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README.md

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+---
+library_name: pytorch
+license: bsd-3-clause
+tags:
+- android
+pipeline_tag: unconditional-image-generation
+
+---
+
+![](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/models/simple_bev_cam/web-assets/model_demo.png)
+
+# Simple-Bev: Optimized for Mobile Deployment
+## Construct a bird’s eye view from sensors mounted on a vehicle
+
+
+Simple_bev is a machine learning model for generating a birds eye view represenation from the sensors(cameras) mounted on a vehicle. It uses the ResNet-101 as the backbone and segnet as a segmentation model for specific use cases.
+
+This model is an implementation of Simple-Bev found [here](https://github.com/aharley/simple_bev/blob/main/nets/segnet.py).
+
+
+This repository provides scripts to run Simple-Bev on Qualcomm® devices.
+More details on model performance across various devices, can be found
+[here](https://aihub.qualcomm.com/models/simple_bev_cam).
+
+
+### Model Details
+
+- **Model Type:** Image generation
+- **Model Stats:**
+  - Model checkpoint: model-000025000.pth
+  - Input resolution: 448 x 800
+  - Number of parameters: 42M
+  - Model size: 505 MB
+
+| Model | Device | Chipset | Target Runtime | Inference Time (ms) | Peak Memory Range (MB) | Precision | Primary Compute Unit | Target Model
+|---|---|---|---|---|---|---|---|---|
+| Simple-Bev | Samsung Galaxy S23 | Snapdragon® 8 Gen 2 | QNN | 434.009 ms | 25 - 27 MB | FP16 | NPU | [Simple-Bev.so](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.so) |
+| Simple-Bev | Samsung Galaxy S23 | Snapdragon® 8 Gen 2 | ONNX | 360.438 ms | 57 - 272 MB | FP16 | NPU | [Simple-Bev.onnx](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.onnx) |
+| Simple-Bev | Samsung Galaxy S24 | Snapdragon® 8 Gen 3 | QNN | 301.869 ms | 25 - 40 MB | FP16 | NPU | [Simple-Bev.so](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.so) |
+| Simple-Bev | Samsung Galaxy S24 | Snapdragon® 8 Gen 3 | ONNX | 261.626 ms | 142 - 801 MB | FP16 | NPU | [Simple-Bev.onnx](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.onnx) |
+| Simple-Bev | Snapdragon 8 Elite QRD | Snapdragon® 8 Elite | TFLITE | 16130.835 ms | 0 - 1215 MB | FP16 | NPU | [Simple-Bev.tflite](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.tflite) |
+| Simple-Bev | Snapdragon 8 Elite QRD | Snapdragon® 8 Elite | QNN | 362.952 ms | 25 - 1013 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | Snapdragon 8 Elite QRD | Snapdragon® 8 Elite | ONNX | 223.613 ms | 130 - 837 MB | FP16 | NPU | [Simple-Bev.onnx](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.onnx) |
+| Simple-Bev | SA7255P ADP | SA7255P | QNN | 10837.745 ms | 23 - 31 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | SA8255 (Proxy) | SA8255P Proxy | QNN | 433.305 ms | 25 - 27 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | SA8295P ADP | SA8295P | TFLITE | 1852.028 ms | 1248 - 2589 MB | FP32 | CPU | [Simple-Bev.tflite](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.tflite) |
+| Simple-Bev | SA8295P ADP | SA8295P | QNN | 607.673 ms | 25 - 35 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | SA8650 (Proxy) | SA8650P Proxy | QNN | 435.088 ms | 25 - 28 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | SA8775P ADP | SA8775P | QNN | 701.224 ms | 25 - 31 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | QCS8275 (Proxy) | QCS8275 Proxy | QNN | 10837.745 ms | 23 - 31 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | QCS8550 (Proxy) | QCS8550 Proxy | QNN | 431.407 ms | 25 - 28 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | QCS9075 (Proxy) | QCS9075 Proxy | QNN | 701.224 ms | 25 - 31 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | QCS8450 (Proxy) | QCS8450 Proxy | QNN | 644.8 ms | 3 - 686 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | Snapdragon X Elite CRD | Snapdragon® X Elite | QNN | 425.896 ms | 25 - 25 MB | FP16 | NPU | Use Export Script |
+| Simple-Bev | Snapdragon X Elite CRD | Snapdragon® X Elite | ONNX | 428.555 ms | 265 - 265 MB | FP16 | NPU | [Simple-Bev.onnx](https://huggingface.co/qualcomm/Simple-Bev/blob/main/Simple-Bev.onnx) |
+
+
+
+
+## Installation
+
+
+Install the package via pip:
+```bash
+pip install qai-hub-models
+```
+
+
+## Configure Qualcomm® AI Hub to run this model on a cloud-hosted device
+
+Sign-in to [Qualcomm® AI Hub](https://app.aihub.qualcomm.com/) with your
+Qualcomm® ID. Once signed in navigate to `Account -> Settings -> API Token`.
+
+With this API token, you can configure your client to run models on the cloud
+hosted devices.
+```bash
+qai-hub configure --api_token API_TOKEN
+```
+Navigate to [docs](https://app.aihub.qualcomm.com/docs/) for more information.
+
+
+
+## Demo off target
+
+The package contains a simple end-to-end demo that downloads pre-trained
+weights and runs this model on a sample input.
