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save_and_load.py
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save_and_load.py
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# Copyright 2023-present the HuggingFace Inc. 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 __future__ import annotations
import os
import warnings
from typing import Optional
import torch
from huggingface_hub import file_exists, hf_hub_download
from huggingface_hub.utils import EntryNotFoundError
from safetensors.torch import load_file as safe_load_file
from .other import (
EMBEDDING_LAYER_NAMES,
SAFETENSORS_WEIGHTS_NAME,
WEIGHTS_NAME,
check_file_exists_on_hf_hub,
infer_device,
)
from .peft_types import PeftType
def has_valid_embedding_base_layer(layer):
"""Check if the layer has an embedding base layer"""
return hasattr(layer, "base_layer") and isinstance(layer.base_layer, (torch.nn.Linear, torch.nn.Embedding))
def get_embedding_layer_name(model, layer, is_embedding_in_target_modules):
"""Get the name of the embedding module for a given layer."""
for name, module in model.named_modules():
if (not is_embedding_in_target_modules and module == layer) or module == getattr(layer, "base_layer", None):
return name
return None
def get_peft_model_state_dict(
model, state_dict=None, adapter_name="default", unwrap_compiled=False, save_embedding_layers="auto"
):
"""
Get the state dict of the Peft model.
Args:
model ([`PeftModel`]): The Peft model. When using torch.nn.DistributedDataParallel, DeepSpeed or FSDP,
the model should be the underlying model/unwrapped model (i.e. model.module).
state_dict (`dict`, *optional*, defaults to `None`):
The state dict of the model. If not provided, the state dict of the passed model will be used.
adapter_name (`str`, *optional*, defaults to `"default"`):
The name of the adapter whose state dict should be returned.
unwrap_compiled (`bool`, *optional*, defaults to `False`):
Whether to unwrap the model if torch.compile was used.
save_embedding_layers (`Union[bool, str]`, , *optional*, defaults to `auto`):
If `True`, save the embedding layers in addition to adapter weights. If `auto`, checks the common embedding
layers `peft.utils.other.EMBEDDING_LAYER_NAMES` in config's `target_modules` when available. Based on it
sets the boolean flag. This only works for 馃 transformers models.
"""
if unwrap_compiled:
model = getattr(model, "_orig_mod", model)
config = model.peft_config[adapter_name]
if state_dict is None:
state_dict = model.state_dict()
if config.peft_type in (PeftType.LORA, PeftType.ADALORA):
# to_return = lora_state_dict(model, bias=model.peft_config.bias)
# adapted from `https://github.com/microsoft/LoRA/blob/main/loralib/utils.py`
# to be used directly with the state dict which is necessary when using DeepSpeed or FSDP
bias = config.bias
if bias == "none":
to_return = {k: state_dict[k] for k in state_dict if "lora_" in k}
elif bias == "all":
to_return = {k: state_dict[k] for k in state_dict if "lora_" in k or "bias" in k}
elif bias == "lora_only":
to_return = {}
for k in state_dict:
if "lora_" in k:
to_return[k] = state_dict[k]
bias_name = k.split("lora_")[0] + "bias"
if bias_name in state_dict:
to_return[bias_name] = state_dict[bias_name]
else:
raise NotImplementedError
to_return = {k: v for k, v in to_return.items() if (("lora_" in k and adapter_name in k) or ("bias" in k))}
if config.peft_type == PeftType.ADALORA:
rank_pattern = config.rank_pattern
if rank_pattern is not None:
rank_pattern = {k.replace(f".{adapter_name}", ""): v for k, v in rank_pattern.items()}
config.rank_pattern = rank_pattern
to_return = model.resize_state_dict_by_rank_pattern(rank_pattern, to_return, adapter_name)
elif config.peft_type == PeftType.BOFT:
bias = config.bias
if bias == "none":
to_return = {k: state_dict[k] for k in state_dict if "boft_" in k}
elif bias == "all":
to_return = {k: state_dict[k] for k in state_dict if "boft_" in k or "bias" in k}
elif bias == "boft_only":
to_return = {}
for k in state_dict:
