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import os
import sys
import torch
import transformers
from peft import PeftModel
from transformers import GenerationConfig, LlamaForCausalLM, LlamaTokenizer
from .globals import Global
def get_device():
if torch.cuda.is_available():
return "cuda"
else:
return "cpu"
try:
if torch.backends.mps.is_available():
return "mps"
except: # noqa: E722
pass
device = get_device()
def get_base_model():
load_base_model()
return Global.loaded_base_model
def get_model_with_lora(lora_weights: str = "tloen/alpaca-lora-7b"):
if device == "cuda":
return PeftModel.from_pretrained(
get_base_model(),
lora_weights,
torch_dtype=torch.float16,
)
elif device == "mps":
return PeftModel.from_pretrained(
get_base_model(),
lora_weights,
device_map={"": device},
torch_dtype=torch.float16,
)
else:
return PeftModel.from_pretrained(
get_base_model(),
lora_weights,
device_map={"": device},
)
def get_tokenizer():
load_base_model()
return Global.loaded_tokenizer
def load_base_model():
if Global.loaded_tokenizer is None:
Global.loaded_tokenizer = LlamaTokenizer.from_pretrained(
Global.base_model)
if Global.loaded_base_model is None:
if device == "cuda":
Global.loaded_base_model = LlamaForCausalLM.from_pretrained(
Global.base_model,
load_in_8bit=Global.load_8bit,
torch_dtype=torch.float16,
device_map="auto",
)
elif device == "mps":
Global.loaded_base_model = LlamaForCausalLM.from_pretrained(
Global.base_model,
device_map={"": device},
torch_dtype=torch.float16,
)
else:
model = LlamaForCausalLM.from_pretrained(
base_model, device_map={"": device}, low_cpu_mem_usage=True
)
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