[CI] green llama tests (#37244)

* green llama tests

* use cleanup instead

* better test comment; cleanup upgrade

* better test comment; cleanup upgrade

tests/models/gemma/test_modeling_gemma.py

@@ -23,6 +23,7 @@ from packaging import version
 from transformers import AutoModelForCausalLM, AutoTokenizer, GemmaConfig, is_torch_available
 from transformers.generation.configuration_utils import GenerationConfig
 from transformers.testing_utils import (
+    cleanup,
     is_flaky,
     require_bitsandbytes,
     require_flash_attn,
@@ -498,6 +499,10 @@ class GemmaIntegrationTest(unittest.TestCase):
             # 8 is for A100 / A10 and 7 for T4
             cls.cuda_compute_capability_major_version = torch.cuda.get_device_capability()[0]
 
+    def tearDown(self):
+        # See LlamaIntegrationTest.tearDown(). Can be removed once LlamaIntegrationTest.tearDown() is removed.
+        cleanup(torch_device, gc_collect=False)
+
     @require_read_token
     def test_model_2b_fp16(self):
         model_id = "google/gemma-2b"