[Pipeline] fix failing bloom `pipeline` test (#20778)

fix failing `pipeline` test

tests/pipelines/test_pipelines_text_generation.py

@@ -284,10 +284,10 @@ class TextGenerationPipelineTests(unittest.TestCase, metaclass=PipelineTestCaseM
             ],
         )
 
-        # torch_dtype not necessary
+        # torch_dtype will be automatically set to float32 if not provided - check: https://github.com/huggingface/transformers/pull/20602
         pipe = pipeline(model="hf-internal-testing/tiny-random-bloom", device_map="auto")
         self.assertEqual(pipe.model.device, torch.device(0))
-        self.assertEqual(pipe.model.lm_head.weight.dtype, torch.bfloat16)
+        self.assertEqual(pipe.model.lm_head.weight.dtype, torch.float32)
         out = pipe("This is a test")
         self.assertEqual(
             out,