Remove backend check for torch.compile (#22140)

* Remove backend enforcment for torch.compile

* Update error

* Update src/transformers/training_args.py
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>

* Apply suggestions from code review
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>

* Style

---------
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>

src/transformers/trainer.py

@@ -672,7 +672,7 @@ class Trainer:
 
         # torch.compile
         if args.torch_compile and not is_torch_compile_available():
-            raise RuntimeError("Using torch.compile requires a nightly install of PyTorch.")
+            raise RuntimeError("Using torch.compile requires PyTorch 2.0 or higher.")
 
     def add_callback(self, callback):
         """

src/transformers/training_args.py

@@ -85,20 +85,6 @@ log_levels = logging.get_log_levels_dict().copy()
 trainer_log_levels = dict(**log_levels, passive=-1)
 
 
-TORCH_COMPILE_BACKENDS = [
-    "eager",
-    "aot_eager",
-    "inductor",
-    "nvfuser",
-    "aot_nvfuser",
-    "aot_cudagraphs",
-    "ofi",
-    "fx2trt",
-    "onnxrt",
-    "ipex",
-]
-
-
 def default_logdir() -> str:
     """
     Same default as PyTorch
@@ -571,17 +557,24 @@ class TrainingArguments:
             Whether or not to compile the model using PyTorch 2.0
             [`torch.compile`](https://pytorch.org/get-started/pytorch-2.0/) (requires a nighlty install of PyTorch).
 
-            If set, the backend will default to `"inductor"` (can be customized with `torch_compile_backend`) and the
-            mode will default to `"default"` (can be customized with `torch_compile_mode`).
+            This will use the best defaults for the [`torch.compile`
+            API](https://pytorch.org/docs/2.0/generated/torch.compile.html?highlight=torch+compile#torch.compile). You
+            can customize the defaults with the argument `torch_compile_backend` and `torch_compile_mode` but we don't
+            guarantee any of them will work as the support is progressively rolled in in PyTorch.
+
+            This flag and the whole compile API is experimental and subject to change in future releases.
         torch_compile_backend (`str`, *optional*):
             The backend to use in `torch.compile`. If set to any value, `torch_compile` will be set to `True`.
 
-            Possible choices are `"eager"`, `"aot_eager"`, `"inductor"`, `"nvfuser"`, `"aot_nvfuser"`,
-            `"aot_cudagraphs"`, `"ofi"`, `"fx2trt"`, `"onnxrt"` and `"ipex"`.
+            Refer to the PyTorch doc for possible values and note that they may change across PyTorch versions.
+
+            This flag is experimental and subject to change in future releases.
         torch_compile_mode (`str`, *optional*):
             The mode to use in `torch.compile`. If set to any value, `torch_compile` will be set to `True`.
 
-            Possible choices are `"default"`, `"reduce-overhead"` and `"max-autotune"`.
+            Refer to the PyTorch doc for possible values and note that they may change across PyTorch versions.
+
+            This flag is experimental and subject to change in future releases.
     """
 
     framework = "pt"
@@ -1061,7 +1054,6 @@ class TrainingArguments:
         default=None,
         metadata={
             "help": "This argument is deprecated, use `--torch_compile_backend` instead.",
-            "choices": TORCH_COMPILE_BACKENDS,
         },
     )
     ray_scope: Optional[str] = field(
@@ -1090,14 +1082,12 @@ class TrainingArguments:
         default=None,
         metadata={
             "help": "Which backend to use with `torch.compile`, passing one will trigger a model compilation.",
-            "choices": TORCH_COMPILE_BACKENDS,
         },
     )
     torch_compile_mode: Optional[str] = field(
         default=None,
         metadata={
             "help": "Which mode to use with `torch.compile`, passing one will trigger a model compilation.",
-            "choices": ["default", "reduce-overhead", "max-autotune"],
         },
     )
 

src/transformers/utils/import_utils.py

@@ -478,6 +478,8 @@ def is_torch_compile_available():
 
     import torch
 
+    # We don't do any version check here to support nighlies marked as 1.14. Ultimately needs to check version against
+    # 2.0 but let's do it later.
     return hasattr(torch, "compile")