clearml-docs/docs/hyperdatasets/custom_metadata.md
2024-03-05 12:00:32 +02:00

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---
title: Custom Metadata
---
Metadata can be customized as needed using: **meta** dictionaries:
* As a top-level key for metadata applying to entire frame
* In `rois` dictionaries, for metadata applying to individual ROIs.
## Usage
### Adding Frame Metadata
When instantiating a `SingleFrame`, metadata that applies to the entire frame can be
added as an argument:
```python
from allegroai import SingleFrame
# create a frame with metadata
frame = SingleFrame(
source='https://allegro-datasets.s3.amazonaws.com/tutorials/000012.jpg',
preview_uri='https://allegro-datasets.s3.amazonaws.com/tutorials/000012.jpg',
# insert metadata dictionary
metadata={'alive':'yes'},
)
# add metadata to the frame
frame.metadata['dangerous'] = 'no'
```
### Adding ROI Metadata
Metadata can be added to individual ROIs when adding an annotation to a `frame`, using [`SingleFrame.add_annotation()`](../references/hyperdataset/singleframe.md#add_annotation):
```python
frame.add_annotation(
box2d_xywh=(10, 10, 30, 20),
labels=['tiger'],
# insert metadata dictionary
metadata={'dangerous':'yes'}
)
```