---
license: apache-2.0
task_categories:
- robotics
tags:
- LeRobot
- so100
- hackathon
- tsfile
- timeseries
modality: [timeseries]
configs:
- config_name: default
  data_files:
  - split: train
    path: data/team13_two_balls_stacking_train.tsfile
---
# Team 13 Two-Balls Stacking (TsFile)

Converted from [`roboticshack/team13-two-balls-stacking`](https://huggingface.co/datasets/roboticshack/team13-two-balls-stacking) at pinned revision [`7df39c37cad86c865ae9194461160824afd46d4a`](https://huggingface.co/datasets/roboticshack/team13-two-balls-stacking/tree/7df39c37cad86c865ae9194461160824afd46d4a). **Modalities: Time-series.**

## Dataset description

This LeRobot v2.1 SO100 dataset records demonstrations of stacking two balls on top of each other.

The pinned task instruction is: “Stack the balls on top of each other.”

- **Source repository owner/publisher:** roboticshack
- **License:** apache-2.0 (declared by the source card).
- **Paper/homepage/citation:** no completed paper, homepage, or citation is documented in the pinned source card unless linked above.

## Dataset Scale

| Split | Episodes | Tasks | Source trajectory Parquets | TsFile rows | Sampling rate | TsFile files/shards |
|---|---:|---:|---:|---:|---:|---:|
| `train` | 51 | 1 | 51 | 13,476 | 30 Hz | 1 |

The staged Parquet has 13,476 rows and 17 columns including `Time`; TsFile chunk metadata independently reports the same 13,476 rows.

## TsFile schema

| Column | Role | TsFile type | Observed/source range |
|---|---|---|---|
| `Time` | TIME | INT64 | 0–11,767 ms; restarts per episode |
| `episode_index` | TAG | STRING | source integer 0–50 |
| `task_index` | TAG | STRING | source integer 0–0 |
| `frame_index` | FIELD | INT64 | 0–353 within an episode |
| `sample_index` | FIELD | INT64 | 0–13,475 globally |

Exact remaining FIELD names/ranges and imported types:

- `action_0`–`action_5` (FLOAT): main shoulder pan/lift, elbow flex, wrist flex/roll, and gripper action
- `observation_state_0`–`observation_state_5` (FLOAT): the corresponding SO100 state

## Conversion

- All source episodes in the train split are merged into `data/team13_two_balls_stacking_train.tsfile`; `episode_index` and `task_index` are TAG dimensions.
- `Time = round(timestamp * 1000)` in milliseconds. The source `timestamp` column is omitted because it is redundant with `Time / 1000` seconds.
- `frame_index` is retained. Source `index` is retained as `sample_index`.
- Every vector is fully flattened: the complete source name is kept, `.` becomes `_`, and element indices are appended. Float vectors are imported as single-precision FLOAT fields.
- Other scalar source columns shown above are retained; no trajectory rows are intentionally dropped.
- Source metadata is mirrored for publication, with copied `meta/info.json` rewritten to describe the converted data path and conversion semantics.

## Video policy

The pinned metadata declares 102 source videos across side and RealSense camera streams. MP4 files were not downloaded or uploaded; they remain in [the pinned source `videos/` tree](https://huggingface.co/datasets/roboticshack/team13-two-balls-stacking/tree/7df39c37cad86c865ae9194461160824afd46d4a/videos).

## Minimal read example

```python
from tsfile import TsFileReader

reader = TsFileReader("data/team13_two_balls_stacking_train.tsfile")
print(reader.get_all_table_schemas().keys())
reader.close()
```

## Source and provenance

- Source dataset: [`roboticshack/team13-two-balls-stacking`](https://huggingface.co/datasets/roboticshack/team13-two-balls-stacking)
- Pinned source revision: [`7df39c37cad86c865ae9194461160824afd46d4a`](https://huggingface.co/datasets/roboticshack/team13-two-balls-stacking/tree/7df39c37cad86c865ae9194461160824afd46d4a)
- Converted artifact: `data/team13_two_balls_stacking_train.tsfile`