback.best_model_score.cpu().detach().numpy()
@@ -544,7 +550,7 @@ def after_save_checkpoint(self, checkpoint_callback: "ReferenceType[ModelCheckpo
     @staticmethod
     def _get_full_model_name(model_path: str, checkpoint_callback: "ReferenceType[ModelCheckpoint]") -> str:
         """Returns model name which is string `modle_path` appended to `checkpoint_callback.dirpath`."""
-        expected_model_path = f"{checkpoint_callback.dirpath}/"
+        expected_model_path = f"{checkpoint_callback.dirpath}{os.path.sep}"
         if not model_path.startswith(expected_model_path):
             raise ValueError(f"{model_path} was expected to start with {expected_model_path}.")
         return model_path[len(expected_model_path) :]

tests/loggers/test_neptune.py

@@ -276,14 +276,15 @@ def test_after_save_checkpoint(self, neptune):
             logger, run_instance_mock, run_attr_mock = self._get_logger_with_mocks(
                 api_key="test", project="project", **prefix
             )
+            models_root_dir = os.path.join("path", "to", "models")
             cb_mock = MagicMock(
-                dirpath="path/to/models",
-                last_model_path="path/to/models/last",
+                dirpath=models_root_dir,
+                last_model_path=os.path.join(models_root_dir, "last"),
                 best_k_models={
-                    "path/to/models/model1": None,
-                    "path/to/models/model2/with/slashes": None,
+                    f"{os.path.join(models_root_dir, 'model1')}": None,
+                    f"{os.path.join(models_root_dir, 'model2/with/slashes')}": None,
                 },
-                best_model_path="path/to/models/best_model",
+                best_model_path=os.path.join(models_root_dir, "best_model"),
                 best_model_score=None,
             )
 
@@ -292,19 +293,21 @@ def test_after_save_checkpoint(self, neptune):
 
             # then:
             self.assertEqual(run_instance_mock.__setitem__.call_count, 1)
-            self.assertEqual(run_instance_mock.__getitem__.call_count, 3)
-            self.assertEqual(run_attr_mock.upload.call_count, 3)
+            self.assertEqual(run_instance_mock.__getitem__.call_count, 4)
+            self.assertEqual(run_attr_mock.upload.call_count, 4)
             run_instance_mock.__setitem__.assert_called_once_with(
-                f"{model_key_prefix}/best_model_path", "path/to/models/best_model"
+                f"{model_key_prefix}/best_model_path", os.path.join(models_root_dir, "best_model")
             )
             run_instance_mock.__getitem__.assert_any_call(f"{model_key_prefix}/checkpoints/last")
             run_instance_mock.__getitem__.assert_any_call(f"{model_key_prefix}/checkpoints/model1")
             run_instance_mock.__getitem__.assert_any_call(f"{model_key_prefix}/checkpoints/model2/with/slashes")
+            run_instance_mock.__getitem__.assert_any_call(f"{model_key_prefix}/checkpoints/best_model")
             run_attr_mock.upload.assert_has_calls(
                 [
-                    call("path/to/models/last"),
-                    call("path/to/models/model1"),
-                    call("path/to/models/model2/with/slashes"),
+                    call(os.path.join(models_root_dir, "last")),
+                    call(os.path.join(models_root_dir, "model1")),
+                    call(os.path.join(models_root_dir, "model2/with/slashes")),
+                    call(os.path.join(models_root_dir, "best_model")),
                 ]
             )
 
@@ -394,8 +397,12 @@ def test__get_full_model_name(self):
         # given:
         SimpleCheckpoint = namedtuple("SimpleCheckpoint", ["dirpath"])
         test_input_data = [
-            ("key.ext", "foo/bar/key.ext", SimpleCheckpoint(dirpath="foo/bar")),
-            ("key/in/parts.ext", "foo/bar/key/in/parts.ext", SimpleCheckpoint(dirpath="foo/bar")),
+            ("key.ext", os.path.join("foo", "bar", "key.ext"), SimpleCheckpoint(dirpath=os.path.join("foo", "bar"))),
+            (
+                "key/in/parts.ext",
+                os.path.join("foo", "bar", "key/in/parts.ext"),
+                SimpleCheckpoint(dirpath=os.path.join("foo", "bar")),
+            ),
         ]
 
         # expect: