refactor adapter hparam

src/llmtuner/model/patches.py

@@ -0,0 +1,94 @@
+import math
+import torch
+from types import MethodType
+from typing import TYPE_CHECKING
+
+from transformers import PreTrainedModel, PreTrainedTokenizerBase
+
+from llmtuner.extras.logging import get_logger
+from llmtuner.extras.misc import infer_optim_dtype
+
+if TYPE_CHECKING:
+    from transformers import PretrainedConfig, PreTrainedTokenizer
+    from trl import AutoModelForCausalLMWithValueHead
+    from llmtuner.hparams import ModelArguments
+
+
+logger = get_logger(__name__)
+
+
+def patch_config(config: "PretrainedConfig", model_args: "ModelArguments", is_trainable: bool):
+    if model_args.compute_dtype is None: # priority: bf16 > fp16 > fp32
+        model_args.compute_dtype = infer_optim_dtype(model_dtype=getattr(config, "torch_dtype", None))
+    setattr(config, "torch_dtype", model_args.compute_dtype)
+
+    if getattr(config, "model_type", None) == "qwen":
+        for dtype_name, dtype in [("fp16", torch.float16), ("bf16", torch.bfloat16), ("fp32", torch.float32)]:
+            setattr(config, dtype_name, getattr(config, "torch_dtype", None) == dtype)
+
+    if model_args.rope_scaling is not None:
+        if not hasattr(config, "rope_scaling"):
+            logger.warning("Current model does not support RoPE scaling.")
+        else:
+            if is_trainable:
+                if model_args.rope_scaling == "dynamic":
+                    logger.warning(
+                        "Dynamic NTK may not work well with fine-tuning. "
+                        "See: https://github.com/huggingface/transformers/pull/24653"
+                    )
+
+                current_max_length = getattr(config, "max_position_embeddings", None)
+                if current_max_length and model_args.model_max_length > current_max_length:
+                    scaling_factor = float(math.ceil(model_args.model_max_length / current_max_length))
+                else:
+                    logger.warning("Input length is smaller than max length. Consider increase input length.")
+                    scaling_factor = 1.0
+            else:
+                scaling_factor = 2.0
+
+            setattr(config, "rope_scaling", {"type": model_args.rope_scaling, "factor": scaling_factor})
+            logger.info("Using {} scaling strategy and setting scaling factor to {}".format(
+                model_args.rope_scaling, scaling_factor
+            ))
+
+    # Set shift short attention (S^2-Attn)
+    if is_trainable and model_args.shift_attn:
+        logger.warning("Shift short attention is temporarily invalid due to breaking changes.")
+        # if getattr(config, "model_type", None) == "llama":
+        #     setattr(config, "group_size_ratio", 0.25)
+        #     logger.info("Using shift short attention with group_size_ratio=1/4.")
+        # else:
+        #     logger.warning("Current model does not support shift short attention.")
+
+
+def patch_model(model: "PreTrainedModel"):
+    if "GenerationMixin" not in str(model.generate.__func__):
+        model.generate = MethodType(PreTrainedModel.generate, model)
+
+    if getattr(model.config, "model_type", None) == "chatglm":
+        setattr(model, "lm_head", model.transformer.output_layer)
+        setattr(model, "_keys_to_ignore_on_save", ["lm_head.weight"])
+
+
+def patch_valuehead_model(model: "AutoModelForCausalLMWithValueHead"):
+    def get_input_embeddings(self: "AutoModelForCausalLMWithValueHead") -> torch.nn.Module:
+        return self.pretrained_model.get_input_embeddings()
+
+    setattr(model, "get_input_embeddings", MethodType(get_input_embeddings, model))
+    ignore_modules = [name for name, _ in model.named_parameters() if "pretrained_model" in name]
+    setattr(model, "_keys_to_ignore_on_save", ignore_modules)
+    setattr(model, "tie_weights", MethodType(lambda _: None, model)) # use empty method
+
+
+def patch_tokenizer(tokenizer: "PreTrainedTokenizer"):
+    if "PreTrainedTokenizerBase" not in str(tokenizer._pad.__func__):
+        tokenizer._pad = MethodType(PreTrainedTokenizerBase._pad, tokenizer)
+
+
+def register_autoclass(config: "PretrainedConfig", model: "PreTrainedModel", tokenizer: "PreTrainedTokenizerBase"):
+    if "AutoConfig" in getattr(config, "auto_map", {}):
+        config.__class__.register_for_auto_class()
+    if "AutoModelForCausalLM" in getattr(config, "auto_map", {}):
+        model.__class__.register_for_auto_class()
+    if "AutoTokenizer" in tokenizer.init_kwargs.get("auto_map", {}):
+        tokenizer.__class__.register_for_auto_class()