[v1] add seed for training and fix gradient checkpointing (#10211)

src/llamafactory/v1/config/training_args.py

@@ -66,7 +66,7 @@ class TrainingArguments:
         metadata={"help": "Number of workers for batching."},
     )
     enable_activation_checkpointing: bool = field(
-        default=True,
+        default=False,
         metadata={"help": "Enable activation checkpointing for training."},
     )
     dist_config: PluginConfig | None = field(
@@ -81,6 +81,10 @@ class TrainingArguments:
         default=None,
         metadata={"help": "Learning rate scheduler configuration for training."},
     )
+    seed: int = field(
+        default=42,
+        metadata={"help": "Random seed that will be set at the beginning of training."},
+    )
 
     def __post_init__(self) -> None:
         self.dist_config = get_plugin_config(self.dist_config)