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# Copyright 2024 the LlamaFactory team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import TYPE_CHECKING, Dict, Optional, Sequence, Set, Tuple, Union
import torch
from peft import PeftModel
from transformers import AutoModelForCausalLM
from trl import AutoModelForCausalLMWithValueHead
from ..data import get_dataset, get_template_and_fix_tokenizer
from ..extras.misc import get_current_device
from ..hparams import get_infer_args, get_train_args
from ..model import load_model, load_tokenizer
if TYPE_CHECKING:
from datasets import Dataset
from peft import LoraModel
from transformers import PreTrainedModel
def compare_model(model_a: "torch.nn.Module", model_b: "torch.nn.Module", diff_keys: Sequence[str] = []) -> None:
state_dict_a = model_a.state_dict()
state_dict_b = model_b.state_dict()
assert set(state_dict_a.keys()) == set(state_dict_b.keys())
for name in state_dict_a.keys():
if any(key in name for key in diff_keys):
assert torch.allclose(state_dict_a[name], state_dict_b[name], rtol=1e-3, atol=1e-4) is False
else:
assert torch.allclose(state_dict_a[name], state_dict_b[name], rtol=1e-3, atol=1e-4) is True
def check_lora_model(model: "LoraModel") -> Tuple[Set[str], Set[str]]:
linear_modules, extra_modules = set(), set()
for name, param in model.named_parameters():
if any(module in name for module in ["lora_A", "lora_B"]):
linear_modules.add(name.split(".lora_", maxsplit=1)[0].split(".")[-1])
assert param.requires_grad is True
assert param.dtype == torch.float32
elif "modules_to_save" in name:
extra_modules.add(name.split(".modules_to_save", maxsplit=1)[0].split(".")[-1])
assert param.requires_grad is True
assert param.dtype == torch.float32
else:
assert param.requires_grad is False
assert param.dtype == torch.float16
return linear_modules, extra_modules
def load_train_model(add_valuehead: bool = False, **kwargs) -> "PreTrainedModel":
model_args, _, _, finetuning_args, _ = get_train_args(kwargs)
tokenizer = load_tokenizer(model_args)["tokenizer"]
return load_model(tokenizer, model_args, finetuning_args, is_trainable=True, add_valuehead=add_valuehead)
def load_infer_model(add_valuehead: bool = False, **kwargs) -> "PreTrainedModel":
model_args, _, finetuning_args, _ = get_infer_args(kwargs)
tokenizer = load_tokenizer(model_args)["tokenizer"]
return load_model(tokenizer, model_args, finetuning_args, is_trainable=False, add_valuehead=add_valuehead)
def load_reference_model(
model_path: str,
lora_path: Optional[str] = None,
use_lora: bool = False,
use_pissa: bool = False,
is_trainable: bool = False,
add_valuehead: bool = False,
) -> Union["PreTrainedModel", "LoraModel"]:
if add_valuehead:
model: "AutoModelForCausalLMWithValueHead" = AutoModelForCausalLMWithValueHead.from_pretrained(
model_path, torch_dtype=torch.float16, device_map=get_current_device()
)
if not is_trainable:
model.v_head = model.v_head.to(torch.float16)
return model
model = AutoModelForCausalLM.from_pretrained(
model_path, torch_dtype=torch.float16, device_map=get_current_device()
)
if use_lora or use_pissa:
model = PeftModel.from_pretrained(
model, lora_path, subfolder="pissa_init" if use_pissa else None, is_trainable=is_trainable
)
for param in filter(lambda p: p.requires_grad, model.parameters()):
param.data = param.data.to(torch.float32)
return model
def load_train_dataset(**kwargs) -> "Dataset":
model_args, data_args, training_args, _, _ = get_train_args(kwargs)
tokenizer_module = load_tokenizer(model_args)
template = get_template_and_fix_tokenizer(tokenizer_module["tokenizer"], data_args)
dataset_module = get_dataset(template, model_args, data_args, training_args, kwargs["stage"], **tokenizer_module)
return dataset_module["train_dataset"]
def patch_valuehead_model():
def post_init(self: "AutoModelForCausalLMWithValueHead", state_dict: Dict[str, "torch.Tensor"]) -> None:
state_dict = {k[7:]: state_dict[k] for k in state_dict.keys() if k.startswith("v_head.")}
self.v_head.load_state_dict(state_dict, strict=False)
del state_dict
AutoModelForCausalLMWithValueHead.post_init = post_init
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