deprecate is_torch_bf16_available (#17738)

* deprecate is_torch_bf16_available

* address suggestions

src/transformers/testing_utils.py

@@ -67,7 +67,8 @@ from .utils import (
     is_timm_available,
     is_tokenizers_available,
     is_torch_available,
-    is_torch_bf16_available,
+    is_torch_bf16_cpu_available,
+    is_torch_bf16_gpu_available,
     is_torch_tf32_available,
     is_torch_tpu_available,
     is_torchaudio_available,
@@ -486,11 +487,19 @@ def require_torch_gpu(test_case):
     return unittest.skipUnless(torch_device == "cuda", "test requires CUDA")(test_case)
 
 
-def require_torch_bf16(test_case):
-    """Decorator marking a test that requires torch>=1.10, using Ampere GPU or newer arch with cuda>=11.0 or using CPU."""
+def require_torch_bf16_gpu(test_case):
+    """Decorator marking a test that requires torch>=1.10, using Ampere GPU or newer arch with cuda>=11.0"""
     return unittest.skipUnless(
-        is_torch_bf16_available(),
-        "test requires torch>=1.10, using Ampere GPU or newer arch with cuda>=11.0 or using CPU",
+        is_torch_bf16_gpu_available(),
+        "test requires torch>=1.10, using Ampere GPU or newer arch with cuda>=11.0",
+    )(test_case)
+
+
+def require_torch_bf16_cpu(test_case):
+    """Decorator marking a test that requires torch>=1.10, using CPU."""
+    return unittest.skipUnless(
+        is_torch_bf16_cpu_available(),
+        "test requires torch>=1.10, using CPU",
     )(test_case)