set fsdp state dict (#584)

Co-authored-by: Jan Philipp Harries <jphme@users.noreply.github.com>

src/axolotl/train.py

@@ -117,6 +117,10 @@ def train(
 
     LOG.info(f"Training Completed!!! Saving pre-trained model to {cfg.output_dir}")
 
+    if trainer.is_fsdp_enabled:
+        trainer.accelerator.state.fsdp_plugin.set_state_dict_type("FULL_STATE_DICT")
+        LOG.info("Set FSDP state dict type to FULL_STATE_DICT for saving.")
+
     if cfg.relora_steps:
         if cfg.adapter == "lora" and not (cfg.load_in_4bit or cfg.load_in_8bit):
             model = model.merge_and_unload()