madcat
98 lines
2.3 KiB
Python
98 lines
2.3 KiB
Python
"""BT-7274 LoRA fine-tune — Qwen2.5-7B-Instruct on RTX 2000 Ada 16GB.
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Usage:
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source /home/madcat/lora-train/bin/activate
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cd /home/madcat/lora-train
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python train.py
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"""
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from unsloth import FastLanguageModel
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from trl import SFTTrainer
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from transformers import TrainingArguments
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from datasets import load_dataset
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# --- Config ---
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MODEL = "unsloth/Qwen2.5-7B-Instruct-bnb-4bit"
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MAX_SEQ = 2048
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RANK = 16
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ALPHA = 16
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DATA = "./bt7274_train.jsonl"
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OUT = "./bt7274-lora"
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EPOCHS = 5
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BATCH = 2
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GRAD_ACCUM = 4 # effective batch = 8
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LR = 2e-4
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# --- Load model (4-bit quantized) ---
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model, tokenizer = FastLanguageModel.from_pretrained(
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model_name=MODEL,
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max_seq_length=MAX_SEQ,
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load_in_4bit=True,
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dtype=None,
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)
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# --- LoRA adapter ---
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model = FastLanguageModel.get_peft_model(
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model,
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r=RANK,
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lora_alpha=ALPHA,
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lora_dropout=0,
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target_modules=[
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"q_proj", "k_proj", "v_proj", "o_proj",
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"gate_proj", "up_proj", "down_proj",
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],
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bias="none",
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use_gradient_checkpointing="unsloth",
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random_state=42,
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)
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# --- Dataset ---
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ds = load_dataset("json", data_files=DATA, split="train")
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def to_chatml(ex):
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text = tokenizer.apply_chat_template(
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ex["conversations"], tokenize=False, add_generation_prompt=False
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)
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return {"text": text}
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ds = ds.map(to_chatml)
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steps = (len(ds) * EPOCHS) // (BATCH * GRAD_ACCUM)
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print(f"Dataset: {len(ds)} examples")
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print(f"Epochs: {EPOCHS}, effective batch: {BATCH * GRAD_ACCUM}")
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print(f"Estimated steps: {steps}")
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print(f"LoRA: r={RANK}, alpha={ALPHA}")
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# --- Train ---
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trainer = SFTTrainer(
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model=model,
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tokenizer=tokenizer,
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train_dataset=ds,
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args=TrainingArguments(
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output_dir=OUT,
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per_device_train_batch_size=BATCH,
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gradient_accumulation_steps=GRAD_ACCUM,
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num_train_epochs=EPOCHS,
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learning_rate=LR,
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bf16=True,
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logging_steps=1,
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save_steps=25,
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save_total_limit=2,
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warmup_steps=5,
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optim="adamw_8bit",
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seed=42,
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report_to="none",
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),
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dataset_text_field="text",
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max_seq_length=MAX_SEQ,
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packing=False,
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)
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trainer.train()
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# --- Save LoRA adapter ---
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model.save_pretrained(OUT)
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tokenizer.save_pretrained(OUT)
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print(f"\nSaved LoRA adapter to {OUT}/")
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print("To merge: model.save_pretrained_merged('bt7274-merged', tokenizer, save_method='merged_16bit')")
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