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chanshing authored May 3, 2024
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# stepcount

A step-counting model based on self-supervised learning for wrist-worn accelerometer data
A step-counting model based on self-supervised learning for wrist-worn accelerometer data.

The SSL model was pre-trained using the large-scale [UK Biobank Accelerometer Dataset](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0169649), and fine-tuned on the [OxWalk Dataset](https://ora.ox.ac.uk/objects/uuid:19d3cb34-e2b3-4177-91b6-1bad0e0163e7).

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$ stepcount sample.cwa -o /path/to/some/folder/
```

The following output files are created:
The following output files will be generated:

- *Info.json* Summary info, as shown above.
- *Steps.csv* Raw time-series of step counts
- *HourlySteps.csv* Hourly step counts
- *DailySteps.csv* Daily step counts
- *HourlyStepsAdjusted.csv* Like HourlySteps but accounting for missing data (see section below).
- *DailyStepsAdjusted.csv* Like DailySteps but accounting for missing data (see section below).

- *Minutely.csv* Minutely summaries
- *Hourly.csv* Hourly summaries
- *Daily.csv* Daily summaries

### Machine learning model type
By default, the `stepcount` tool employs a self-supervised Resnet18 model to detect walking periods.
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