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metadata
library_name: pytorch
license: other
tags:
  - android
pipeline_tag: image-segmentation

FFNet-78S: Optimized for Mobile Deployment

Semantic segmentation for automotive street scenes

FFNet-78S is a "fuss-free network" that segments street scene images with per-pixel classes like road, sidewalk, and pedestrian. Trained on the Cityscapes dataset.

This model is an implementation of FFNet-78S found here.

This repository provides scripts to run FFNet-78S on Qualcomm® devices. More details on model performance across various devices, can be found here.

Model Details

  • Model Type: Model_use_case.semantic_segmentation
  • Model Stats:
    • Model checkpoint: ffnet78S_dBBB_cityscapes_state_dict_quarts
    • Input resolution: 2048x1024
    • Number of output classes: 19
    • Number of parameters: 27.5M
    • Model size (float): 105 MB
    • Model size (w8a8): 26.7 MB
Model Precision Device Chipset Target Runtime Inference Time (ms) Peak Memory Range (MB) Primary Compute Unit Target Model
FFNet-78S float QCS8275 (Proxy) Qualcomm® QCS8275 (Proxy) TFLITE 200.039 ms 2 - 83 MB NPU FFNet-78S.tflite
FFNet-78S float QCS8275 (Proxy) Qualcomm® QCS8275 (Proxy) QNN_DLC 182.656 ms 24 - 91 MB NPU FFNet-78S.dlc
FFNet-78S float QCS8450 (Proxy) Qualcomm® QCS8450 (Proxy) TFLITE 67.447 ms 2 - 133 MB NPU FFNet-78S.tflite
FFNet-78S float QCS8450 (Proxy) Qualcomm® QCS8450 (Proxy) QNN_DLC 77.842 ms 24 - 89 MB NPU FFNet-78S.dlc
FFNet-78S float QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) TFLITE 51.234 ms 2 - 20 MB NPU FFNet-78S.tflite
FFNet-78S float QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) QNN_DLC 40.861 ms 24 - 45 MB NPU FFNet-78S.dlc
FFNet-78S float QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) ONNX 34.196 ms 0 - 106 MB NPU FFNet-78S.onnx.zip
FFNet-78S float QCS9075 (Proxy) Qualcomm® QCS9075 (Proxy) TFLITE 70.051 ms 2 - 82 MB NPU FFNet-78S.tflite
FFNet-78S float QCS9075 (Proxy) Qualcomm® QCS9075 (Proxy) QNN_DLC 58.548 ms 24 - 90 MB NPU FFNet-78S.dlc
FFNet-78S float SA7255P ADP Qualcomm® SA7255P TFLITE 200.039 ms 2 - 83 MB NPU FFNet-78S.tflite
FFNet-78S float SA7255P ADP Qualcomm® SA7255P QNN_DLC 182.656 ms 24 - 91 MB NPU FFNet-78S.dlc
FFNet-78S float SA8255 (Proxy) Qualcomm® SA8255P (Proxy) TFLITE 51.006 ms 2 - 20 MB NPU FFNet-78S.tflite
FFNet-78S float SA8255 (Proxy) Qualcomm® SA8255P (Proxy) QNN_DLC 40.502 ms 24 - 50 MB NPU FFNet-78S.dlc
FFNet-78S float SA8295P ADP Qualcomm® SA8295P TFLITE 76.502 ms 2 - 81 MB NPU FFNet-78S.tflite
FFNet-78S float SA8295P ADP Qualcomm® SA8295P QNN_DLC 63.63 ms 24 - 89 MB NPU FFNet-78S.dlc
FFNet-78S float SA8650 (Proxy) Qualcomm® SA8650P (Proxy) TFLITE 51.018 ms 2 - 23 MB NPU FFNet-78S.tflite
FFNet-78S float SA8650 (Proxy) Qualcomm® SA8650P (Proxy) QNN_DLC 40.681 ms 24 - 45 MB NPU FFNet-78S.dlc
FFNet-78S float SA8775P ADP Qualcomm® SA8775P TFLITE 70.051 ms 2 - 82 MB NPU FFNet-78S.tflite
FFNet-78S float SA8775P ADP Qualcomm® SA8775P QNN_DLC 58.548 ms 24 - 90 MB NPU FFNet-78S.dlc
FFNet-78S float Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile TFLITE 33.979 ms 2 - 131 MB NPU FFNet-78S.tflite
FFNet-78S float Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile QNN_DLC 28.274 ms 24 - 91 MB NPU FFNet-78S.dlc
FFNet-78S float Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile ONNX 24.191 ms 25 - 112 MB NPU FFNet-78S.onnx.zip
FFNet-78S float Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile TFLITE 27.312 ms 1 - 84 MB NPU FFNet-78S.tflite
FFNet-78S float Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile QNN_DLC 21.2 ms 23 - 105 MB NPU FFNet-78S.dlc
FFNet-78S float Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile ONNX 28.974 ms 7 - 72 MB NPU FFNet-78S.onnx.zip
FFNet-78S float Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile TFLITE 22.457 ms 1 - 84 MB NPU FFNet-78S.tflite
FFNet-78S float Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile QNN_DLC 15.777 ms 24 - 113 MB NPU FFNet-78S.dlc
FFNet-78S float Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile ONNX 13.472 ms 30 - 134 MB NPU FFNet-78S.onnx.zip
FFNet-78S float Snapdragon X Elite CRD Snapdragon® X Elite QNN_DLC 41.752 ms 37 - 37 MB NPU FFNet-78S.dlc
FFNet-78S float Snapdragon X Elite CRD Snapdragon® X Elite ONNX 33.978 ms 31 - 31 MB NPU FFNet-78S.onnx.zip