if "boft_" in k:
to_return[k] = state_dict[k]
bias_name = k.split("boft_")[0] + "bias"
if bias_name in state_dict:
to_return[bias_name] = state_dict[bias_name]
else:
raise NotImplementedError
elif config.peft_type == PeftType.LOHA:
to_return = {k: state_dict[k] for k in state_dict if "hada_" in k}
elif config.peft_type == PeftType.LOKR:
to_return = {k: state_dict[k] for k in state_dict if "lokr_" in k}
elif config.peft_type == PeftType.ADAPTION_PROMPT:
to_return = {k: state_dict[k] for k in state_dict if k.split(".")[-1].startswith("adaption_")}
elif config.is_prompt_learning:
to_return = {}
if config.peft_type == PeftType.MULTITASK_PROMPT_TUNING:
to_return["prefix_task_cols"] = model.prompt_encoder[adapter_name].prefix_task_cols
to_return["prefix_task_rows"] = model.prompt_encoder[adapter_name].prefix_task_rows
prompt_embeddings = model.prompt_encoder[adapter_name].embedding.weight
else:
if config.inference_mode:
prompt_embeddings = model.prompt_encoder[adapter_name].embedding.weight
else:
prompt_embeddings = model.get_prompt_embedding_to_save(adapter_name)
to_return["prompt_embeddings"] = prompt_embeddings
elif config.peft_type == PeftType.IA3:
to_return = {k: state_dict[k] for k in state_dict if "ia3_" in k}
elif config.peft_type == PeftType.OFT:
to_return = {k: state_dict[k] for k in state_dict if "oft_" in k}
elif config.peft_type == PeftType.POLY:
to_return = {k: state_dict[k] for k in state_dict if "poly_" in k}
elif config.peft_type == PeftType.VERA:
to_return = {k: state_dict[k] for k in state_dict if "vera_lambda_" in k}
if config.save_projection:
# TODO: adding vera_A and vera_B to `self.get_base_layer` would
# make name to match here difficult to predict.
if f"base_model.vera_A.{adapter_name}" not in state_dict:
raise ValueError(
"Model was initialised to not save vera_A and vera_B but config now specifies to save projection!"
" Set `config.save_projection` to `False`."
)
to_return["base_model.vera_A." + adapter_name] = state_dict["base_model.vera_A." + adapter_name]
to_return["base_model.vera_B." + adapter_name] = state_dict["base_model.vera_B." + adapter_name]
else:
raise ValueError(f"Unknown PEFT type passed: {config.peft_type}")
if getattr(model, "modules_to_save", None) is not None:
for key, value in state_dict.items():
if any(f"{module_name}.modules_to_save.{adapter_name}" in key for module_name in model.modules_to_save):
to_return[key.replace("modules_to_save.", "")] = value
# check the common embedding layers in `target_modules` to reset `save_embedding_layers` if necessary
is_embedding_in_target_modules = False
if (
save_embedding_layers == "auto"
and hasattr(config, "target_modules")
and any(k in config.target_modules for k in EMBEDDING_LAYER_NAMES)
):
warnings.warn("Setting `save_embedding_layers` to `True` as embedding layers found in `target_modules`.")
save_embedding_layers = is_embedding_in_target_modules = True
elif save_embedding_layers == "auto":
vocab_size = getattr(getattr(model, "config", None), "vocab_size", None)
model_id = getattr(config, "base_model_name_or_path", None)
# For some models e.g. diffusers the text config file is stored in a subfolder
# we need to make sure we can download that config.
has_remote_config = False
# ensure that this check is not performed in HF offline mode, see #1452
if model_id is not None:
exists = check_file_exists_on_hf_hub(model_id, "config.json")
if exists is None:
# check failed, could not determine if it exists or not
warnings.warn(
f"Could not find a config file in {model_id} - will assume that the vocabulary was not modified."
)
has_remote_config = False
else:
has_remote_config = exists
# check if the vocab size of the base model is different from the vocab size of the finetuned model
if (
vocab_size
and model_id
and has_remote_config
and (vocab_size != model.config.__class__.from_pretrained(model_id).vocab_size)
):
warnings.warn(
"Setting `save_embedding_layers` to `True` as the embedding layer has been resized during finetuning."
