Fix for setting adam_beta3 and adam_epsilon2 for CAME Optimizer (#2654) [skip ci]

* make setting `adam_beta3` and `adam_epsilon2` work correctly

* update config docs so users know args are specific to CAME optim

---------

Co-authored-by: Wing Lian <wing@axolotl.ai>

docs/config.qmd

@@ -633,7 +633,9 @@ weight_decay:
 # adamw hyperparams
 adam_beta1:
 adam_beta2:
+adam_beta3:  # only used for CAME Optimizer
 adam_epsilon:
+adam_epsilon2:  # only used for CAME Optimizer
 # Gradient clipping max norm
 max_grad_norm:
 

src/axolotl/core/trainer_builder.py

@@ -387,8 +387,12 @@ class HFCausalTrainerBuilder(TrainerBuilderBase):
             training_arguments_kwargs["adam_beta1"] = self.cfg.adam_beta1
         if self.cfg.adam_beta2:
             training_arguments_kwargs["adam_beta2"] = self.cfg.adam_beta2
+        if self.cfg.adam_beta3:
+            training_arguments_kwargs["adam_beta3"] = self.cfg.adam_beta3
         if self.cfg.adam_epsilon:
             training_arguments_kwargs["adam_epsilon"] = self.cfg.adam_epsilon
+        if self.cfg.adam_epsilon2:
+            training_arguments_kwargs["adam_epsilon2"] = self.cfg.adam_epsilon2
         if self.cfg.max_grad_norm:
             training_arguments_kwargs["max_grad_norm"] = self.cfg.max_grad_norm
 
@@ -713,7 +717,7 @@ class HFCausalTrainerBuilder(TrainerBuilderBase):
 
                 beta1 = training_arguments_kwargs.get("adam_beta1", 0.9)
                 beta2 = training_arguments_kwargs.get("adam_beta2", 0.999)
-                beta3 = training_arguments_kwargs.get("adam_beta2", 0.9999)
+                beta3 = training_arguments_kwargs.get("adam_beta3", 0.9999)
                 eps1 = training_arguments_kwargs.get("adam_epsilon", 1e-30)
                 eps2 = training_arguments_kwargs.get("adam_epsilon2", 1e-16)
                 adam_kwargs["betas"] = (beta1, beta2, beta3)

src/axolotl/core/training_args.py

@@ -227,6 +227,19 @@ class AxolotlTrainingMixins:
         },
     )
 
+    adam_beta3: Optional[float] = field(
+        default=None,
+        metadata={
+            "help": "The beta3 hyperparameter used in some optimizers such as CAME"
+        },
+    )
+    adam_epsilon2: Optional[float] = field(
+        default=None,
+        metadata={
+            "help": "The epsilon2 hyperparameter used in some optimizers such as CAME"
+        },
+    )
+
     # multi-modal section
 
     image_size: int | tuple[int, int] | None = field(