FFNet-78S w8a8 Dragonwing RB3 Gen 2 Vision Kit Qualcomm® QCS6490 TFLITE 51.218 ms 1 - 36 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 Dragonwing RB3 Gen 2 Vision Kit Qualcomm® QCS6490 QNN_DLC 84.569 ms 6 - 289 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Dragonwing RB3 Gen 2 Vision Kit Qualcomm® QCS6490 ONNX 487.386 ms 162 - 230 MB CPU FFNet-78S.onnx.zip
FFNet-78S w8a8 QCS8275 (Proxy) Qualcomm® QCS8275 (Proxy) TFLITE 29.589 ms 1 - 56 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 QCS8275 (Proxy) Qualcomm® QCS8275 (Proxy) QNN_DLC 39.501 ms 6 - 77 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 QCS8450 (Proxy) Qualcomm® QCS8450 (Proxy) TFLITE 12.042 ms 1 - 84 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 QCS8450 (Proxy) Qualcomm® QCS8450 (Proxy) QNN_DLC 20.857 ms 6 - 99 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) TFLITE 10.667 ms 1 - 14 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) QNN_DLC 17.047 ms 6 - 27 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 QCS8550 (Proxy) Qualcomm® QCS8550 (Proxy) ONNX 11.655 ms 0 - 75 MB NPU FFNet-78S.onnx.zip
FFNet-78S w8a8 QCS9075 (Proxy) Qualcomm® QCS9075 (Proxy) TFLITE 11.306 ms 1 - 56 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 QCS9075 (Proxy) Qualcomm® QCS9075 (Proxy) QNN_DLC 17.375 ms 6 - 77 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 RB5 (Proxy) Qualcomm® QCS8250 (Proxy) TFLITE 338.654 ms 1 - 3 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 RB5 (Proxy) Qualcomm® QCS8250 (Proxy) ONNX 504.264 ms 158 - 191 MB CPU FFNet-78S.onnx.zip
FFNet-78S w8a8 SA7255P ADP Qualcomm® SA7255P TFLITE 29.589 ms 1 - 56 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 SA7255P ADP Qualcomm® SA7255P QNN_DLC 39.501 ms 6 - 77 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 SA8255 (Proxy) Qualcomm® SA8255P (Proxy) TFLITE 10.695 ms 1 - 12 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 SA8255 (Proxy) Qualcomm® SA8255P (Proxy) QNN_DLC 17.122 ms 6 - 25 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 SA8295P ADP Qualcomm® SA8295P TFLITE 16.843 ms 1 - 59 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 SA8295P ADP Qualcomm® SA8295P QNN_DLC 23.571 ms 6 - 80 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 SA8650 (Proxy) Qualcomm® SA8650P (Proxy) TFLITE 10.697 ms 1 - 12 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 SA8650 (Proxy) Qualcomm® SA8650P (Proxy) QNN_DLC 16.977 ms 6 - 26 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 SA8775P ADP Qualcomm® SA8775P TFLITE 11.306 ms 1 - 56 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 SA8775P ADP Qualcomm® SA8775P QNN_DLC 17.375 ms 6 - 77 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile TFLITE 7.654 ms 1 - 79 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile QNN_DLC 11.805 ms 6 - 100 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Samsung Galaxy S24 Snapdragon® 8 Gen 3 Mobile ONNX 7.982 ms 6 - 91 MB NPU FFNet-78S.onnx.zip
FFNet-78S w8a8 Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile TFLITE 6.199 ms 1 - 61 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile QNN_DLC 7.96 ms 6 - 87 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Samsung Galaxy S25 Snapdragon® 8 Elite For Galaxy Mobile ONNX 6.173 ms 1 - 71 MB NPU FFNet-78S.onnx.zip
FFNet-78S w8a8 Snapdragon 7 Gen 4 QRD Snapdragon® 7 Gen 4 Mobile TFLITE 16.656 ms 0 - 76 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 Snapdragon 7 Gen 4 QRD Snapdragon® 7 Gen 4 Mobile QNN_DLC 22.082 ms 6 - 99 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Snapdragon 7 Gen 4 QRD Snapdragon® 7 Gen 4 Mobile ONNX 531.424 ms 147 - 164 MB CPU FFNet-78S.onnx.zip
FFNet-78S w8a8 Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile TFLITE 5.406 ms 1 - 61 MB NPU FFNet-78S.tflite
FFNet-78S w8a8 Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile QNN_DLC 5.892 ms 6 - 101 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Snapdragon 8 Elite Gen 5 QRD Snapdragon® 8 Elite Gen5 Mobile ONNX 4.516 ms 7 - 83 MB NPU FFNet-78S.onnx.zip
FFNet-78S w8a8 Snapdragon X Elite CRD Snapdragon® X Elite QNN_DLC 17.759 ms 115 - 115 MB NPU FFNet-78S.dlc
FFNet-78S w8a8 Snapdragon X Elite CRD Snapdragon® X Elite ONNX 12.165 ms 22 - 22 MB NPU FFNet-78S.onnx.zip

