# Classify objects using a default model
The *gst-ai-classification* sample application demonstrates the
capability of hardware to perform classification on a video stream.
The pipeline receives the video stream from the camera, file source,
or real-time streaming protocol (RTSP), performs preprocessing,
conducts inference on AI hardware, and displays the results on the
screen.
The *gst-ai-classification* application is part of the Qualcomm
Intelligent Multimedia (QIM) SDK and can be
run directly after flashing the device. You need to push the model
and label files to the device to run the application.
## Download model and label files
Note
The following sections use placeholder model names for models downloaded through AI Hub.
Update the model name in the commands with the appropriate model name as downloaded
through AI Hub.
To download the model and label files directly on the device, follow the steps below.
1. [Enable Wi-Fi](https://docs.qualcomm.com/doc/80-80022-254/topic/how_to.html#connect-to-the-network) and [SSH](https://docs.qualcomm.com/doc/80-80022-254/topic/how_to.html#use-ssh).
>
>
> The device needs an internet connection to download the artifacts required to run sample applications.
> If you have already enabled SSH and connected to the internet with Wi-Fi, skip this step.
2. On the host device, run the following command:
export USER=root
Copy to clipboard
3. Sign in to the target device using SSH:
ssh $USER@
Copy to clipboard
4. On the target device, download the `download_artifacts.sh` script, set executable permissions,
and run it with the required arguments to download the model and label files to the device.
cd /tmp
Copy to clipboard
curl -L -O https://raw.githubusercontent.com/quic/sample-apps-for-qualcomm-linux/refs/heads/main/qualcomm-linux/scripts/download_artifacts.sh
Copy to clipboard
chmod +x download_artifacts.sh
Copy to clipboard
./download_artifacts.sh
Copy to clipboard
5. The YOLOv8 model isn’t available by default (Optional).
Download them using the provided script or export them with AI Hub APIs.
If you are using the `gst-ai-multistream-batch-inference` application,
generate a batch model.
Tab Download them with a script
Tab Export them with AI Hub APIs
Tab Generate a batch model
1. Create a [Qualcomm AI Hub account](https://app.aihub.qualcomm.com/account/).
2. Select the account name > go to **Settings** in the upper right corner > select the API key.
3. Run the following commands on the Linux host:
curl -L -O https://raw.githubusercontent.com/quic/sample-apps-for-qualcomm-linux/refs/heads/main/qualcomm-linux/scripts/export_model.sh
Copy to clipboard
chmod +x export_model.sh
Copy to clipboard
Replace `` with the selected key:
./export_model.sh --api-key=
Copy to clipboard
After executing the script, the models will be downloaded to the `export_assets` directory.
4. Copy the models to the device in the `/etc/models/` directory.
scp /export_assets/yolov8_det-tflite-w8a8/yolov8_det.tflite $USER@:/etc/models/
Copy to clipboard
- [YOLOv8-Detection-Quantized](https://github.com/qualcomm/ai-hub-models/tree/v0.52.0/src/qai_hub_models/models/yolov8_det)
- Current releases use the following SDK versions:
- Qualcomm Linux (2.0.rc3): Qualcomm AI Runtime SDK v2.43.0.260128.
- Ubuntu (x08): Qualcomm AI Runtime SDK 2.43.0.260128
For example, to export the YoloV8 QNN model, run the following command:
python -m qai_hub_models.models.yolov8_det.export --quantize w8a8 --target-runtime=qnn_context_binary --device="Dragonwing RB3 Gen 2 Vision Kit" --compile-options="--qairt_version 2.43" --profile-options "--qairt_version 2.43"
Copy to clipboard
- Update the `--qairt_version` value in the command to match the version installed on your device.
- To check the QAIRT version, run the following command on the target device:
>
>
> qnn-net-run --version
> Copy to clipboard
- To find the QAIRT SDK versions that AIHUB supports for the export command, run the following command on your host machine:
>
>
> qai-hub list-frameworks
> Copy to clipboard
- Run the following command in the AIHUB environment to view the supported devices and update the device parameter accordingly:
>
>
> qai-hub list-devices
> Copy to clipboard
For example, to export the YoloV8 LiteRT model, run the following command:
>
>
> python -m qai_hub_models.models.yolov8_det.export --quantize w8a8 --target-runtime=tflite --device="Dragonwing RB3 Gen 2 Vision Kit"
> Copy to clipboard
To change the batch size of the model, update `` in the following export command:
python -m qai_hub_models.models..export --batch-size --device="Dragonwing RB3 Gen 2 Vision Kit"
Copy to clipboard
For example, run the following command in the Python environment created by export\_model.sh to export the YOLOv8 LiteRT model with –batch-size 4:
python -m qai_hub_models.models.yolov8_det.export --quantize w8a8 --target-runtime=tflite --device="Dragonwing RB3 Gen 2 Vision Kit" --batch-size 4
Copy to clipboard
6. If a model isn’t available after downloading with the script, download it from
[IoT-Qualcomm AI Hub](https://aihub.qualcomm.com/iot/models/) and copy it to the target device by running the following command on the host computer:
scp $USER@:/etc/models
Copy to clipboard
For example:
scp inception_v3_quantized.tflite $USER@:/etc/models
Copy to clipboard
Note
If you want to run sample applications from the UART shell in Qualcomm Linux, remount the file system
with read/write permission using the following command on the target device:
mount -o remount,rw /
Copy to clipboard
## Run the sample application
Important
The rest of this document assumes the following convention for default file locations:
- `/etc/models/` for all model files
- `/etc/labels/` for all label files
- `/etc/media/` for all video files
- `/etc/configs/` for all configuration files
To run the reference application, run the following commands:
1. On the host device, run the following command:
export USER=root
Copy to clipboard
2. The `download_artifacts.sh` script downloads the sample `video.mp4` file to the `/etc/media` directory.
If you wish to use your own video file, push the video file to the `/etc/media` directory using the command
below and update the path in the configuration file.
scp