)
save_embedding_layers = True
else:
save_embedding_layers = False
if save_embedding_layers and hasattr(model, "get_input_embeddings"):
for layer in [model.get_input_embeddings(), model.get_output_embeddings()]:
if not is_embedding_in_target_modules or has_valid_embedding_base_layer(layer):
# support from version >= 0.6.2
embedding_module_name = get_embedding_layer_name(model, layer, is_embedding_in_target_modules)
if embedding_module_name:
to_return.update({k: v for k, v in state_dict.items() if embedding_module_name in k})
elif save_embedding_layers:
warnings.warn("Could not identify embedding layer(s) because the model is not a 馃 transformers model.")
to_return = {k.replace(f".{adapter_name}", ""): v for k, v in to_return.items()}
return to_return
def _find_mismatched_keys(
model: torch.nn.Module, peft_model_state_dict: dict[str, torch.Tensor], ignore_mismatched_sizes: bool = False
) -> tuple[dict[str, torch.Tensor], list[tuple[str, tuple[int, ...], tuple[int, ...]]]]:
if not ignore_mismatched_sizes:
return peft_model_state_dict, []
mismatched = []
state_dict = model.state_dict()
for key, tensor in peft_model_state_dict.items():
if key not in state_dict:
continue
# see https://github.com/huggingface/transformers/blob/09f9f566de83eef1f13ee83b5a1bbeebde5c80c1/src/transformers/modeling_utils.py#L3858-L3864
if (state_dict[key].shape[-1] == 1) and (state_dict[key].numel() * 2 == tensor.numel()):
# This skips size mismatches for 4-bit weights. Two 4-bit values share an 8-bit container, causing size
# differences. Without matching with module type or paramter type it seems like a practical way to detect
# valid 4bit weights.
continue
if state_dict[key].shape != tensor.shape:
mismatched.append((key, tensor.shape, state_dict[key].shape))
for key, _, _ in mismatched:
del peft_model_state_dict[key]
return peft_model_state_dict, mismatched
def set_peft_model_state_dict(
model, peft_model_state_dict, adapter_name="default", ignore_mismatched_sizes: bool = False
):
"""
Set the state dict of the Peft model.
Args:
model ([`PeftModel`]):
The Peft model.
peft_model_state_dict (`dict`):
The state dict of the Peft model.
adapter_name (`str`, *optional*, defaults to `"default"`):
The name of the adapter whose state dict should be set.
ignore_mismatched_sizes (`bool`, *optional*, defaults to `False`):
Whether to ignore mismatched in the state dict.
"""
config = model.peft_config[adapter_name]
state_dict = {}
if getattr(model, "modules_to_save", None) is not None:
for key, value in peft_model_state_dict.items():
if any(module_name in key for module_name in model.modules_to_save):
for module_name in model.modules_to_save:
if module_name in key:
key = key.replace(module_name, f"{module_name}.modules_to_save.{adapter_name}")
break
state_dict[key] = value
else:
state_dict = peft_model_state_dict
if config.peft_type in (
PeftType.LORA,
PeftType.LOHA,
PeftType.LOKR,
PeftType.ADALORA,
PeftType.IA3,
PeftType.OFT,
PeftType.POLY,
PeftType.BOFT,
PeftType.VERA,
):
peft_model_state_dict = {}
parameter_prefix = {
PeftType.IA3: "ia3_",
PeftType.LORA: "lora_",
PeftType.ADALORA: "lora_",
PeftType.LOHA: "hada_",
PeftType.LOKR: "lokr_",
PeftType.OFT: "oft_",
PeftType.POLY: "poly_",
PeftType.BOFT: "boft_",
PeftType.VERA: "vera_lambda_",
}[config.peft_type]
for k, v in state_dict.items():
if parameter_prefix in k:
suffix = k.split(parameter_prefix)[1]
if "." in suffix:
suffix_to_replace = ".".join(suffix.split(".")[1:])
k = k.replace(suffix_to_replace, f"{adapter_name}.{suffix_to_replace}")
else:
k = f"{k}.{adapter_name}"
peft_model_state_dict[k] = v
else:
peft_model_state_dict[k] = v
if config.peft_type == PeftType.ADALORA:
rank_pattern = config.rank_pattern
if rank_pattern is not None:
model.resize_modules_by_rank_pattern(rank_pattern, adapter_name)
elif config.peft_type == PeftType.VERA:
if config.save_projection and "base_model.vera_A" not in peft_model_state_dict:
raise ValueError(
"Specified to load vera_A and vera_B from state dictionary however they were not present!"
)
elif not config.save_projection and "base_model.vera_A" in peft_model_state_dict:
warnings.warn(
"Specified to not load vera_A and vera_B from state dictionary however they are present in state"
" dictionary! Consider using them to ensure checkpoint loading is correct on all platforms using"
" `peft_config.save_projection = True`"
)
elif not config.save_projection: # and no vera_A in state dictionary
warnings.warn(
"Specified to not load vera_A and vera_B from state dictionary. This means we will be relying on"
" PRNG initialisation to restore these projections using `config.projection_prng_key`, which may"
" not be accurate on all system configurations."
