Update GuardrailSequence to be compatible with LangChain 0.0.353.

Author: qiuosier

ads/llm/chain.py

@@ -261,12 +261,8 @@ def load(cls, chain_dict: dict, **kwargs) -> "GuardrailSequence":
         from ads.llm.serialize import load
 
         chain_spec = chain_dict[SPEC_CHAIN]
-        chain = cls()
-        for config in chain_spec:
-            step = load(config, **kwargs)
-            # Chain the step
-            chain |= step
-        return chain
+        steps = [load(config, **kwargs) for config in chain_spec]
+        return cls(*steps)
 
     def __str__(self) -> str:
         return "\n".join([str(step.__class__) for step in self.steps])

tests/unitary/with_extras/langchain/test_guardrails.py

@@ -175,10 +175,6 @@ def test_fn(chain: GuardrailSequence):
 
         self.assert_before_and_after_serialization(test_fn, chain)
 
-    def test_empty_sequence(self):
-        """Tests empty sequence."""
-        seq = GuardrailSequence()
-        self.assertEqual(seq.steps, [])
 
     def test_save_to_file(self):
         """Tests saving to file."""