feat: Added support for InOrder and AnyOrder match in ToolTrajectoryAvgScore Metric

Co-authored-by: Ankur Sharma <ankusharma@google.com>
PiperOrigin-RevId: 831413968

Author: ankursharmas

src/google/adk/evaluation/eval_metrics.py

@@ -150,6 +150,76 @@ class HallucinationsCriterion(BaseCriterion):
   )
 
 
+class ToolTrajectoryCriterion(BaseCriterion):
+  """Criterion to use when evaluating agent's tool trajectories with a reference one."""
+
+  class MatchType(Enum):
+    """The type of Match between actual and expected tool call trajectories."""
+
+    EXACT = 0
+    """Requires a perfect match between the actual and expected tool calls."""
+
+    IN_ORDER = 1
+    """Requires the actual tool calls to be in the same order as expected tools,
+    with allowance for extra tool calls to have happened.
+
+    This criteria is useful in assuring if certain key actions/tool calls
+    occur and in certain order, leaving some scope for other tools calls to
+    happen as well.
+
+    Example 1: Set of actual vs expected tool calls that satisfies the criteria:
+
+      Expected tools calls: [T1, T2, T3]
+      Actual tool calls: [T1, T1.1, T2, T2.1, T2.2, T3, T3.1]
+
+      This satisfies, as the tools T1, T2 and T3 happened in the "Actual" and in
+      the same order.
+
+    Example 2: Set of actual vs expected tool calls that don't satisfy the
+    criteria:
+
+      Expected tools calls: [T1, T2, T3, T4]
+      Actual tool calls: [T1, T1.1, T2, T2.1, T2.2, T3, T3.1]
+
+      While the tool calls T1, T2 and T3 happened in the "Actual" and in
+      the same order as "Expected", but the the tool calls T4 is missing.
+    """
+
+    ANY_ORDER = 2
+    """Requires the actual tool calls to be in the any order as expected tools,
+    with allowance for extra tool calls to have happened.
+
+    This criteria is helpful for cases where multiple tool calls about the same
+    concept occur, like your agent issues 5 search queries. You don't really
+    care the order in which the search queries are issues, till they occur.
+
+    Example 1: Set of actual vs expected tool calls that satisfies the criteria:
+
+      Expected tools calls: [T1, T2, T3]
+      Actual tool calls: [T2, T2.1, T1, T1.1, T1.2, T3, T3.1]
+
+      This satisfies, as the tools T1, T2 and T3 happened in the "Actual" and
+      are also present in expected. Note that the order is different.
+
+    Example 2: Set of actual vs expected tool calls that don't satisfy the
+    criteria:
+
+      Expected tools calls: [T1, T2, T3, T4]
+      Actual tool calls: [T1, T1.1, T2, T2.1, T2.2, T3, T3.1]
+
+      While the tool calls T1, T2 and T3 happened in the "Actual" and in
+      the same order as "Expected", but the the tool calls T4 is missing.
+    """
+
+  match_type: MatchType = Field(
+      default=MatchType.EXACT,
+      description=(
+          "The type of Match between actual and expected tool call"
+          " trajectories."
+      ),
+  )
+
+
 class EvalMetric(EvalBaseModel):
   """A metric used to evaluate a particular aspect of an eval case."""
 

src/google/adk/evaluation/trajectory_evaluator.py

@@ -14,9 +14,12 @@
 
 from __future__ import annotations
 
+import logging
+from typing import ClassVar
 from typing import Optional
 
 from google.genai import types as genai_types
+from pydantic import ValidationError
 from typing_extensions import override
 
 from .eval_case import get_all_tool_calls
@@ -26,14 +29,43 @@
 from .eval_metrics import MetricInfo
 from .eval_metrics import MetricValueInfo
 from .eval_metrics import PrebuiltMetrics
+from .eval_metrics import ToolTrajectoryCriterion
 from .evaluator import EvalStatus
 from .evaluator import EvaluationResult
 from .evaluator import Evaluator
 from .evaluator import PerInvocationResult
 
