fix: make model field optional in LegacyLlmAsAJudgeEvaluator [AE-1306] (#1488)

Author: ameyjain

packages/uipath/src/uipath/eval/evaluators/legacy_context_precision_evaluator.py

@@ -4,6 +4,8 @@
 import json
 from typing import Any, Optional
 
+from pydantic import Field
+
 from uipath.platform import UiPath
 from uipath.platform.chat import UiPathLlmChatService
 
@@ -99,7 +101,7 @@ class LegacyContextPrecisionEvaluator(
     The final score is the mean of all chunk relevancy scores (normalized to 0-1).
     """
 
-    model: str
+    model: str = Field(default="same-as-agent")
     query_placeholder: str = "{{Query}}"
     chunks_placeholder: str = "{{Chunks}}"
     llm: Optional[UiPathLlmChatService] = None

packages/uipath/src/uipath/eval/evaluators/legacy_faithfulness_evaluator.py

@@ -3,6 +3,8 @@
 import json
 from typing import Any, Optional
 
+from pydantic import Field
+
 from uipath.platform import UiPath
 from uipath.platform.chat import UiPathLlmChatService
 
@@ -39,7 +41,7 @@ class LegacyFaithfulnessEvaluator(
     The final score is the percentage of claims that are grounded.
     """
 
-    model: str
+    model: str = Field(default="same-as-agent")
     llm: Optional[UiPathLlmChatService] = None
 
     def model_post_init(self, __context: Any):

packages/uipath/src/uipath/eval/evaluators/legacy_llm_as_judge_evaluator.py

@@ -3,7 +3,7 @@
 import logging
 from typing import Any, Optional
 
-from pydantic import field_validator
+from pydantic import Field, field_validator
 
 from uipath.platform import UiPath
 from uipath.platform.chat import UiPathLlmChatService
@@ -41,7 +41,7 @@ class LegacyLlmAsAJudgeEvaluator(BaseLegacyEvaluator[LegacyLlmAsAJudgeEvaluatorC
     """Legacy evaluator that uses an LLM to judge the quality of agent output."""
 
     prompt: str
-    model: str
+    model: str = Field(default="same-as-agent")
     actual_output_placeholder: str = "{{ActualOutput}}"
     expected_output_placeholder: str = "{{ExpectedOutput}}"
     llm: Optional[UiPathLlmChatService] = None

packages/uipath/src/uipath/eval/evaluators/legacy_trajectory_evaluator.py

@@ -4,7 +4,7 @@
 from typing import Any, Optional
 
 from opentelemetry.sdk.trace import ReadableSpan
-from pydantic import field_validator
+from pydantic import Field, field_validator
 
 from uipath.platform import UiPath
 from uipath.platform.chat import UiPathLlmChatService
@@ -42,7 +42,7 @@ class LegacyTrajectoryEvaluator(BaseLegacyEvaluator[LegacyTrajectoryEvaluatorCon
     """Legacy evaluator that analyzes the trajectory/path taken to reach outputs."""
 
     prompt: str
-    model: str
+    model: str = Field(default="same-as-agent")
     expected_agent_behavior_placeholder: str = "{{ExpectedAgentBehavior}}"
     agent_run_history_placeholder: str = "{{AgentRunHistory}}"
     llm: Optional[UiPathLlmChatService] = None