Aquin SDK

Record your training runs locally and observe them with Aquin — loss curves, learning rate, grad norm, epoch summaries, and web mirror sync via aquin session start + aquin watch.

License

The Aquin CLI and Aquin Engine are proprietary software owned by Aquin Labs Private Limited. Licensor retains all right, title, and interest in the Software; no ownership is transferred to you.

Use requires a valid API key that is personal to you and must not be shared. Licensor grants a limited, non-exclusive, non-transferable, revocable license for your own internal use only. You may not use the Software without an API key, redistribute or sublicense it, reverse engineer it, modify or create derivative works, or use it to build a competing product. API keys may be revoked at any time; upon revocation you must cease all use immediately. You must keep the Software confidential and not disclose it without prior written consent from Aquin Labs. This license terminates automatically on breach, API key revocation, or any attempt to circumvent license enforcement; upon termination you must cease use and destroy all copies. The Software is provided "as is" without warranty; liability is limited to fees paid in the prior twelve months.

Licensing inquiries: aquin@aquin.app, ash@aquin.app — https://aquin.app, aquinlabs.com

See the full AQUIN ENGINE — PROPRIETARY SOFTWARE LICENSE or run:

aquin license

On first use, aquin displays the license and requires you to accept (y) before any other command runs. Non-interactive acceptance after review: aquin --accept-license or AQUIN_LICENSE_ACCEPTED=1.

Install

pip install aquin

Quickstart

import aquin

run = aquin.init(
    base_model="meta-llama/Llama-3.2-1B-Instruct",
    run_name="my-lora-run",
    config={
        "lr": 2e-4, "epochs": 3, "rank": 16, "lora_alpha": 32,
        "method": "qlora", "per_device_train_batch_size": 2,
        "gradient_accumulation_steps": 8, "dataset": "data.jsonl",
    },
)

for epoch in range(3):
    for step, batch in enumerate(dataloader):
        loss = train_step(batch)
        grad_norm = torch.nn.utils.clip_grad_norm_(model.parameters(), 1.0).item()
        run.log(
            step,
            loss=loss.item(),
            learning_rate=scheduler.get_last_lr()[0],
            grad_norm=grad_norm,
            epoch=epoch,
        )

run.checkpoint(model, step=step)
run.finish()

Then replay or sync to the web mirror:

aquin session start --id my-run --model llama-3.2-1b   # register engine + session
aquin watch <run_id>              # local replay / live tail
aquin watch ingest --run <run_id> --file aquin_run/metrics.jsonl

With an active session, watch events appear on the Aquin web mirror in real time.

Post-training SAE (checkpoint diff, temp train, align)

After run.checkpoint() saves aquin_run/checkpoints/checkpoint.pt, run SAE tools on the real merged weights (not simulate's synthetic checkpoint):

aquin session start --id my-run --model llama-3.2-1b
aquin load sae llama-3.2-1b-l8

aquin sae diff --model llama-3.2-1b \
  --checkpoint aquin_run/checkpoints/checkpoint.pt \
  --prompts probes.jsonl --name my-run

aquin sae train --model llama-3.2-1b --layer 8 \
  --checkpoint aquin_run/checkpoints/checkpoint.pt \
  --quick --name my-run

aquin sae align \
  --sae-a ~/.aquin/sae/llama-3.2-1b/sae_layer8.pt \
  --sae-b ~/.aquin/sae/user/llama-3.2-1b/my-run/sae_layer8.pt

Docs: Checkpoint SAE. Watch ingests metrics only; simulate diffs a synthetic NTK checkpoint at forecast end.

API

aquin.init(base_model, run_name, config)

Starts a new run. Creates aquin_run/ in the current directory.

run.log(step, *, loss, ...)

Record metrics for one training step. Call every step inside your loop.

run.checkpoint(model, step)

Saves the model checkpoint locally. One checkpoint per run — always replaces the previous save. Call once at the end of training. Stored under aquin_run/checkpoints/ for local analysis.

run.finish(config)

Flushes all metrics to disk. Pass config here if you didn't pass it to aquin.init().

CLI

aquin login       # save your API key
aquin session start --id <name> --model <id>   # connect engine + load model
aquin watch list  # list observed training runs
aquin sae help    # checkpoint SAE diff / train / align
aquin help        # full command list (mode-filtered)
aquin status      # account, API key, and session state

Using with HuggingFace Trainer / TRL

Use a TrainerCallback to hook into the training loop:

import time
from transformers import TrainerCallback

class AquinCallback(TrainerCallback):
    def __init__(self, run):
        self.run = run
        self._step_start = 0.0

    def on_step_begin(self, args, state, control, **kwargs):
        self._step_start = time.time()

    def on_log(self, args, state, control, logs=None, **kwargs):
        if not logs or "loss" not in logs:
            return
        self.run.log(
            step=state.global_step,
            loss=float(logs["loss"]),
            learning_rate=float(logs["learning_rate"]) if "learning_rate" in logs else None,
            grad_norm=float(logs["grad_norm"]) if "grad_norm" in logs else None,
            epoch=int(state.epoch) if state.epoch is not None else None,
            step_ms=round((time.time() - self._step_start) * 1000),
        )

    def on_train_end(self, args, state, control, **kwargs):
        model = kwargs.get("model")
        if model:
            self.run.checkpoint(model, step=state.global_step)

Building and publishing a new release

Prerequisites: Python 3.13, Nuitka, MSVC (Visual Studio Build Tools with Desktop C++ workload).

1. Compile to native extensions

cd cli
python scripts/build_nuitka.py
# Compiles engine/ + compute/ to .pyd, removes .py source, audits on finish

2. Build the wheel

python -m build --wheel
# Output: dist/aquin-<version>-py3-none-any.whl

3. Audit — confirm no source leaked

python scripts/build_nuitka.py --check
# Must print: Audit passed

4. Bump version before releasing Edit version in pyproject.toml, then repeat steps 1–3.

5. Distribute Send the wheel directly to users (pip install aquin-*.whl) or upload to R2 and share a signed link.

Notes:

• .pyd files and dist/ are gitignored — never commit compiled artifacts
• After building, engine/ and compute/ have no .py source locally either — keep a clean git working tree by running builds in a separate branch or restoring source from git after building
• To rebuild from scratch: git restore cli/aquin/engine cli/aquin/compute then repeat from step 1