Fix `PersimmonIntegrationTest` OOM (#26750)

* fix

---------
Co-authored-by: ydshieh <ydshieh@users.noreply.github.com>

tests/models/persimmon/test_modeling_persimmon.py

@@ -15,6 +15,7 @@
 """ Testing suite for the PyTorch Persimmon model. """
 
 
+import gc
 import unittest
 
 from parameterized import parameterized
@@ -395,19 +396,27 @@ class PersimmonIntegrationTest(unittest.TestCase):
     def test_model_8b_chat_logits(self):
         input_ids = [1, 306, 4658, 278, 6593, 310, 2834, 338]
         model = PersimmonForCausalLM.from_pretrained(
-            "adept/persimmon-8b-chat", device_map="auto", torch_dtype=torch.float16
+            "adept/persimmon-8b-chat", load_in_8bit=True, device_map={"": 0}, torch_dtype=torch.float16
         )
-        out = model(torch.tensor([input_ids])).logits
+        out = model(torch.tensor([input_ids], device=torch_device)).logits
 
         EXPECTED_MEAN = torch.tensor(
-            [[-11.2879, -11.2628, -11.2498, -11.2534, -11.2676, -11.2638, -11.2501, -11.2431]], dtype=torch.float16
+            [[-11.4726, -11.1495, -11.2694, -11.2223, -10.9452, -11.0663, -11.0031, -11.1028]]
         )
-        torch.testing.assert_close(out.cpu().mean(-1), EXPECTED_MEAN, atol=1e-4, rtol=1e-4)
+        # change dtype to `torch.float32` before calling `mean` to avoid `nan` values
+        torch.testing.assert_close(out.cpu().to(torch.float32).mean(-1), EXPECTED_MEAN, atol=1e-4, rtol=1e-4)
         # fmt: off
-        EXPECTED_SLICE = torch.tensor([-16.9670, -16.9647, -16.9649, -16.9630, -16.9577, -16.9623, -17.0164, -16.9673, -16.9648, -16.9668, -17.0160, -16.9651, -17.0156, -16.9668, -16.9655, -16.9653, -16.9665, -16.9682, -17.0112, -16.9667, -16.9717, -16.9654, -16.9650, -16.9701, -16.9657, -17.0160, -16.9676, -17.0138, -16.9610, -16.9695])
+        EXPECTED_SLICE = torch.tensor(
+            [-16.9062, -16.9062, -16.9062, -16.9062, -16.8906, -16.9062, -16.9531, -16.9062, -16.9062, -16.9062, -16.9531, -16.9062, -16.9531, -16.9062, -16.9062, -16.9062, -16.9062, -16.9062, -16.9531, -16.9062, -16.9062, -16.9062, -16.9062, -16.9062, -16.9062, -16.9531, -16.9062, -16.9531, -16.9062, -16.9062],
+            dtype=torch.float16
+        )
         # fmt: on
         torch.testing.assert_close(out.cpu()[0, 0, :30], EXPECTED_SLICE, atol=1e-5, rtol=1e-5)
 
+        torch.cuda.empty_cache()
+        del model
+        gc.collect()
+
     @slow
     @require_torch_gpu
     def test_model_8b_chat_greedy_generation(self):
@@ -415,11 +424,15 @@ class PersimmonIntegrationTest(unittest.TestCase):
         prompt = "human: Simply put, the theory of relativity states that?\n\nadept:"
         tokenizer = AutoTokenizer.from_pretrained("adept/persimmon-8b-chat", use_fast=False)
         input_ids = tokenizer.encode(prompt, return_tensors="pt").to(torch_device)
-        model = PersimmonForCausalLM.from_pretrained("adept/persimmon-8b-chat", torch_dtype=torch.float16).to(
-            torch_device
+        model = PersimmonForCausalLM.from_pretrained(
+            "adept/persimmon-8b-chat", load_in_8bit=True, device_map={"": 0}, torch_dtype=torch.float16
         )
 
         # greedy generation outputs
         generated_ids = model.generate(input_ids, max_new_tokens=64)
         text = tokenizer.decode(generated_ids[0], skip_special_tokens=True)
         self.assertEqual(EXPECTED_TEXT_COMPLETION, text)
+
+        torch.cuda.empty_cache()
+        del model
+        gc.collect()