Don't add duplicate patterns all the time in EntityRuler (fix #8216) (#8246)

* Don't add duplicate patterns (fix #8216)

* Refactor EntityRuler init

This simplifies the EntityRuler init code. This is helpful as prep for
allowing the EntityRuler to reset itself.

* Make EntityRuler.clear reset matchers

Includes a new test for this.

* Tidy PhraseMatcher instantiation

Since the attr can be None safely now, the guard if is no longer
required here.

Also renamed the `_validate` attr. Maybe it's not needed?

* Fix NER test

* Add test to make sure patterns aren't increasing

* Move test to regression tests

spacy/matcher/phrasematcher.pyx

@@ -50,6 +50,8 @@ cdef class PhraseMatcher:
         if isinstance(attr, (int, long)):
             self.attr = attr
         else:
+            if attr is None:
+                attr = "ORTH"
             attr = attr.upper()
             if attr == "TEXT":
                 attr = "ORTH"

spacy/pipeline/entityruler.py

@@ -102,17 +102,12 @@ class EntityRuler(Pipe):
         self.overwrite = overwrite_ents
         self.token_patterns = defaultdict(list)
         self.phrase_patterns = defaultdict(list)
+        self._validate = validate
         self.matcher = Matcher(nlp.vocab, validate=validate)
-        if phrase_matcher_attr is not None:
-            if phrase_matcher_attr.upper() == "TEXT":
-                phrase_matcher_attr = "ORTH"
         self.phrase_matcher_attr = phrase_matcher_attr
         self.phrase_matcher = PhraseMatcher(
             nlp.vocab, attr=self.phrase_matcher_attr, validate=validate
         )
-        else:
-            self.phrase_matcher_attr = None
-            self.phrase_matcher = PhraseMatcher(nlp.vocab, validate=validate)
         self.ent_id_sep = ent_id_sep
         self._ent_ids = defaultdict(dict)
         if patterns is not None:
@@ -317,20 +312,22 @@ class EntityRuler(Pipe):
                 pattern = entry["pattern"]
                 if isinstance(pattern, Doc):
                     self.phrase_patterns[label].append(pattern)
+                    self.phrase_matcher.add(label, [pattern])
                 elif isinstance(pattern, list):
                     self.token_patterns[label].append(pattern)
+                    self.matcher.add(label, [pattern])
                 else:
                     raise ValueError(Errors.E097.format(pattern=pattern))
-            for label, patterns in self.token_patterns.items():
-                self.matcher.add(label, patterns)
-            for label, patterns in self.phrase_patterns.items():
-                self.phrase_matcher.add(label, patterns)
 
     def clear(self) -> None:
         """Reset all patterns."""
         self.token_patterns = defaultdict(list)
         self.phrase_patterns = defaultdict(list)
         self._ent_ids = defaultdict(dict)
+        self.matcher = Matcher(self.nlp.vocab, validate=self._validate)
+        self.phrase_matcher = PhraseMatcher(
+            self.nlp.vocab, attr=self.phrase_matcher_attr, validate=self._validate
+        )
 
     def _require_patterns(self) -> None:
         """Raise a warning if this component has no patterns defined."""
@@ -381,7 +378,6 @@ class EntityRuler(Pipe):
             self.add_patterns(cfg.get("patterns", cfg))
             self.overwrite = cfg.get("overwrite", False)
             self.phrase_matcher_attr = cfg.get("phrase_matcher_attr", None)
-            if self.phrase_matcher_attr is not None:
             self.phrase_matcher = PhraseMatcher(
                 self.nlp.vocab, attr=self.phrase_matcher_attr
             )
@@ -435,7 +431,6 @@ class EntityRuler(Pipe):
             self.phrase_matcher_attr = cfg.get("phrase_matcher_attr")
             self.ent_id_sep = cfg.get("ent_id_sep", DEFAULT_ENT_ID_SEP)
 
-            if self.phrase_matcher_attr is not None:
             self.phrase_matcher = PhraseMatcher(
                 self.nlp.vocab, attr=self.phrase_matcher_attr
             )

spacy/tests/parser/test_ner.py

@@ -252,12 +252,12 @@ def test_ruler_before_ner():
     # 1 : Entity Ruler - should set "this" to B and everything else to empty
     patterns = [{"label": "THING", "pattern": "This"}]
     ruler = nlp.add_pipe("entity_ruler")
-    ruler.add_patterns(patterns)
 
     # 2: untrained NER - should set everything else to O
     untrained_ner = nlp.add_pipe("ner")
     untrained_ner.add_label("MY_LABEL")
     nlp.initialize()
+    ruler.add_patterns(patterns)
     doc = nlp("This is Antti Korhonen speaking in Finland")
     expected_iobs = ["B", "O", "O", "O", "O", "O", "O"]
     expected_types = ["THING", "", "", "", "", "", ""]

spacy/tests/pipeline/test_entity_ruler.py

@@ -89,6 +89,19 @@ def test_entity_ruler_init_clear(nlp, patterns):
     assert len(ruler.labels) == 0
 
 
+def test_entity_ruler_clear(nlp, patterns):
+    """Test that initialization clears patterns."""
+    ruler = nlp.add_pipe("entity_ruler")
+    ruler.add_patterns(patterns)
+    assert len(ruler.labels) == 4
+    doc = nlp("hello world")
+    assert len(doc.ents) == 1
+    ruler.clear()
+    assert len(ruler.labels) == 0
+    doc = nlp("hello world")
+    assert len(doc.ents) == 0
+
+
 def test_entity_ruler_existing(nlp, patterns):
     ruler = nlp.add_pipe("entity_ruler")
     ruler.add_patterns(patterns)

spacy/tests/regression/test_issue8216.py

@@ -0,0 +1,34 @@
+import pytest
+
+from spacy import registry
+from spacy.language import Language
+from spacy.pipeline import EntityRuler
+
+
+@pytest.fixture
+def nlp():
+    return Language()
+
+
+@pytest.fixture
+@registry.misc("entity_ruler_patterns")
+def patterns():
+    return [
+        {"label": "HELLO", "pattern": "hello world"},
+        {"label": "BYE", "pattern": [{"LOWER": "bye"}, {"LOWER": "bye"}]},
+        {"label": "HELLO", "pattern": [{"ORTH": "HELLO"}]},
+        {"label": "COMPLEX", "pattern": [{"ORTH": "foo", "OP": "*"}]},
+        {"label": "TECH_ORG", "pattern": "Apple", "id": "a1"},
+        {"label": "TECH_ORG", "pattern": "Microsoft", "id": "a2"},
+    ]
+
+
+def test_entity_ruler_fix8216(nlp, patterns):
+    """Test that patterns don't get added excessively."""
+    ruler = nlp.add_pipe("entity_ruler", config={"validate": True})
+    ruler.add_patterns(patterns)
+    pattern_count = sum(len(mm) for mm in ruler.matcher._patterns.values())
+    assert pattern_count > 0
+    ruler.add_patterns([])
+    after_count = sum(len(mm) for mm in ruler.matcher._patterns.values())
+    assert after_count == pattern_count