Installation

Install the package via pip:

# NOTE: 3.10 <= PYTHON_VERSION < 3.14 is supported.
pip install "qai-hub-models[ffnet-78s]"

Configure Qualcomm® AI Hub Workbench to run this model on a cloud-hosted device

Sign-in to Qualcomm® AI Hub Workbench 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.

qai-hub configure --api_token API_TOKEN

Navigate to 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.

python -m qai_hub_models.models.ffnet_78s.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.ffnet_78s.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.
python -m qai_hub_models.models.ffnet_78s.export

How does this work?

This export script leverages Qualcomm® AI Hub 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.

import torch

import qai_hub as hub
from qai_hub_models.models.ffnet_78s import Model

# Load the model
torch_model = Model.from_pretrained()

# Device
device = hub.Device("Samsung Galaxy S25")

# 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.

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.

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 Workbench. Sign up for access.

Run demo on a cloud-hosted device

You can also run the demo on-device.

python -m qai_hub_models.models.ffnet_78s.demo --eval-mode on-device

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.ffnet_78s.demo -- --eval-mode on-device

Deploying compiled model to Android

The models can be deployed using multiple runtimes:

  • TensorFlow Lite (.tflite export): This tutorial provides a guide to deploy the .tflite model in an Android application.

  • QNN (.so export ): This sample app provides instructions on how to use the .so shared library in an Android application.

View on Qualcomm® AI Hub

Get more details on FFNet-78S's performance across various devices here. Explore all available models on Qualcomm® AI Hub

License

  • The license for the original implementation of FFNet-78S can be found here.
  • The license for the compiled assets for on-device deployment can be found here

References

Community