Add 4-bit LoRA support (#1200)

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oobabooga 2023-04-16 23:26:52 -03:00 committed by GitHub
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commit 39099663a0
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7 changed files with 100 additions and 34 deletions

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@ -237,6 +237,7 @@ Optionally, you can use the following command-line flags:
| `--groupsize GROUPSIZE` | GPTQ: Group size. |
| `--pre_layer PRE_LAYER` | GPTQ: The number of layers to allocate to the GPU. Setting this parameter enables CPU offloading for 4-bit models. |
| `--no-warmup_autotune` | GPTQ: Disable warmup autotune for triton. |
| `--monkey-patch` | GPTQ: Apply the monkey patch for using LoRAs with quantized models. |
#### FlexGen

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@ -16,6 +16,8 @@ from modelutils import find_layers
from quant import make_quant
# This function is a replacement for the load_quant function in the
# GPTQ-for_LLaMa repository. It supports more models and branches.
def _load_quant(model, checkpoint, wbits, groupsize=-1, faster_kernel=False, exclude_layers=['lm_head'], kernel_switch_threshold=128):
def noop(*args, **kwargs):
@ -64,6 +66,7 @@ def _load_quant(model, checkpoint, wbits, groupsize=-1, faster_kernel=False, exc
try:
from quant import autotune_warmup, make_quant_attn
# triton branch
make_quant_attn(model)
if not shared.args.no_warmup_autotune:
@ -77,6 +80,41 @@ def _load_quant(model, checkpoint, wbits, groupsize=-1, faster_kernel=False, exc
return model
# Used to locate the .pt/.safetensors quantized file
def find_quantized_model_file(model_name):
path_to_model = Path(f'{shared.args.model_dir}/{model_name}')
pt_path = None
priority_name_list = [
Path(f'{shared.args.model_dir}/{model_name}{hyphen}{shared.args.wbits}bit{group}{ext}')
for group in ([f'-{shared.args.groupsize}g', ''] if shared.args.groupsize > 0 else [''])
for ext in ['.safetensors', '.pt']
for hyphen in ['-', f'/{model_name}-', '/']
]
for path in priority_name_list:
if path.exists():
pt_path = path
break
# If the model hasn't been found with a well-behaved name, pick the last .pt
# or the last .safetensors found in its folder as a last resort
if not pt_path:
found_pts = list(path_to_model.glob("*.pt"))
found_safetensors = list(path_to_model.glob("*.safetensors"))
pt_path = None
if len(found_pts) > 0:
if len(found_pts) > 1:
print('Warning: more than one .pt model has been found. The last one will be selected. It could be wrong.')
pt_path = found_pts[-1]
elif len(found_safetensors) > 0:
if len(found_pts) > 1:
print('Warning: more than one .safetensors model has been found. The last one will be selected. It could be wrong.')
pt_path = found_safetensors[-1]
return pt_path
# The function that loads the model in modules/models.py
def load_quantized(model_name):
# Find the model type
@ -106,37 +144,9 @@ def load_quantized(model_name):
print("Unknown pre-quantized model type specified. Only 'llama', 'opt' and 'gptj' are supported")
exit()
# Locate the quantized model file
# Find the quantized model weights file (.pt/.safetensors)
path_to_model = Path(f'{shared.args.model_dir}/{model_name}')
pt_path = None
priority_name_list = [
Path(f'{shared.args.model_dir}/{model_name}{hyphen}{shared.args.wbits}bit{group}{ext}')
for group in ([f'-{shared.args.groupsize}g', ''] if shared.args.groupsize > 0 else [''])
for ext in ['.safetensors', '.pt']
for hyphen in ['-', f'/{model_name}-', '/']
]
for path in priority_name_list:
if path.exists():
pt_path = path
break
# If the model hasn't been found with a well-behaved name, pick the last .pt
# or the last .safetensors found in its folder as a last resort
if not pt_path:
path_to_model = Path(f'{shared.args.model_dir}/{model_name}')
found_pts = list(path_to_model.glob("*.pt"))
found_safetensors = list(path_to_model.glob("*.safetensors"))
pt_path = None
if len(found_pts) > 0:
if len(found_pts) > 1:
print('Warning: more than one .pt model has been found. The last one will be selected. It could be wrong.')
pt_path = found_pts[-1]
elif len(found_safetensors) > 0:
if len(found_pts) > 1:
print('Warning: more than one .safetensors model has been found. The last one will be selected. It could be wrong.')
pt_path = found_safetensors[-1]
pt_path = find_quantized_model_file(model_name)
if not pt_path:
print("Could not find the quantized model in .pt or .safetensors format, exiting...")
exit()

