metadata
license: apache-2.0
this is a demo how fine tune phi-2 model.
import torch
import datasets
from transformers import TrainingArguments, AutoConfig, AutoTokenizer, AutoModelForCausalLM
import trl
from transformers import BitsAndBytesConfig
train_dataset = datasets.load_dataset('HuggingFaceTB/cosmopedia-20k', split='train')
args = TrainingArguments(
output_dir="./test-sft",
max_steps=20000,
per_device_train_batch_size=1,
optim="adafactor", report_to="none",
)
model_id = "microsoft/phi-2"
tokenizer = AutoTokenizer.from_pretrained(model_id)
nf4_config = BitsAndBytesConfig(
load_in_4bit=True,
bnb_4bit_quant_type="nf4",
bnb_4bit_use_double_quant=True,
bnb_4bit_compute_dtype=torch.bfloat16
)
model = AutoModelForCausalLM.from_pretrained(model_id, quantization_config=nf4_config,device_map="auto")
print(model)
from peft import LoraConfig
peft_config = LoraConfig(
lora_alpha=16,
lora_dropout=0.1,
r=64, target_modules=["q_proj", "v_proj", "k_proj", "dense", "lm_head", "fc1", "fc2"],
bias="none",
task_type="CAUSAL_LM",
)
model.add_adapter(peft_config)
trainer = trl.SFTTrainer(
model=model,
args=args,
train_dataset=train_dataset,
dataset_text_field='text',
max_seq_length=1024
)
trainer.train()
trainer.model.save_pretrained("sft", dtype=torch.bfloat16)
trainer.tokenizer.save_pretrained("sft")