Models / qwen2
tiny-Qwen2ForCausalLM-2.5: GPU memory to fine-tune
Fine-tuning tiny-Qwen2ForCausalLM-2.5 at batch 1 and 2048 tokens takes about 1.96 GB of GPU memory for a full fine-tune (fits one T4 16 GB), and 1.92 GB with LoRA r=16 on a bf16 base (fits one T4 16 GB). Estimated from the model's structure, not measured. What fits on which card.
Reconstructed from its own config.json
with no weights read. 17.9M downloads on Hugging Face.
Our count against the checkpoint
The left number comes from the graph. The right one is the number of scalars in the published weight files. Nothing on this page was tuned to make them agree.
What it costs to run
Cost is a roofline estimate on the priced GPU for 10 epochs at batch 32, 2048 tokens over 50,000 samples (assumed; no dataset attached).
Memory: what fits on which card
Largest batch per card. Training is sized at 2048 tokens per sample, serving at 4096 tokens per sequence.
| Card | Full fine-tune | LoRA r=16 | Serve bf16, 4096 tokens |
|---|---|---|---|
| T4 16 GB | batch 7 | batch 7 | batch 106108 |
| L4 24 GB | batch 10 | batch 10 | batch 159182 |
| A100 40 GB | batch 18 | batch 18 | batch 265330 |
| A100 / H100 80 GB | batch 36 | batch 36 | batch 530701 |
| H200 141 GB | batch 64 | batch 64 | batch 935390 |
Training: 2048 tokens per sample (2048, or the model's context when shorter; the structure table is at the config's maximum, 32768), AdamW with bf16 autocast, SDPA attention (no score matrix stored), 1.15x headroom on every card. Full fine-tune holds weights, gradients and optimizer state (1.2 x 16 bytes per parameter) plus activations. LoRA is r=16 on every linear layer but the head, base frozen in bf16 (2 bytes per parameter), adapters at full AdamW state, same activations. A two-card split is a contiguous layer cut (pipeline parallel), computed only where one card cannot hold batch 1. Serving: bf16 weights plus the KV cache of 4096 tokens per sequence; prefill working set, CUDA context and framework reserve not counted.
These are estimates from the graph, not measurements. Against measured runs, held out by architecture, the estimate flagged 113 of the 131 jobs that did not fit their card and said "fits" on the other 18. Every measured run.
Structure
18 nodes. Output shapes are propagated from the input shape, batch dimension excluded, at 32768 tokens: the config's maximum context, not the 2048 the memory above is sized at.
| Layer | Type | Output shape | |
|---|---|---|---|
| 1 | Input | Input | 1 × 32768 |
| 2 | Embedding | Embedding | 1 × 32768 × 8 |
| 3 | RoPE | RoPE | 1 × 32768 × 8 |
| 4 | RMSNorm_1_1 | RMSNorm | 1 × 32768 × 8 |
| 5 | Attention_1 | Grouped Query Attn | 1 × 32768 × 8 |
| 6 | Add_1_attn | Add | 1 × 32768 × 8 |
| 7 | RMSNorm_1_2 | RMSNorm | 1 × 32768 × 8 |
| 8 | FFN_1 | SwiGLU | 1 × 32768 × 8 |
| 9 | Add_1_ffn | Add | 1 × 32768 × 8 |
| 10 | RMSNorm_2_1 | RMSNorm | 1 × 32768 × 8 |
| 11 | Attention_2 | Grouped Query Attn | 1 × 32768 × 8 |
| 12 | Add_2_attn | Add | 1 × 32768 × 8 |
| 13 | RMSNorm_2_2 | RMSNorm | 1 × 32768 × 8 |
| 14 | FFN_2 | SwiGLU | 1 × 32768 × 8 |
| 15 | Add_2_ffn | Add | 1 × 32768 × 8 |
| 16 | Final_RMSNorm | RMSNorm | 1 × 32768 × 8 |
| 17 | LM_Head | Linear | 1 × 32768 × 152064 |
| 18 | Output | Output | 1 × 32768 × 152064 |
What the verifier says
No finding on the reconstructed graph. See the checks.
Do this to your own model
Same numbers, on a model in your repo, in one command. No account.
pip install neurarch-trace
neurarch-trace trl-internal-testing/tiny-Qwen2ForCausalLM-2.5 --plan --share