Feature BAdam

Former-commit-id: d8d2807fbcf587c37f7fd34a23e9397d2775ceed

src/llmtuner/train/utils.py

@@ -287,12 +287,69 @@ def _create_loraplus_optimizer(
     logger.info("Using LoRA+ optimizer with loraplus lr ratio {:.2f}.".format(finetuning_args.loraplus_lr_ratio))
     return optimizer
 
+def _create_badam_optimizer(
+    model: "PreTrainedModel",
+    training_args: "Seq2SeqTrainingArguments",
+    finetuning_args: "FinetuningArguments",
+) -> "torch.optim.Optimizer":
+    
+    from transformers.trainer_pt_utils import get_parameter_names
+    decay_parameters = list(filter(lambda n: "bias" not in n, get_parameter_names(model, ALL_LAYERNORM_LAYERS)))
+    # filter out the embedding layers when using badam ratio mode
+    if finetuning_args.badam_mode == "ratio":
+        decay_parameters = list(filter(lambda n: "embed" not in n, decay_parameters)) # TODO: make it more general
+    optimizer_grouped_parameters = [
+        {
+            "params": [p for n, p in model.named_parameters() if n in decay_parameters],
+            "weight_decay": training_args.weight_decay,
+        },
+        {
+            "params": [p for n, p in model.named_parameters() if n not in decay_parameters],
+            "weight_decay": 0.0,
+        },
+    ]
+
+    optimizer_cls, optimizer_kwargs = Trainer.get_optimizer_cls_and_kwargs(training_args)
+
+    # create BlockOptimizer
+    if finetuning_args.badam_mode == "layer":
+        from badam import BlockOptimizer
+        base_optimizer = optimizer_cls(optimizer_grouped_parameters, **optimizer_kwargs)
+        optimizer = BlockOptimizer(base_optimizer=base_optimizer,
+                                named_parameters_list=list(model.named_parameters()),
+                                block_prefix_list=None,
+                                switch_block_every=finetuning_args.switch_block_every,
+                                start_block=finetuning_args.start_block,
+                                switch_mode=finetuning_args.switch_mode,
+                                verbose=finetuning_args.badam_verbose)
+        
+        logger.info(f"Using BAdam optimizer with layer-wise update, switch mode is {finetuning_args.switch_mode}, "
+                    f"switch block every {finetuning_args.switch_block_every} steps, "
+                    f"default start block is {finetuning_args.start_block}")
+    
+    elif finetuning_args.badam_mode == "ratio":
+        assert finetuning_args.badam_update_ratio > 0.
+        from badam import BlockOptimizerRatio
+        optimizer = BlockOptimizerRatio(param_groups=optimizer_grouped_parameters,
+                                        named_parameters_list=list(model.named_parameters()),
+                                        update_ratio=finetuning_args.badam_update_ratio,
+                                        mask_mode=finetuning_args.badam_mask_mode,
+                                        verbose=finetuning_args.badam_verbose,
+                                        **optimizer_kwargs)
+        
+        logger.info(f"Using BAdam optimizer with ratio update, update ratio is {finetuning_args.badam_update_ratio}, "
+                    f"mask mode is {finetuning_args.badam_mask_mode}")
+    
+    return optimizer
 
 def create_custom_optimzer(
     model: "PreTrainedModel",
     training_args: "Seq2SeqTrainingArguments",
     finetuning_args: "FinetuningArguments",
 ) -> Optional["torch.optim.Optimizer"]:
+    if finetuning_args.use_badam:
+        return _create_badam_optimizer(model, training_args, finetuning_args)
+    
     if finetuning_args.use_galore:
         return _create_galore_optimizer(model, training_args, finetuning_args)