fix: deepcopy error from baseline_model in pairwiseMetric

PiperOrigin-RevId: 693800802

tests/unit/vertexai/test_evaluation.py

@@ -317,6 +317,20 @@
         )
     ),
 )
+_MOCK_PAIRWISE_RESULT = (
+    gapic_evaluation_service_types.EvaluateInstancesResponse(
+        pairwise_metric_result=gapic_evaluation_service_types.PairwiseMetricResult(
+            pairwise_choice=gapic_evaluation_service_types.PairwiseChoice.BASELINE,
+            explanation="explanation",
+        )
+    ),
+    gapic_evaluation_service_types.EvaluateInstancesResponse(
+        pairwise_metric_result=gapic_evaluation_service_types.PairwiseMetricResult(
+            pairwise_choice=gapic_evaluation_service_types.PairwiseChoice.BASELINE,
+            explanation="explanation",
+        )
+    ),
+)
 _MOCK_SUMMARIZATION_QUALITY_RESULT = (
     gapic_evaluation_service_types.EvaluateInstancesResponse(
         pointwise_metric_result=gapic_evaluation_service_types.PointwiseMetricResult(
@@ -1216,6 +1230,40 @@ def test_evaluate_baseline_response_column_and_baseline_model_provided(self):
             test_eval_task.evaluate(model=mock.MagicMock())
         _TEST_PAIRWISE_METRIC._baseline_model = None
 
+    def test_evaluate_baseline_model_provided_but_no_baseline_response_column(self):
+        mock_baseline_model = mock.create_autospec(
+            generative_models.GenerativeModel, instance=True
+        )
+        mock_baseline_model.generate_content.return_value = (
+            _MOCK_MODEL_INFERENCE_RESPONSE
+        )
+        mock_baseline_model._model_name = "publishers/google/model/gemini-pro"
+        _TEST_PAIRWISE_METRIC._baseline_model = mock_baseline_model
+
+        mock_candidate_model = mock.create_autospec(
+            generative_models.GenerativeModel, instance=True
+        )
+        mock_candidate_model.generate_content.return_value = (
+            _MOCK_MODEL_INFERENCE_RESPONSE
+        )
+        mock_candidate_model._model_name = "publishers/google/model/gemini-1.0-pro"
+        mock_metric_results = _MOCK_PAIRWISE_RESULT
+        eval_dataset = _TEST_EVAL_DATASET_WITHOUT_RESPONSE.copy(deep=True)
+        test_eval_task = EvalTask(
+            dataset=eval_dataset,
+            metrics=[_TEST_PAIRWISE_METRIC],
+        )
+        with mock.patch.object(
+            target=gapic_evaluation_services.EvaluationServiceClient,
+            attribute="evaluate_instances",
+            side_effect=mock_metric_results,
+        ):
+            test_result = test_eval_task.evaluate(
+                model=mock_candidate_model,
+            )
+        _TEST_PAIRWISE_METRIC._baseline_model = None
+        assert test_result.summary_metrics["row_count"] == 2
+
     def test_evaluate_response_column_and_model_not_provided(self):
         test_eval_task = EvalTask(
             dataset=_TEST_EVAL_DATASET_SINGLE,

vertexai/evaluation/_evaluation.py

@@ -856,15 +856,28 @@ def evaluate(
     """
     _validate_metrics(metrics)
     metrics = _convert_metric_prompt_template_example(metrics)
-
+    copied_metrics = []
+    for metric in metrics:
+        if isinstance(metric, pairwise_metric.PairwiseMetric):
+            copied_metrics.append(
+                pairwise_metric.PairwiseMetric(
+                    metric=metric.metric_name,
+                    metric_prompt_template=metric.metric_prompt_template,
+                    baseline_model=metric.baseline_model,
+                )
+            )
+        else:
+            copied_metrics.append(copy.deepcopy(metric))
     evaluation_run_config = evaluation_base.EvaluationRunConfig(
         dataset=dataset.copy(deep=True),
-        metrics=copy.deepcopy(metrics),
+        metrics=copied_metrics,
         metric_column_mapping=copy.deepcopy(metric_column_mapping),
         client=utils.create_evaluation_service_client(),
-        evaluation_service_qps=evaluation_service_qps
-        if evaluation_service_qps
-        else constants.QuotaLimit.EVAL_SERVICE_QPS,
+        evaluation_service_qps=(
+            evaluation_service_qps
+            if evaluation_service_qps
+            else constants.QuotaLimit.EVAL_SERVICE_QPS
+        ),
         retry_timeout=retry_timeout,
     )