+logger = logging.getLogger("google_adk." + __name__)
+
 
 class TrajectoryEvaluator(Evaluator):
-  """Evaluates tool use trajectories for accuracy."""
+  """Evaluates tool use trajectories for accuracy.
+
+  This evaluator compares the sequence of tools called by the agent against a
+  list of expected calls and computes an average score based on one of the match
+  types: `EXACT`, `IN_ORDER`, or `ANY_ORDER`.
+
+  For each invocation being evaluated, this evaluator compares the list of
+  tool calls produced by the agent with the list of expected tool calls using
+  one of three match types. If the tool calls match based on the selected match
+  type, a score of 1.0 is awarded for that invocation, otherwise the score is
+  0.0. The final value is the average of these scores across all
+  invocations in the eval case.
+
+  The comparison can be done using one of following match types:
+    - `EXACT`: Requires a perfect match between the actual and expected tool
+      calls, with no extra or missing tool calls.
+    - `IN_ORDER`: Requires all tool calls from the expected list to be present
+      in the actual list, in the same order, but allows for other tool calls
+      to appear in between.
+    - `ANY_ORDER`: Requires all tool calls from the expected list to be
+      present in the actual list, in any order, and allows for other tool
+      calls to appear in between.
+  """
+
+  criterion_type: ClassVar[type[ToolTrajectoryCriterion]] = (
+      ToolTrajectoryCriterion
+  )
 
   def __init__(
       self,
@@ -46,10 +78,25 @@ def __init__(
           " specified."
       )
 
-    if eval_metric:
-      threshold = eval_metric.threshold
-
-    self._threshold = threshold
+    if eval_metric and eval_metric.criterion:
+      try:
+        criterion = TrajectoryEvaluator.criterion_type.model_validate(
+            eval_metric.criterion.model_dump()
+        )
+        self._threshold = criterion.threshold
+        self._match_type = criterion.match_type
+      except ValidationError as e:
+        expected_criterion_type_error = ValueError(
+            f"`{eval_metric.metric_name}` metric expects a criterion of type"
+            f" `{TrajectoryEvaluator.criterion_type}`."
+        )
+        raise expected_criterion_type_error from e
+    elif eval_metric:
+      self._threshold = eval_metric.threshold
+      self._match_type = ToolTrajectoryCriterion.MatchType.EXACT
+    else:
+      self._threshold = threshold
+      self._match_type = ToolTrajectoryCriterion.MatchType.EXACT
 
   @staticmethod
   def get_metric_info() -> MetricInfo:
@@ -82,14 +129,7 @@ def evaluate_invocations(
     per_invocation_results = []
 
     for actual, expected in zip(actual_invocations, expected_invocations):
-      actual_tool_uses = get_all_tool_calls(actual.intermediate_data)
-      expected_tool_uses = get_all_tool_calls(expected.intermediate_data)
-
-      tool_use_accuracy = (
-          1.0
-          if self._are_tool_calls_equal(actual_tool_uses, expected_tool_uses)
-          else 0.0
-      )
+      tool_use_accuracy = self._calculate_tool_use_accuracy(actual, expected)
       per_invocation_results.append(
           PerInvocationResult(
               actual_invocation=actual,
@@ -111,11 +151,128 @@ def evaluate_invocations(
 
     return EvaluationResult()
 
