Implementation:Tensorflow Serving Multi Inference Helper Test

Knowledge Sources	Tensorflow_Serving
Domains	Testing, Inference
Last Updated	2026-02-13 00:00 GMT

Overview

Test suite validating the multi-inference helper which runs multiple inference tasks through ServerCore.

Description

This test file validates RunMultiInferenceWithServerCore, the helper function that orchestrates multiple inference requests (classification and regression) via a ServerCore instance. The test fixture is a typed test suite parameterized on TF1 vs TF2 model types using the half_plus_two SavedModel. The fixture sets up a complete ServerCore with an AvailabilityPreservingPolicy and tests various combinations of valid and invalid multi-inference requests.

Key areas tested include:

• Missing input validation
• Undefined and duplicate signature detection
• Inconsistent model specs across tasks
• Unsupported signature types
• Valid single and multiple regression signatures
• Mixed regression and classification signatures
• Model spec version override
• Thread pool options propagation

Usage

Run these tests to validate changes to the multi-inference helper path that dispatches inference tasks through ServerCore.

Code Reference

Source Location

• Repository: Tensorflow_Serving
• File: tensorflow_serving/servables/tensorflow/multi_inference_helper_test.cc
• Lines: 1-375

Test Fixture

template <typename T>
class MultiInferenceTest : public ::testing::Test {
 public:
  static void SetUpTestSuite() {
    SetSignatureMethodNameCheckFeature(UseTf1Model());
    TF_ASSERT_OK(CreateServerCore(&server_core_));
  }
  static void TearDownTestSuite() { server_core_.reset(); }
 protected:
  static absl::Status CreateServerCore(
      std::unique_ptr<ServerCore>* server_core);
  static bool UseTf1Model() { return std::is_same<T, tf1_model_t>::value; }
  ServerCore* GetServerCore() { return this->server_core_.get(); }
 private:
  static std::unique_ptr<ServerCore> server_core_;
};

TYPED_TEST_SUITE_P(MultiInferenceTest);

Build Target

bazel test //tensorflow_serving/servables/tensorflow:multi_inference_helper_test

Test Coverage

Key Test Cases

Test Name	Category	Description
MissingInputTest	Validation	Tests error when input is empty
UndefinedSignatureTest	Validation	Tests error on non-existent signature name
InconsistentModelSpecsInRequestTest	Validation	Tests error when tasks reference different models
EvaluateDuplicateSignaturesTest	Validation	Tests error when duplicate signatures are used
UsupportedSignatureTypeTest	Validation	Tests error on unsupported inference method type
ValidSingleSignatureTest	Integration	Tests successful single regression signature
MultipleValidRegressSignaturesTest	Integration	Tests successful multiple regression signatures
RegressAndClassifySignaturesTest	Integration	Tests mixed regression and classification in one request
ModelSpecOverride	Integration	Tests model spec version override in response
ThreadPoolOptions	Integration	Tests thread pool options are propagated correctly

Usage Examples

Test Pattern

TYPED_TEST_P(MultiInferenceTest, ValidSingleSignatureTest) {
  MultiInferenceRequest request;
  AddInput({{"x", 2}}, &request);
  PopulateTask("regress_x_to_y", kRegressMethodName, -1, request.add_tasks());

  MultiInferenceResponse response;
  TF_ASSERT_OK(RunMultiInferenceWithServerCore(
      RunOptions(), this->GetServerCore(),
      thread::ThreadPoolOptions(), request, &response));
  // Validate response contains expected regression result
}

Related Pages

• Implementation:Tensorflow_Serving_Multi_Inference_Test