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@ -43,6 +43,7 @@ def add_lora_to_model(lora_names):
shared.model.load_adapter(Path(f"{shared.args.lora_dir}/{lora}"), lora)
if not shared.args.load_in_8bit and not shared.args.cpu:
if not shared.args.monkey_patch:
shared.model.half()
if not hasattr(shared.model, "hf_device_map"):
if torch.has_mps:

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@ -101,6 +101,17 @@ def load_model(model_name):
# Quantized model
elif shared.args.wbits > 0:
# Monkey patch
if shared.args.monkey_patch:
print("Warning: applying the monkey patch for using LoRAs in 4-bit mode.\nIt may cause undefined behavior outside its intended scope.")
from modules.monkey_patch_gptq_lora import load_model_llama
model, tokenizer = load_model_llama(model_name)
return model, tokenizer
# No monkey patch
else:
from modules.GPTQ_loader import load_quantized
model = load_quantized(model_name)

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@ -0,0 +1,41 @@
# Copied from https://github.com/johnsmith0031/alpaca_lora_4bit
import sys
from pathlib import Path
sys.path.insert(0, str(Path("repositories/alpaca_lora_4bit")))
import autograd_4bit
from autograd_4bit import (Autograd4bitQuantLinear,
load_llama_model_4bit_low_ram)
from monkeypatch.peft_tuners_lora_monkey_patch import (
Linear4bitLt, replace_peft_model_with_gptq_lora_model)
from modules import shared
from modules.GPTQ_loader import find_quantized_model_file
replace_peft_model_with_gptq_lora_model()
def load_model_llama(model_name):
config_path = str(Path(f'{shared.args.model_dir}/{model_name}'))
model_path = str(find_quantized_model_file(model_name))
model, tokenizer = load_llama_model_4bit_low_ram(config_path, model_path, groupsize=shared.args.groupsize, is_v1_model=False)
for n, m in model.named_modules():
if isinstance(m, Autograd4bitQuantLinear) or isinstance(m, Linear4bitLt):
if m.is_v1_model:
m.zeros = m.zeros.half()
m.scales = m.scales.half()
m.bias = m.bias.half()
autograd_4bit.use_new = True
autograd_4bit.auto_switch = True
try:
tokenizer.eos_token_id = 2
tokenizer.bos_token_id = 1
tokenizer.pad_token_id = 0
except:
pass
return model, tokenizer

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@ -124,6 +124,7 @@ parser.add_argument('--model_type', type=str, help='GPTQ: Model type of pre-quan
parser.add_argument('--groupsize', type=int, default=-1, help='GPTQ: Group size.')
parser.add_argument('--pre_layer', type=int, default=0, help='GPTQ: The number of layers to allocate to the GPU. Setting this parameter enables CPU offloading for 4-bit models.')
parser.add_argument('--no-warmup_autotune', action='store_true', help='GPTQ: Disable warmup autotune for triton.')
parser.add_argument('--monkey-patch', action='store_true', help='GPTQ: Apply the monkey patch for using LoRAs with quantized models.')
# FlexGen
parser.add_argument('--flexgen', action='store_true', help='Enable the use of FlexGen offloading.')

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@ -1,7 +1,8 @@
accelerate==0.18.0
colorama
datasets
flexgen==0.1.7
gradio==3.25
gradio==3.25.0
markdown
numpy
Pillow>=9.5.0