Fix SeamlessM4Tv2ModelIntegrationTest (#27911)

change dtype of some integration tests

Author: ylacombe

tests/models/seamless_m4t_v2/test_modeling_seamless_m4t_v2.py

@@ -1014,8 +1014,9 @@ def input_audio(self):
         )
 
     def factory_test_task(self, class1, class2, inputs, class1_kwargs, class2_kwargs):
-        model1 = class1.from_pretrained(self.repo_id).to(torch_device)
-        model2 = class2.from_pretrained(self.repo_id).to(torch_device)
+        # half-precision loading to limit GPU usage
+        model1 = class1.from_pretrained(self.repo_id, torch_dtype=torch.float16).to(torch_device)
+        model2 = class2.from_pretrained(self.repo_id, torch_dtype=torch.float16).to(torch_device)
 
         set_seed(0)
         output_1 = model1.generate(**inputs, **class1_kwargs)