# Share an Optuna Dashboard — Hyperparameter Results at a URL

Canonical: https://commareports.com/share-optuna-dashboard
Published: 2026-09-12

> optuna-dashboard is a server on localhost. Export the optimization history, importance and parallel-coordinate plots to one HTML file and publish it to Comma so the sweep is reviewable at a link.

# Share an Optuna dashboard

A sweep produces exactly one interesting sentence — _learning rate mattered,
the rest was noise_ — and the evidence for it is three Plotly figures inside a
local dashboard nobody else can reach.

## Concatenate the three plots into one file

```python
import optuna
from optuna.visualization import (
    plot_optimization_history, plot_param_importances, plot_parallel_coordinate,
)

study = optuna.load_study(study_name="lr-sweep", storage="sqlite:///study.db")

figs = [
    plot_optimization_history(study),
    plot_param_importances(study),
    plot_parallel_coordinate(study),
]

with open("optuna.html", "w") as f:
    for i, fig in enumerate(figs):
        f.write(fig.to_html(
            full_html=(i == 0),
            include_plotlyjs="inline" if i == 0 else False,
        ))
```

Inline plotly.js once, on the first figure only — that is what keeps the page
[self-contained](/glossary/self-contained-html) without tripling its size.

Drag the result into [the app](https://commareports.com/), or publish from the
sweep job:

```bash
curl -fsS -X PATCH "https://commareports.com/api/v1/reports/$REPORT_ID" \
  -H "Authorization: Bearer $COMMA_API_TOKEN" \
  -H "Content-Type: application/json" \
  -d "$(jq -n --rawfile html optuna.html \
        --arg title "lr-sweep — $(date +%F)" '{title: $title, html: $html}')"
```

## Why it beats pasting the best params

The best trial is a line of JSON. Whether to trust it depends on the shape of
the search — whether the optimum sits on a boundary, whether importance is
concentrated, whether half the trials pruned early. That is what the plots
show, and what a thread can be attached to:

- **Anchored threads** — "the best value is at the edge of the range, widen
  it" sits on the plot. See [commenting on HTML](/comment-on-html).
- **Revisions** — one report id per study; every publish is kept.
- **Access per report** — private, team-only, or domain-gated. See the
  [sharing model](/docs/sharing).

## Limits

- **Entry HTML: 5 MB.** Inlined plotly.js is roughly 3 MB; a study with tens of
  thousands of trials should be filtered before plotting parallel coordinates.
- **Assets: 25 MB per file, 250 MB and 500 files per report.**
- **60 requests/minute per token.**

## Try it

Comma is free — unlimited reports, unlimited commenters, unlimited revision
history.

**[Publish a sweep report →](https://commareports.com/)**

### Related

- [Share a TensorBoard report](/share-tensorboard-report) · [Share a W&B report](/share-wandb-report)
- [Share an MLflow report](/share-mlflow-report) · [Share a Plotly HTML chart](/share-plotly-html)
- [Share a benchmark report](/share-benchmark-report) · [For data scientists](/for/data-scientists)