text-generation-webui/modules/GPTQ_loader.py

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import inspect
import re
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import sys
from pathlib import Path
import accelerate
import torch
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import transformers
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from transformers import AutoConfig, AutoModelForCausalLM
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import modules.shared as shared
sys.path.insert(0, str(Path("repositories/GPTQ-for-LLaMa")))
import llama_inference_offload
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from modelutils import find_layers
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from quant import make_quant
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def _load_quant(model, checkpoint, wbits, groupsize=-1, faster_kernel=False, exclude_layers=['lm_head'], kernel_switch_threshold=128):
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def noop(*args, **kwargs):
pass
config = AutoConfig.from_pretrained(model)
torch.nn.init.kaiming_uniform_ = noop
torch.nn.init.uniform_ = noop
torch.nn.init.normal_ = noop
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torch.set_default_dtype(torch.half)
transformers.modeling_utils._init_weights = False
torch.set_default_dtype(torch.half)
model = AutoModelForCausalLM.from_config(config)
torch.set_default_dtype(torch.float)
model = model.eval()
layers = find_layers(model)
for name in exclude_layers:
if name in layers:
del layers[name]
gptq_args = inspect.getfullargspec(make_quant).args
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make_quant_kwargs = {
'module': model,
'names': layers,
'bits': wbits,
}
if 'groupsize' in gptq_args:
make_quant_kwargs['groupsize'] = groupsize
if 'faster' in gptq_args:
make_quant_kwargs['faster'] = faster_kernel
if 'kernel_switch_threshold' in gptq_args:
make_quant_kwargs['kernel_switch_threshold'] = kernel_switch_threshold
make_quant(**make_quant_kwargs)
del layers
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print('Loading model ...')
if checkpoint.endswith('.safetensors'):
from safetensors.torch import load_file as safe_load
model.load_state_dict(safe_load(checkpoint), strict=False)
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else:
model.load_state_dict(torch.load(checkpoint), strict=False)
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try:
from quant import autotune_warmup, make_quant_attn
# triton branch
make_quant_attn(model)
if not shared.args.no_warmup_autotune:
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autotune_warmup(model)
except ImportError: # not triton branch
pass
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model.seqlen = 2048
print('Done.')
return model
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def load_quantized(model_name):
# Find the model type
if not shared.args.model_type:
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name = model_name.lower()
if any((k in name for k in ['llama', 'alpaca', 'vicuna'])):
model_type = 'llama'
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elif any((k in name for k in ['opt-', 'galactica'])):
model_type = 'opt'
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elif any((k in name for k in ['gpt-j', 'pygmalion-6b'])):
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model_type = 'gptj'
else:
print("Can't determine model type from model name. Please specify it manually using --model_type "
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"argument")
exit()
else:
model_type = shared.args.model_type.lower()
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# Select the appropriate load_quant function
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if shared.args.pre_layer and model_type == 'llama':
load_quant = llama_inference_offload.load_quant
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elif model_type in ('llama', 'opt', 'gptj'):
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if shared.args.pre_layer:
print("Warning: ignoring --pre_layer because it only works for llama model type.")
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load_quant = _load_quant
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else:
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print("Unknown pre-quantized model type specified. Only 'llama', 'opt' and 'gptj' are supported")
exit()
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# Locate the quantized model file
path_to_model = Path(f'{shared.args.model_dir}/{model_name}')
pt_path = None
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priority_name_list = [
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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 [''])
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for ext in ['.safetensors', '.pt']
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for hyphen in ['-', f'/{model_name}-', '/']
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]
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
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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.')
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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.')
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pt_path = found_safetensors[-1]
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if not pt_path:
print("Could not find the quantized model in .pt or .safetensors format, exiting...")
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exit()
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else:
print(f"Found the following quantized model: {pt_path}")
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# qwopqwop200's offload
if model_type == 'llama' and shared.args.pre_layer:
model = load_quant(str(path_to_model), str(pt_path), shared.args.wbits, shared.args.groupsize, shared.args.pre_layer)
else:
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threshold = False if model_type == 'gptj' else 128
model = load_quant(str(path_to_model), str(pt_path), shared.args.wbits, shared.args.groupsize, kernel_switch_threshold=threshold)
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# accelerate offload (doesn't work properly)
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if shared.args.gpu_memory or torch.cuda.device_count() > 1:
if shared.args.gpu_memory:
memory_map = list(map(lambda x: x.strip(), shared.args.gpu_memory))
max_cpu_memory = shared.args.cpu_memory.strip() if shared.args.cpu_memory is not None else '99GiB'
max_memory = {}
for i in range(len(memory_map)):
max_memory[i] = f'{memory_map[i]}GiB' if not re.match('.*ib$', memory_map[i].lower()) else memory_map[i]
max_memory['cpu'] = max_cpu_memory
else:
max_memory = accelerate.utils.get_balanced_memory(model)
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device_map = accelerate.infer_auto_device_map(model, max_memory=max_memory, no_split_module_classes=["LlamaDecoderLayer"])
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print("Using the following device map for the quantized model:", device_map)
# https://huggingface.co/docs/accelerate/package_reference/big_modeling#accelerate.dispatch_model
model = accelerate.dispatch_model(model, device_map=device_map, offload_buffers=True)
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# No offload
elif not shared.args.cpu:
model = model.to(torch.device('cuda:0'))
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return model