Qwen3-1.7B-OT3 (1 epoch)

Qwen3-1.7B-OT3-1ep is Qwen3-1.7B-Base fine-tuned on OpenThoughts3-1.2M (the full 1.2M-example long-chain-of-thought SFT set: math, code and science reasoning traces) — an open re-creation of the OpenThinker3 recipe at the 1.7B scale. It is a thinking model: every answer starts with a <think> block. The checkpoint is a general reasoning student that the MMOPD project uses as the starting point for domain teachers and for on-policy distillation experiments.

This repository holds the checkpoint closest to 1 epoch (step 2,200 of 4,312, epoch 1.02; checkpoints were saved every 100 steps) of the run whose final 2-epoch checkpoint is MMOPD/Qwen3-1.7B-OT3-2ep. It has not been benchmarked separately; see the 2-epoch card for the final numbers.

Training

base model Qwen3-1.7B-Base
data OpenThoughts3-1.2M (open-thoughts/OpenThoughts3-1.2M), all 1.2M rows, Qwen3 chat template with thinking
sequence length 18,432 tokens, sequence packing (flatten, no cross-example attention)
epochs 2 (4,312 optimizer steps in total, 2,156 per epoch)
optimizer AdamW, peak LR 8e-5, 5% warmup, global batch 512 packed sequences (about 8.1M tokens per step)
precision bf16 compute, ZeRO-2 data parallel (transformers 4.57 / trl 0.29 / DeepSpeed) on A100-80GB
final train loss 0.953 (at this checkpoint)

Evaluation

Notes

  • Apache-2.0, like the Qwen3 base models and OpenThoughts3.
  • Part of the MMOPD (multi-teacher on-policy distillation) model family: the domain teachers MMOPD/Qwen3-4B-OT3-{medical,law,finance,if} start from MMOPD/Qwen3-4B-OT3-2ep.

How to use

The models keep the Qwen3 chat template and thinking format (<think> ... </think> before the answer). Use enable_thinking=True and sampling (not greedy); the evaluations below used a 32k-token generation budget.

from transformers import AutoModelForCausalLM, AutoTokenizer
repo = "MMOPD/Qwen3-1.7B-OT3-1ep"
tok = AutoTokenizer.from_pretrained(repo)
model = AutoModelForCausalLM.from_pretrained(repo, dtype="auto", device_map="auto")
messages = [{"role": "user", "content": "How many positive integers n < 1000 have the property that n^2 + 1 is divisible by 5?"}]
text = tok.apply_chat_template(messages, tokenize=False, add_generation_prompt=True, enable_thinking=True)
out = model.generate(**tok(text, return_tensors="pt").to(model.device), max_new_tokens=32768,
                     do_sample=True, temperature=0.6, top_p=0.95, top_k=20)
print(tok.decode(out[0], skip_special_tokens=True))

vLLM: vllm serve MMOPD/Qwen3-1.7B-OT3-1ep --max-model-len 40960 (the same sampling settings apply).

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Dataset used to train MMOPD/Qwen3-1.7B-OT3-1ep