perf: optimize dictionary items by providing function to check for pr…

…esence of label in constant time, rather than requiring the creation of a list to be checked. update slow uses of get_items() to use this new function.

flair/data.py

@@ -122,18 +122,18 @@ def get_idx_for_items(self, items: list[str]) -> list[int]:
         return list(results)
 
     def get_items(self) -> list[str]:
-        items = []
-        for item in self.idx2item:
-            items.append(item.decode("UTF-8"))
-        return items
+        return [item.decode("UTF-8") for item in self.idx2item]
 
     def __len__(self) -> int:
         return len(self.idx2item)
 
-    def get_item_for_index(self, idx):
+    def get_item_for_index(self, idx: int) -> str:
         return self.idx2item[idx].decode("UTF-8")
 
-    def set_start_stop_tags(self):
+    def has_item(self, item: str) -> bool:
+        return item.encode("utf-8") in self.item2idx
+
+    def set_start_stop_tags(self) -> None:
         self.add_item("<START>")
         self.add_item("<STOP>")
 
@@ -1659,7 +1659,7 @@ def make_label_dictionary(
                 unked_count += count
 
         if len(label_dictionary.idx2item) == 0 or (
-            len(label_dictionary.idx2item) == 1 and "<unk>" in label_dictionary.get_items()
+            len(label_dictionary.idx2item) == 1 and label_dictionary.has_item("<unk>")
         ):
             log.error(f"ERROR: You specified label_type='{label_type}' which is not in this dataset!")
             contained_labels = ", ".join(

flair/models/lemmatizer_model.py

@@ -491,7 +491,7 @@ def predict(
 
                     for t_id, token in enumerate(tokens_in_batch):
                         predicted_lemma = "".join(
-                            self.char_dictionary.get_item_for_index(idx) if idx != self.end_index else ""
+                            self.char_dictionary.get_item_for_index(int(idx)) if idx != self.end_index else ""
                             for idx in predicted[t_id]
                         )
                         token.set_label(typename=label_name, value=predicted_lemma)

flair/nn/model.py

@@ -877,9 +877,7 @@ def predict(
                         filtered_indices = []
                         has_unknown_label = False
                         for idx, dp in enumerate(data_points):
-                            if all(
-                                label in self.label_dictionary.get_items() for label in self._get_label_of_datapoint(dp)
-                            ):
+                            if all(self.label_dictionary.has_item(label) for label in self._get_label_of_datapoint(dp)):
                                 filtered_indices.append(idx)
                             else:
                                 has_unknown_label = True

tests/test_corpus_dictionary.py

@@ -110,9 +110,9 @@ def test_tagged_corpus_make_vocab_dictionary():
     vocab = corpus.make_vocab_dictionary(max_tokens=2, min_freq=-1)
 
     assert len(vocab) == 3
-    assert "<unk>" in vocab.get_items()
-    assert "training" in vocab.get_items()
-    assert "." in vocab.get_items()
+    assert vocab.has_item("<unk>")
+    assert vocab.has_item("training")
+    assert vocab.has_item(".")
 
     vocab = corpus.make_vocab_dictionary(max_tokens=-1, min_freq=-1)
 
@@ -121,9 +121,9 @@ def test_tagged_corpus_make_vocab_dictionary():
     vocab = corpus.make_vocab_dictionary(max_tokens=-1, min_freq=2)
 
     assert len(vocab) == 3
-    assert "<unk>" in vocab.get_items()
-    assert "training" in vocab.get_items()
-    assert "." in vocab.get_items()
+    assert vocab.has_item("<unk>")
+    assert vocab.has_item("training")
+    assert vocab.has_item(".")
 
 
 def test_label_set_confidence():
@@ -153,9 +153,9 @@ def test_tagged_corpus_make_label_dictionary():
     label_dict = corpus.make_label_dictionary("label", add_unk=True)
 
     assert len(label_dict) == 3
-    assert "<unk>" in label_dict.get_items()
-    assert "class_1" in label_dict.get_items()
-    assert "class_2" in label_dict.get_items()
+    assert label_dict.has_item("<unk>")
+    assert label_dict.has_item("class_1")
+    assert label_dict.has_item("class_2")
 
     with pytest.warns(DeprecationWarning):  # test to make sure the warning comes, but function works
         corpus.make_tag_dictionary("label")