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Documentation Index

Fetch the complete documentation index at: https://www.radixark.com/llms.txt

Use this file to discover all available pages before exploring further.

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1. Model Introduction

Qwen3 is the latest generation of Alibaba’s Qwen language model series, available in dense and MoE variants with both Instruct and reasoning-enhanced Thinking editions. Key highlights:
  • Stronger general intelligence: significant improvements in instruction following, logical reasoning, mathematics, science, coding, and tool usage over Qwen2.5.
  • Extended context length: trained for 256 K-token contexts, useful for long-document reasoning and agentic workflows.
  • Flexible deployment options: dense sizes from 0.6 B up to 32 B; this page covers the dense recipes (MoE recipes live in qwen3-moe).
  • Stronger agent interaction: improved tool-use and search-based agent performance.

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2. Supported Variants

ModelHF ID
Qwen3-0.6BQwen/Qwen3-0.6B
Qwen3-1.7BQwen/Qwen3-1.7B
Qwen3-4BQwen/Qwen3-4B
Qwen3-4B-Instruct-2507Qwen/Qwen3-4B-Instruct-2507
Qwen3-8BQwen/Qwen3-8B
Qwen3-14BQwen/Qwen3-14B
Qwen3-32BQwen/Qwen3-32B

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3. Environment Setup

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3.1 Download model + datasets

hf download Qwen/Qwen3-4B --local-dir /root/Qwen3-4B
hf download --repo-type dataset zhuzilin/dapo-math-17k --local-dir /root/dapo-math-17k
hf download --repo-type dataset zhuzilin/aime-2024     --local-dir /root/aime-2024

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3.2 HF → Megatron torch_dist conversion

cd /root/miles
source scripts/models/qwen3-4B.sh
PYTHONPATH=/root/Megatron-LM python tools/convert_hf_to_torch_dist.py \
   ${MODEL_ARGS[@]} \
   --hf-checkpoint /root/Qwen3-4B \
   --save          /root/Qwen3-4B_torch_dist
The converter auto-derives PP from WORLD_SIZE; for larger sizes drive it with torchrun --nproc-per-node 8. The FSDP launcher loads the HF checkpoint directly and skips this step.

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4. Launch

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4.1 Quick start

cd /root/miles
bash scripts/run-qwen3-4B.sh
Other variants follow the same pattern — replace the script name (run-qwen3-32B.sh, run-qwen3-4B-fsdp.sh, etc.) and the qwen3-XB.sh model config. The Qwen3-4B-Instruct-2507 config (scripts/models/qwen3-4B-Instruct-2507.sh) just sets MODEL_ARGS_ROTARY_BASE=5000000 and re-sources qwen3-4B.sh — source it when converting / launching the Instruct-2507 checkpoint.

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5. Recipe Configuration

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5.1 Parallelism

ScriptTPPPCPEPmax_tokens_per_gpuGPUs
run-qwen3-4B.sh211192168 (1 × 8)
run-qwen3-4B_4xgpu.sh211192164 (1 × 4)
run-qwen3-32B.sh8111204808 (1 × 8)
--sequence-parallel is on whenever TP > 1.

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5.2 Algorithm

GRPO baseline across all dense recipes: 
GRPO_ARGS=(
   --advantage-estimator grpo
   --use-kl-loss
   --kl-loss-coef 0.00
   --kl-loss-type low_var_kl
   --entropy-coef 0.00
   --eps-clip 0.2
   --eps-clip-high 0.28
)
Rollout uses --rm-type deepscaler against dapo-math-17k. The SFT recipe (run-qwen3-4B-base-sft.sh) trains on /root/openhermes2_5.parquet.

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5.3 Rollout & SGLang

SGLANG_ARGS=(
   --rollout-num-gpus-per-engine 2
   --sglang-mem-fraction-static 0.7
)
run-qwen3-32B.sh additionally pins --sglang-cuda-graph-bs 1 2 4 8 $(seq 16 8 256). The FSDP variant uses --attn-implementation flash_attention_3, SGLang attention backend fa3, and adds --update-weight-buffer-size 536870912 --gradient-checkpointing.

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5.4 Optimizer

run-qwen3-32B.sh enables CPU Adam: 
--optimizer-cpu-offload
--overlap-cpu-optimizer-d2h-h2d
--use-precision-aware-optimizer
The 4 B / 8 B / 14 B recipes leave Adam on GPU.

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5.5 Notable quirks

  • BF16 train + FP8 inference: run-qwen3-4B.sh ships a commented --hf-checkpoint /root/Qwen3-4B-FP8 alternative — uncomment it (and download Qwen/Qwen3-4B-FP8) to swap rollout to FP8 while keeping BF16 training. See Low Precision RL.
  • FSDP backend: run-qwen3-4B-fsdp.sh runs the same recipe with --train-backend fsdp; no Megatron torch_dist conversion needed.
  • AMD ROCm: scripts/amd/run-qwen3-4B-amd.sh mirrors the recipe with ${NUM_GPUS} resolved from the AMD environment.

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6. Pairs Well With