chore: import upstream snapshot with attribution

python/ray/train/tests/dummy_preprocessor.py

@@ -0,0 +1,29 @@
+import uuid
+
+from ray.data.preprocessor import Preprocessor
+
+
+class DummyPreprocessor(Preprocessor):
+    _is_fittable = False
+
+    def __init__(self, transform=None):
+        self.id = uuid.uuid4()
+
+        if transform is None:
+            self.transform = lambda b: b
+        else:
+            self.transform = transform
+
+    def transform_batch(self, batch):
+        self._batch_transformed = True
+        return self.transform(batch)
+
+    def _transform_pandas(self, df):
+        return df
+
+    @property
+    def has_preprocessed(self):
+        return hasattr(self, "_batch_transformed")
+
+    def __eq__(self, other_preprocessor):
+        return self.id == other_preprocessor.id