+
+```bash
+python -m qai_hub_models.models.simple_bev_cam.demo
+```
+
+The above demo runs a reference implementation of pre-processing, model
+inference, and post processing.
+
+**NOTE**: If you want running in a Jupyter Notebook or Google Colab like
+environment, please add the following to your cell (instead of the above).
+```
+%run -m qai_hub_models.models.simple_bev_cam.demo
+```
+
+
+### Run model on a cloud-hosted device
+
+In addition to the demo, you can also run the model on a cloud-hosted Qualcomm®
+device. This script does the following:
+* Performance check on-device on a cloud-hosted device
+* Downloads compiled assets that can be deployed on-device for Android.
+* Accuracy check between PyTorch and on-device outputs.
+
+```bash
+python -m qai_hub_models.models.simple_bev_cam.export
+```
+```
+Profiling Results
+------------------------------------------------------------
+Simple-Bev
+Device                          : Samsung Galaxy S23 (13)
+Runtime                         : QNN                    
+Estimated inference time (ms)   : 434.0                  
+Estimated peak memory usage (MB): [25, 27]               
+Total # Ops                     : 376                    
+Compute Unit(s)                 : NPU (376 ops)          
+```
+
+
+## How does this work?
+
+This [export script](https://aihub.qualcomm.com/models/simple_bev_cam/qai_hub_models/models/Simple-Bev/export.py)
+leverages [Qualcomm® AI Hub](https://aihub.qualcomm.com/) to optimize, validate, and deploy this model
+on-device. Lets go through each step below in detail:
+
+Step 1: **Compile model for on-device deployment**
+
+To compile a PyTorch model for on-device deployment, we first trace the model
+in memory using the `jit.trace` and then call the `submit_compile_job` API.
+
+```python
+import torch
+
+import qai_hub as hub
+from qai_hub_models.models.simple_bev_cam import Model
+
+# Load the model
+torch_model = Model.from_pretrained()
+
+# Device
+device = hub.Device("Samsung Galaxy S24")
+
+# Trace model
+input_shape = torch_model.get_input_spec()
+sample_inputs = torch_model.sample_inputs()
+
+pt_model = torch.jit.trace(torch_model, [torch.tensor(data[0]) for _, data in sample_inputs.items()])
+
+# Compile model on a specific device
+compile_job = hub.submit_compile_job(
+    model=pt_model,
+    device=device,
+    input_specs=torch_model.get_input_spec(),
+)
+
+# Get target model to run on-device
+target_model = compile_job.get_target_model()
+
+```
+
+
+Step 2: **Performance profiling on cloud-hosted device**
+
+After compiling models from step 1. Models can be profiled model on-device using the
+`target_model`. Note that this scripts runs the model on a device automatically
+provisioned in the cloud.  Once the job is submitted, you can navigate to a
+provided job URL to view a variety of on-device performance metrics.
+```python
+profile_job = hub.submit_profile_job(
+    model=target_model,
+    device=device,
+)
+        
+```
+
+Step 3: **Verify on-device accuracy**
+
+To verify the accuracy of the model on-device, you can run on-device inference
+on sample input data on the same cloud hosted device.
+```python
+input_data = torch_model.sample_inputs()
+inference_job = hub.submit_inference_job(
+    model=target_model,
+    device=device,
+    inputs=input_data,
+)
+    on_device_output = inference_job.download_output_data()
+
+```
+With the output of the model, you can compute like PSNR, relative errors or
+spot check the output with expected output.
+
+**Note**: This on-device profiling and inference requires access to Qualcomm®
+AI Hub. [Sign up for access](https://myaccount.qualcomm.com/signup).
+
+
+
+
+## Deploying compiled model to Android
+
+
+The models can be deployed using multiple runtimes:
+- TensorFlow Lite (`.tflite` export): [This
+  tutorial](https://www.tensorflow.org/lite/android/quickstart) provides a
+  guide to deploy the .tflite model in an Android application.
+
+
+- QNN (`.so` export ): This [sample
+  app](https://docs.qualcomm.com/bundle/publicresource/topics/80-63442-50/sample_app.html)
+provides instructions on how to use the `.so` shared library  in an Android application.
+
+
+## View on Qualcomm® AI Hub
+Get more details on Simple-Bev's performance across various devices [here](https://aihub.qualcomm.com/models/simple_bev_cam).
+Explore all available models on [Qualcomm® AI Hub](https://aihub.qualcomm.com/)
+
+
+## License
+* The license for the original implementation of Simple-Bev can be found
+  [here](https://github.com/aharley/simple_bev/blob/main/LICENSE).
+* The license for the compiled assets for on-device deployment can be found [here](https://qaihub-public-assets.s3.us-west-2.amazonaws.com/qai-hub-models/Qualcomm+AI+Hub+Proprietary+License.pdf)
+
+
+
+## References
+* [Simple-BEV: What Really Matters for Multi-Sensor BEV Perception?](https://arxiv.org/abs/2206.07959)
+* [Source Model Implementation](https://github.com/aharley/simple_bev/blob/main/nets/segnet.py)
+
+
+
+## Community
+* Join [our AI Hub Slack community](https://aihub.qualcomm.com/community/slack) to collaborate, post questions and learn more about on-device AI.
+* For questions or feedback please [reach out to us](mailto:[email protected]).
+
+