Property	Value
Base Model	Qwen/Qwen2.5-Coder-1.5B-Instruct
Training Dataset	Naholav/CodeGen-Deep-5K
Training Method	LoRA (Low-Rank Adaptation)
Checkpoint	step-500, epoch-2
Pass@1 (AtCoder Easy)	31.71% (13/41 problems)

Training Configuration

Prompt Style: Think (uses <think> tags for reasoning)
System Prompt: "You are an expert programmer. Use tags for reasoning before writing code."
LoRA Rank: 32
LoRA Alpha: 64
LoRA Dropout: 0.05
Learning Rate: 5e-5

Note: All 4 models were trained with identical hyperparameters for fair comparison. Better configurations may be discovered through hyperparameter search methods (e.g., grid search, random search).

All Models Performance Comparison

Evaluated on LiveCodeBench AtCoder Easy problems (41 questions):

Model	Pass@1	Improvement
Base Model (Qwen2.5-Coder-1.5B)	24.39%	-
deep-instruction	26.83%	+10%
diverse-think	29.27%	+20%
deep-think (this model)	31.71%	+30%
diverse-instruction	31.71%	+30%

Usage

python

from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel
import torch

# Load base model
base_model = AutoModelForCausalLM.from_pretrained(
    "Qwen/Qwen2.5-Coder-1.5B-Instruct",
    torch_dtype=torch.bfloat16,
    device_map="auto"
)

# Load LoRA adapter
model = PeftModel.from_pretrained(base_model, "Naholav/deep-think")

# Load tokenizer
tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen2.5-Coder-1.5B-Instruct")

# Generate with think prompt
messages = [
    {"role": "system", "content": "You are an expert programmer. Use <think> tags for reasoning before writing code."},
    {"role": "user", "content": "Your problem here..."}
]

prompt = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = tokenizer(prompt, return_tensors="pt").to(model.device)
outputs = model.generate(**inputs, max_new_tokens=2048)
print(tokenizer.decode(outputs[0], skip_special_tokens=True))

Resources

GitHub Repository: https://github.com/naholav/CodeGen
Training Dataset: Naholav/CodeGen-Deep-5K

Citation

If you use this model, please cite:

@misc{naholav2024codegen,
  author = {naholav},
  title = {CodeGen: LoRA Fine-tuning for Competitive Programming},
  year = {2025},
  publisher = {HuggingFace},
  url = {https://huggingface.co/Naholav/deep-think}
}