-  def _are_tool_calls_equal(
+  def _calculate_tool_use_accuracy(
+      self,
+      actual_invocation: Invocation,
+      expected_invocation: Invocation,
+  ) -> float:
+    """Calculates tool use accuracy for a single invocation."""
+    actual_tool_uses = get_all_tool_calls(actual_invocation.intermediate_data)
+    expected_tool_uses = get_all_tool_calls(
+        expected_invocation.intermediate_data
+    )
+
+    tool_use_match_status = False
+    if self._match_type == ToolTrajectoryCriterion.MatchType.EXACT:
+      tool_use_match_status = self._are_tool_calls_exact_match(
+          actual_tool_uses, expected_tool_uses
+      )
+    elif self._match_type == ToolTrajectoryCriterion.MatchType.IN_ORDER:
+      tool_use_match_status = self._are_tool_calls_in_order_match(
+          actual_tool_uses, expected_tool_uses
+      )
+    elif self._match_type == ToolTrajectoryCriterion.MatchType.ANY_ORDER:
+      tool_use_match_status = self._are_tool_calls_any_order_match(
+          actual_tool_uses, expected_tool_uses
+      )
+    else:
+      raise ValueError(f"Unsupported match type {self._match_type}")
+
+    return 1.0 if tool_use_match_status else 0.0
+
+  def _are_tool_calls_in_order_match(
+      self,
+      actual_tool_calls: list[genai_types.FunctionCall],
+      expected_tool_calls: list[genai_types.FunctionCall],
+  ) -> bool:
+    """Checks if expected tool calls appear in actual tool calls in order.
+
+    This method implements IN_ORDER match type. It allows for additional
+    tool calls in actual_tool_calls, as long as all expected tool calls are
+    present in the same order.
+
+    Args:
+      actual_tool_calls: A list of tool calls that actually happened.
+      expected_tool_calls: A list of tool calls that were expected to happen.
+
+    Returns:
+      True if actual tool calls match expected tool calls in order,
+      False otherwise.
+    """
+    if not expected_tool_calls:
+      return True
+    if not actual_tool_calls and expected_tool_calls:
+      return False
+
+    expected_it = iter(expected_tool_calls)
+    try:
+      current_expected = next(expected_it)
+      for actual in actual_tool_calls:
+        if (
+            actual.name == current_expected.name
+            and actual.args == current_expected.args
+        ):
+          current_expected = next(expected_it)
+    except StopIteration:
+      return True
+
+    return False
+
+  def _are_tool_calls_any_order_match(
       self,
       actual_tool_calls: list[genai_types.FunctionCall],
       expected_tool_calls: list[genai_types.FunctionCall],
   ) -> bool:
+    """Checks if expected tool calls appear in actual tool calls in any order.
+
+    This method implements ANY_ORDER match type. It allows for additional
+    tool calls in actual_tool_calls, as long as all expected tool calls are
+    present.
+
+    Args:
+      actual_tool_calls: A list of tool calls that actually happened.
+      expected_tool_calls: A list of tool calls that were expected to happen.
+
+    Returns:
+      True if actual tool calls contain all expected tool calls,
+      False otherwise.
+    """
+    if not expected_tool_calls:
+      return True
+    if not actual_tool_calls and expected_tool_calls:
+      return False
+
+    actual_tool_calls_copy = list(actual_tool_calls)
+    for expected in expected_tool_calls:
+      found = False
+      for i, actual in enumerate(actual_tool_calls_copy):
+        if actual.name == expected.name and actual.args == expected.args:
+          actual_tool_calls_copy.pop(i)
+          found = True
+          break
+      if not found:
+        return False
+    return True
+
+  def _are_tool_calls_exact_match(
+      self,
+      actual_tool_calls: list[genai_types.FunctionCall],
+      expected_tool_calls: list[genai_types.FunctionCall],
+  ) -> bool:
+    """Checks if actual tool calls exactly match expected tool calls.
+
+    This method implements EXACT match type. It requires that
+    actual_tool_calls and expected_tool_calls have the same tool calls in
+    the same order, with no extra or missing tool calls.
+
+    Args:
+      actual_tool_calls: A list of tool calls that actually happened.
+      expected_tool_calls: A list of tool calls that were expected to happen.
+
+    Returns:
+      True if actual tool calls exactly match expected tool calls,
+      False otherwise.
+    """
     if len(actual_tool_calls) != len(expected_tool_calls):
       return False