handle torch_compile set to auto (#2172) [skip ci]

* handle torch_compile set to auto

* update docs [skip ci]

* add tests

docs/config.qmd

@@ -337,7 +337,8 @@ comet_experiment_config: # Dictionary for additional configuration settings, see
 output_dir: ./completed-model
 
 # Whether to use torch.compile and which backend to use
-torch_compile:  # bool
+# setting to `auto` will enable torch compile when torch>=2.5.1
+torch_compile:  # Optional[Union[Literal["auto"], bool]]
 torch_compile_backend:  # Optional[str]
 
 # Training hyperparameters

src/axolotl/utils/config/__init__.py

@@ -245,8 +245,8 @@ def validate_config(
         ) = merge_input_args()
 
     if capabilities or env_capabilities:
-        if (capabilities and not env_capabilities) or (
+        if (capabilities and env_capabilities is None) or (
-            env_capabilities and not capabilities
+            env_capabilities and capabilities is None
         ):
             raise ValueError(
                 "Both capabilities and env_capabilities must be provided or not provided."

src/axolotl/utils/config/models/input/v0_4_1/__init__.py

@@ -741,7 +741,7 @@ class AxolotlInputConfig(
     special_tokens: Optional[SpecialTokensConfig] = None
     tokens: Optional[List[str]] = None
 
-    torch_compile: Optional[bool] = None
+    torch_compile: Optional[Union[Literal["auto"], bool]] = None
     torch_compile_backend: Optional[str] = None
     torch_compile_mode: Optional[
         Literal["default", "reduce-overhead", "max-autotune"]
@@ -1582,3 +1582,22 @@ class AxolotlConfigWCapabilities(AxolotlInputConfig):
                     "ADOPT optimizer is incompatible with torch version < 2.5.1"
                 )
         return data
+
+    @model_validator(mode="before")
+    @classmethod
+    def check_torch_compile_auto(cls, data):
+        if data.get("torch_compile") == "auto":
+            env_capabilities = data.get("env_capabilities", {})
+            if env_capabilities.get("torch_version"):
+                if version.parse(
+                    env_capabilities.get("torch_version")
+                ) >= version.parse("2.5.1"):
+                    LOG.info(
+                        "torch.compile is available, setting torch_compile to True"
+                    )
+                    data["torch_compile"] = True
+                else:
+                    data["torch_compile"] = False
+            else:
+                data["torch_compile"] = False
+        return data

tests/patched/test_validation.py

@@ -1196,6 +1196,46 @@ class TestValidation(BaseValidation):
         )
 
 
+class TestTorchCompileValidation(BaseValidation):
+    """
+    test suite for when torch_compile is set to 'auto'
+    """
+
+    def test_torch_compile_auto(self, minimal_cfg):
+        cfg = (
+            DictDefault(
+                {
+                    "torch_compile": "auto",
+                }
+            )
+            | minimal_cfg
+        )
+
+        env_capabilities = {"torch_version": "2.5.1"}
+        capabilities = {"bf16": True}
+        updated_cfg = validate_config(
+            cfg, capabilities=capabilities, env_capabilities=env_capabilities
+        )
+
+        assert updated_cfg.torch_compile is True
+
+        env_capabilities = {"torch_version": "2.4.1"}
+        capabilities = {"bf16": True}
+        updated_cfg = validate_config(
+            cfg, capabilities=capabilities, env_capabilities=env_capabilities
+        )
+
+        assert updated_cfg.torch_compile is False
+
+        env_capabilities = {}
+        capabilities = {"bf16": True}
+        updated_cfg = validate_config(
+            cfg, capabilities=capabilities, env_capabilities=env_capabilities
+        )
+
+        assert updated_cfg.torch_compile is False
+
+
 class TestValidationCheckModelConfig(BaseValidation):
     """
     Test the validation for the config when the model config is available