)
elif config.is_prompt_learning or config.peft_type == PeftType.ADAPTION_PROMPT:
peft_model_state_dict = state_dict
else:
raise NotImplementedError
peft_model_state_dict, mismatched_keys = _find_mismatched_keys(
model, peft_model_state_dict, ignore_mismatched_sizes=ignore_mismatched_sizes
)
load_result = model.load_state_dict(peft_model_state_dict, strict=False)
if config.is_prompt_learning:
model.prompt_encoder[adapter_name].embedding.load_state_dict(
{"weight": peft_model_state_dict["prompt_embeddings"]}, strict=True
)
if config.peft_type == PeftType.MULTITASK_PROMPT_TUNING:
model.prompt_encoder[adapter_name].load_state_dict(peft_model_state_dict, strict=False)
if mismatched_keys:
# see https://github.com/huggingface/transformers/blob/09f9f566de83eef1f13ee83b5a1bbeebde5c80c1/src/transformers/modeling_utils.py#L4039
mismatched_warning = "\n".join(
[
f"- {key}: found shape {shape1} in the checkpoint and {shape2} in the model instantiated"
for key, shape1, shape2 in mismatched_keys
]
)
msg = (
f"Some weights of {model.__class__.__name__} were not initialized from the model checkpoint "
f"and are being ignored because you passed `ignore_mismatched_sizes=True`: {mismatched_warning}."
)
warnings.warn(msg)
return load_result
def load_peft_weights(model_id: str, device: Optional[str] = None, **hf_hub_download_kwargs) -> dict:
r"""
A helper method to load the PEFT weights from the HuggingFace Hub or locally
Args:
model_id (`str`):
The local path to the adapter weights or the name of the adapter to load from the HuggingFace Hub.
device (`str`):
The device to load the weights onto.
hf_hub_download_kwargs (`dict`):
Additional arguments to pass to the `hf_hub_download` method when loading from the HuggingFace Hub.
"""
path = (
os.path.join(model_id, hf_hub_download_kwargs["subfolder"])
if hf_hub_download_kwargs.get("subfolder", None) is not None
else model_id
)
if device is None:
device = infer_device()
if os.path.exists(os.path.join(path, SAFETENSORS_WEIGHTS_NAME)):
filename = os.path.join(path, SAFETENSORS_WEIGHTS_NAME)
use_safetensors = True
elif os.path.exists(os.path.join(path, WEIGHTS_NAME)):
filename = os.path.join(path, WEIGHTS_NAME)
use_safetensors = False
else:
token = hf_hub_download_kwargs.get("token", None)
if token is None:
token = hf_hub_download_kwargs.get("use_auth_token", None)
hub_filename = (
os.path.join(hf_hub_download_kwargs["subfolder"], SAFETENSORS_WEIGHTS_NAME)
if hf_hub_download_kwargs.get("subfolder", None) is not None
else SAFETENSORS_WEIGHTS_NAME
)
has_remote_safetensors_file = file_exists(
repo_id=model_id,
filename=hub_filename,
revision=hf_hub_download_kwargs.get("revision", None),
repo_type=hf_hub_download_kwargs.get("repo_type", None),
token=token,
)
use_safetensors = has_remote_safetensors_file
if has_remote_safetensors_file:
# Priority 1: load safetensors weights
filename = hf_hub_download(
model_id,
SAFETENSORS_WEIGHTS_NAME,
**hf_hub_download_kwargs,
)
else:
try:
filename = hf_hub_download(model_id, WEIGHTS_NAME, **hf_hub_download_kwargs)
except EntryNotFoundError:
raise ValueError(
f"Can't find weights for {model_id} in {model_id} or in the Hugging Face Hub. "
f"Please check that the file {WEIGHTS_NAME} or {SAFETENSORS_WEIGHTS_NAME} is present at {model_id}."
)
if use_safetensors:
if hasattr(torch.backends, "mps") and (device == torch.device("mps")):
adapters_weights = safe_load_file(filename, device="cpu")
else:
adapters_weights = safe_load_file(filename, device=device)
else:
adapters_weights = torch.load(filename, map_location=torch.device(device))
return adapters_weights