Intel Gen 4 Xeon and later support bf16 (#6367)

* Intel Gen 4 Xeon and later support bf16

* fix bf16 notes

examples/textual_inversion/textual_inversion.py

@@ -341,7 +341,7 @@ def parse_args():
         help=(
             "Whether to use mixed precision. Choose"
             "between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >= 1.10."
-            "and an Nvidia Ampere GPU."
+            "and Nvidia Ampere GPU or Intel Gen 4 Xeon (and later) ."
         ),
     )
     parser.add_argument(