Bug fix in explorer.eval

[chenyushuo]

Description

As title says.

Checklist

Please check the following items before code is ready to be reviewed.

• Code has passed all tests
• Docstrings have been added/updated in Google Style
• Documentation has been updated
• Code is ready for review

[chenyushuo]

/run-unittest

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Pending ⏳	Other ❓	Flaky 🍂	Duration ⏱️
1	1	0	0	0	0	0	8ms

Failed Tests

No failed tests ✨

Flaky Tests

No flaky tests ✨

Skipped

No skipped tests ✨

Tests

Test Name	Status	Flaky	Duration
tests/explorer/runner_pool_test.py::RunnerPoolTest::test_runner_pool_with_auxiliary_models	✅		4ms

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[chenyushuo]

/run-unittest

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Pending ⏳	Other ❓	Flaky 🍂	Duration ⏱️
39	39	0	0	0	0	0	1.1s

Failed Tests

No failed tests ✨

Flaky Tests

No flaky tests ✨

Skipped

No skipped tests ✨

Tests

Test Name	Status	Flaky	Duration
tests/algorithm/policy_loss_test.py::VerlPolicyLossTest::test_dpo_policy_loss	✅		1ms
tests/algorithm/policy_loss_test.py::VerlPolicyLossTest::test_mix_policy_loss	✅		1ms
tests/algorithm/policy_loss_test.py::VerlPolicyLossTest::test_opmd_policy_loss	✅		1ms
tests/algorithm/policy_loss_test.py::VerlPolicyLossTest::test_ppo_policy_loss	✅		1ms
tests/algorithm/policy_loss_test.py::VerlPolicyLossTest::test_sft_policy_loss	✅		1ms
tests/buffer/file_test.py::TestFileBuffer::test_file_buffer	✅		3ms
tests/buffer/file_test.py::TestFileBuffer::test_file_reader	✅		1ms
tests/buffer/file_test.py::TestFileBuffer::test_file_writer	✅		1ms
tests/buffer/queue_test.py::TestQueueBuffer::test_queue_buffer	✅		2ms
tests/buffer/sql_test.py::TestSQLBuffer::test_create_sql_buffer	✅		3ms
tests/common/config_test.py::TestConfig::test_all_examples_are_valid	✅		1ms
tests/common/config_test.py::TestConfig::test_load_default_config	✅		5ms
tests/common/experience_test.py::TestExperienceConversion::test_batch_conversion	✅		1ms
tests/common/experience_test.py::TestExperienceConversion::test_experience_model_experience_conversion	✅		1ms
tests/common/vllm_test.py::TestModelWrapperSyncV0::test_generate	✅		41ms
tests/common/vllm_test.py::TestModelWrapperAsyncV0::test_generate	✅		40ms
tests/common/vllm_test.py::TestModelWrapperAsyncTPV0::test_generate	✅		51ms
tests/common/vllm_test.py::TestModelWrapperAsyncTPV1::test_generate	✅		52ms
tests/common/vllm_test.py::TestModelWrapperAsyncV1::test_generate	✅		38ms
tests/common/vllm_test.py::TestAPIServer::test_api	✅		24ms
tests/common/vllm_test.py::TestTokenizer::test_assistant_token_mask	✅		1ms
tests/explorer/explorer_test.py::BaseExplorerCase::test_explorer	✅		1ms
tests/explorer/explorer_test.py::TestExplorerCountdownEval::test_explorer	✅		114ms
tests/explorer/explorer_test.py::TestExplorerCountdownNoEval::test_explorer	✅		116ms
tests/explorer/runner_pool_test.py::RunnerPoolTest::test_runner_pool	✅		22ms
tests/explorer/runner_pool_test.py::RunnerPoolTest::test_runner_pool_with_auxiliary_models	✅		4ms
tests/explorer/workflow_test.py::WorkflowTest::test_gsm8k_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_boxed_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_complex_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_fraction_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_math_workflow	✅		1ms
tests/explorer/workflow_test.py::WorkflowTest::test_workflow_resettable	✅		1ms
tests/trainer/trainer_test.py::BaseTrainerCase::test_trainer	✅		1ms
tests/trainer/trainer_test.py::TestTrainerCountdown::test_trainer	✅		277ms
tests/trainer/trainer_test.py::TestStepAheadAsyncRL::test_trainer	✅		96ms
tests/trainer/trainer_test.py::TestTrainerGSM8K::test_trainer	✅		67ms
tests/trainer/trainer_test.py::TestTrainerSFTWarmupGSM8K::test_trainer	✅		70ms
tests/trainer/trainer_test.py::TestTrainerDPO::test_trainer	✅		53ms
tests/utils/plugin_test.py::TestPluginLoader::test_load_plugins	✅		4ms

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