fix: Fix device state restoration in NamedEntityExtractor and add release …

e2e/pipelines/test_named_entity_extractor.py

@@ -10,6 +10,7 @@
 import sys
 
 import pytest
+from thinc.api import NumpyOps, get_current_ops, set_current_ops
 
 from haystack import Document, Pipeline
 from haystack.components.extractors import (
@@ -132,3 +133,34 @@ def _check_predictions(predicted, expected) -> None:
             assert a.entity == b.entity
             assert a.start == b.start
             assert a.end == b.end
+
+class TestNamedEntityExtractorDeviceRestoration:
+    def test_spacy_backend_restores_device_state(self):
+        """
+        Verify that NamedEntityExtractor (spaCy) restores the previous Thinc Ops state
+        after the component runs.
+        """
+        # 1. Setup a custom state
+        custom_ops = NumpyOps()
+        setattr(custom_ops, "owner", "test_marker")
+        set_current_ops(custom_ops)
+
+        try:
+            # 2. Initialize and run (triggering the context manager)
+            extractor = NamedEntityExtractor(backend="spacy", model="en_core_web_sm")
+
+            # Since _SpacyBackend is private, we access it via getattr to avoid IDE warnings
+            backend = getattr(extractor, "_backend")
+            select_device_method = getattr(backend, "_select_device")
+
+            with select_device_method():
+                # Inside the context, the state might change
+                pass
+
+            # 3. Verify state is restored
+            final_ops = get_current_ops()
+            assert getattr(final_ops, "owner", None) == "test_marker"
+
+        finally:
+            # Clean up global state
+            set_current_ops(NumpyOps())

haystack/components/extractors/named_entity_extractor.py

@@ -22,6 +22,7 @@
 with LazyImport(message="Run 'pip install spacy'") as spacy_import:
     import spacy
     from spacy import Language as SpacyPipeline
+    from thinc.api import get_current_ops, set_current_ops
 
 
 class NamedEntityExtractorBackend(Enum):
@@ -492,17 +493,11 @@ def _select_device(self) -> Iterator[None]:
         """
         Context manager used to run spaCy models on a specific GPU in a scoped manner.
         """
-
-        # TODO: This won't restore the active device.
-        # Since there are no opaque API functions to determine
-        # the active device in spaCy/Thinc, we can't do much
-        # about it as a consumer unless we start poking into their
-        # internals.
         device_id = self._device.to_spacy()
+        previous_ops = get_current_ops()
         try:
             if device_id >= 0:
                 spacy.require_gpu(device_id)
             yield
         finally:
-            if device_id >= 0:
-                spacy.require_cpu()
+            set_current_ops(previous_ops)

releasenotes/notes/Restore-Thinc-Ops-state-in-NamedEntityExtractor-spaCy-backend-44be660745d5c3b4.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixed a bug in ``NamedEntityExtractor`` where the spaCy/Thinc device state was not correctly 
+    restored after execution, potentially affecting the device configuration of other spaCy 
+    components in the same process.