SFT-finetuned Qwen/Qwen3-4B-Instruct-2507 on the verifier subset of Divij/qwen3-32b-mas-traces, which contains traces of Qwen3-32B acting as a verifier agent in a multi-agent system. This model is the distilled student that learns to play the same role as Qwen3-32B in that pipeline.

Branches

Branch	Epochs trained	Notes
`main`	2	final

Training configuration

Base model: Qwen/Qwen3-4B-Instruct-2507
Dataset: Divij/qwen3-32b-mas-traces (config verifier)
Loss: assistant-only (system + user tokens masked)
Optimizer: AdamW (β=(0.9, 0.95), wd=0.01, eps=1e-8)
Learning rate: 1e-5, constant with 3% warmup
Sequence length: 8192 (sequence packing on)
Precision: bf16
Hardware: 8× H100 80GB, DDP
Liger-Kernel: on (chunked CE + fused RMSNorm)

Inference

python

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

repo = "STEVENZHANG904/Qwen3-4B-Instruct-2507-verifier-sft"
tok = AutoTokenizer.from_pretrained(repo)
model = AutoModelForCausalLM.from_pretrained(repo, dtype=torch.bfloat16, device_map="cuda")

# Verifier role expects a task-spec prompt — see the dataset card for the exact format.
messages = [
    {"role": "system", "content": "You are a helpful, creative, and smart assistant."},
    {"role": "user", "content": "<your verifier task spec here>"},
]
inputs = tok.apply_chat_template(messages, return_tensors="pt", add_generation_prompt=True).to("cuda")
out = model.generate(
    inputs, max_new_tokens=4096,
    do_sample=True, temperature=0.6, top_p=0.95,  # Qwen3 thinking-mode defaults
)
print(tok.decode(out[0][inputs.shape[-1]:], skip_special_tokens=True))

The model emits <think>...</think> reasoning blocks (inherited from Qwen3-32B traces). Use sampling, not greedy decoding — small distilled models can loop in <think> under greedy.