Add remove to vocabulary interfaces

benchmarks/bench_regex_guide.py

@@ -38,7 +38,7 @@ def time_regex_to_guide_parallel(self, pattern_name):
     def time_regex_to_guide_parallel_with_custom_switch_interval(self, pattern_name):
         # Note: after moving to full rust implementation for index and guide creation, this experiment
         # is no longer shows the drastic difference as it once showed when python was heavily involved,
-        # due to on average speedup ~100 times.
+        # due to speedup up to ~100 times.
 
         # This test is to show, that if GIL's switch interval is set to be longer, then the parallel
         # test's runtime on physical cores will be much closer to the one-threaded case.

python/outlines_core/fsm/outlines_core_rs.pyi

@@ -53,6 +53,9 @@ class Vocabulary:
     def insert(self, token: Union[str, bytes], token_id: int):
         """Inserts new token with token_id or extends list of token_ids if token already present."""
         ...
+    def remove(self, token: Union[str, bytes]):
+        """Removes a token from vocabulary."""
+        ...
     def get_eos_token_id(self) -> Optional[int]:
         """Gets the end of sentence token id."""
         ...

src/python_bindings/mod.rs

@@ -259,6 +259,21 @@ impl PyVocabulary {
         )))
     }
 
+    fn remove(&mut self, py: Python<'_>, token: Py<PyAny>) -> PyResult<()> {
+        if let Ok(t) = token.extract::<String>(py) {
+            self.0.remove(t);
+            return Ok(());
+        }
+        if let Ok(t) = token.extract::<Token>(py) {
+            self.0.remove(t);
+            return Ok(());
+        }
+        Err(PyErr::new::<pyo3::exceptions::PyTypeError, _>(format!(
+            "Expected a token of type str or bytes, got {:?}",
+            type_name!(token)
+        )))
+    }
+
     fn get_eos_token_id(&self) -> TokenId {
         self.0.eos_token_id()
     }

src/vocabulary/mod.rs

@@ -57,6 +57,12 @@ impl Vocabulary {
         Ok(())
     }
 
+    /// Removes a token from the vocabulary.
+    pub fn remove(&mut self, token: impl Into<Token>) {
+        let token = token.into();
+        self.tokens.remove(&token);
+    }
+
     /// Creates the vocabulary of pre-trained model from Hugging Face Hub.
     pub fn from_pretrained(
         model: &str,
@@ -251,6 +257,15 @@ mod tests {
             .try_insert("six".to_string(), 6)
             .expect("Insert failed");
         assert_eq!(vocabulary.token_to_ids("six"), Some(&vec![6]));
+
+        vocabulary.remove(b"four");
+        assert_eq!(vocabulary.token_to_ids("four"), None);
+
+        vocabulary.remove(b"five".to_vec());
+        assert_eq!(vocabulary.token_to_ids("five"), None);
+
+        vocabulary.remove("six".to_string());
+        assert_eq!(vocabulary.token_to_ids("six"), None);
     }
 
     #[test]

tests/fsm/test_vocabulary.py

@@ -12,12 +12,8 @@ def vocabulary():
     return Vocabulary(eos_token_id, tokens)
 
 
-def test_basic_vocabulary_interface():
-    eos_token_id = 3
-    tokens = {"1": [1], "a": [2]}
-    vocabulary = Vocabulary(eos_token_id, tokens)
-
-    assert vocabulary.get_eos_token_id() == eos_token_id
+def test_basic_vocabulary_interface(vocabulary):
+    assert vocabulary.get_eos_token_id() == 3
     assert vocabulary.get("1") == vocabulary.get(b"1") == [1]
     assert len(vocabulary) == 2
 
@@ -29,6 +25,17 @@ def test_basic_vocabulary_interface():
     assert vocabulary.get("b") == vocabulary.get(b"b") == [4, 5]
     assert len(vocabulary) == 3
 
+    vocabulary.remove("b")
+    assert vocabulary.get("b") is None
+
+    # second remove doesn't fail too
+    vocabulary.remove("b")
+    assert vocabulary.get("b") is None
+
+    assert vocabulary.get("a") == [2]
+    vocabulary.remove(b"a")
+    assert vocabulary.get("a") is None
+
 
 def test_string_and_bytes_as_tokens():
     eos_token_id = 3