Features Overview
Capabilities
The Snapdragon Neural Processing Engine (SNPE) is a Qualcomm Snapdragon software accelerated runtime for the execution of deep neural networks. With SNPE, users can:
- Execute an arbitrarily deep neural network
- Execute the network on the SnapdragonTM CPU, the AdrenoTM GPU or the HexagonTM DSP.
- Debug the network execution on x86 Ubuntu Linux
- Convert Caffe, Caffe2, ONNXTM and TensorFlowTM models to a SNPE Deep Learning Container (DLC) file
- Quantize DLC files to 8 bit fixed point for running on the Hexagon DSP
- Debug and analyze the performance of the network with SNPE tools
- Integrate a network into applications and other code via C++ or Java
Model Workflow
Model training is performed on a popular deep learning framework (Caffe, Caffe2, ONNX and TensorFlow models are supported by SNPE.) After training is complete the trained model is converted into a DLC file that can be loaded into the SNPE runtime. This DLC file can then be used to perform forward inference passes using one of the Snapdragon accelerated compute cores.
The basic SNPE workflow consists of only a few steps:
- Convert the network model to a DLC file that can be loaded by SNPE.
- Optionally quantize the DLC file for running on the Hexagon DSP.
- Prepare input data for the model.
- Load and execute the model using SNPE runtime.
Supported Snapdragon Devices
| Snapdragon Device | CPU | GPU | DSP | AIP |
|---|---|---|---|---|
| Qualcomm Snapdragon 855 | Yes | Yes | Yes (CDSP) | Yes (CDSP) |
| Qualcomm Snapdragon 845 | Yes | Yes | Yes (CDSP) | No |
| Qualcomm Snapdragon 710 | Yes | Yes | Yes (CDSP) | No |
| Qualcomm Snapdragon 630 | Yes | Yes | No | No |
| Qualcomm Snapdragon 625 | Yes | Yes | No | No |
| Qualcomm Snapdragon 605 | Yes | Yes | Yes (CDSP) | No |
| Qualcomm Snapdragon 450 | Yes | Yes | No | No |
What is included in the SDK
$SNPE_ROOT refers to the base directory where the SDK is installed.
| SDK Asset | Type | Compiler | C++ STL | Description |
|---|---|---|---|---|
| android | lib | - | - | Android aar file used to include SNPE into your application |
| bin/x86_64-linux-clang | binary | clang3.4 | gnustl | x86 Linux binaries |
| bin/arm-android-clang6.0 | binary | clang6.0 | libc++ | ARM Android binaries |
| bin/aarch64-android-clang6.0 | binary | clang6.0 | libc++ | Aarch64 Android binaries |
| bin/arm-linux-gcc4.9sf | binary | gcc4.9 | gnustl | Arm Linux Soft Float binaries |
| bin/aarch64-linux-gcc4.9 | binary | gcc4.9 | gnustl | Aarch64 Linux binaries |
| bin/arm-oe-linux-gcc6.4hf | binary | gcc6.4 | gnustl | Arm Linux Hard Float binaries |
| bin/aarch64-oe-linux-gcc6.4 | binary | gcc6.4 | gnustl | Aarch64 Linux binaries |
| lib/x86_64-linux-clang | lib | clang3.4 | gnustl | x86 Linux libraries |
| lib/arm-android-clang6.0 | lib | clang6.0 | libc++ | ARM Android libraries |
| lib/aarch64-android-clang6.0 | lib | clang6.0 | libc++ | Aarch64 Android libraries |
| lib/dsp | lib | - | - | Hexagon DSP runtime libraries |
| lib/arm-linux-gcc4.9sf | lib | gcc4.9 | gnustl | ARM Linux Soft Float libraries |
| lib/aarch64-linux-gcc4.9 | lib | gcc4.9 | gnustl | Aarch64 Linux libraries |
| lib/arm-oe-linux-gcc6.4hf | lib | gcc6.4 | gnustl | ARM Linux Hard Float libraries |
| lib/aarch64-oe-linux-gcc6.4 | lib | gcc6.4 | gnustl | Aarch64 Linux libraries |
| lib/python | lib | - | - | SNPE python model tools modules |
| include/zdl/SNPE | include dir | - | - | SNPE SDK API header files |
| examples | examples dir | - | - | Source code sample applications in Native C++ and Android Java |
| doc | documents | - | - | User and reference API guide |
| benchmarks | scripts | - | - | Benchmark framework to gather runtime performance data on devices |
| models | resources | - | - | Example neural network models |
| File | Type | Details | Location |
|---|---|---|---|
| envsetup.sh | script | Script to setup various environment variables needed to run SDK tools and binaries | $SNPE_ROOT/bin |
| snpe-caffe-to-dlc | script | Script to convert a Caffe model to a DLC file | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-caffe2-to-dlc | script | Script to convert a Caffe2 model to a DLC file | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-onnx-to-dlc | script | Script to convert a ONNX model to a DLC file | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-tensorflow-to-dlc | script | Script to convert a TensorFlow model to a DLC file | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-dlc-quantize | executable | Used to quantize a DLC file using 8 bit quantization | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-diagview | executable | View SNPE timing output | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe-dlc-info | script | Script to print various DLC file information | $SNPE_ROOT/bin/x86_64-linux-clang |
| snpe_bench.py | script | Script to run DLC model on device and collect benchmark information | $SNPE_ROOT/benchmarks |
| snpe-net-run | executable | Example binary that can run a neural network | $SNPE_ROOT/bin/x86_64-linux-clang $SNPE_ROOT/bin/arm-android-clang6.0 $SNPE_ROOT/bin/aarch64-android-clang6.0 $SNPE_ROOT/bin/arm-linux-gcc4.9sf $SNPE_ROOT/bin/aarch64-linux-gcc4.9 $SNPE_ROOT/bin/aarch64-oe-linux-gcc6.4 $SNPE_ROOT/bin/arm-oe-linux-gcc6.4hf |
| libSNPE.so | library | SNPE runtime for host and device development | $SNPE_ROOT/lib/x86_64-linux-clang $SNPE_ROOT/lib/arm-android-clang6.0 $SNPE_ROOT/lib/aarch64-android-clang6.0 $SNPE_ROOT/lib/arm-linux-gcc4.9sf $SNPE_ROOT/lib/aarch64-linux-gcc4.9 $SNPE_ROOT/lib/aarch64-oe-linux-gcc6.4 $SNPE_ROOT/lib/arm-oe-linux-gcc6.4hf |
| libsymphony-cpu.so | library | Symphony CPU runtime library. | $SNPE_ROOT/lib/x86_64-linux-clang $SNPE_ROOT/lib/arm-linux-gcc4.9sf $SNPE_ROOT/lib/aarch64-linux-gcc4.9 $SNPE_ROOT/lib/aarch64-oe-linux-gcc6.4 $SNPE_ROOT/lib/arm-oe-linux-gcc6.4hf |
| libsymphony-cpu.so | library | Symphony CPU runtime library for Android. | $SNPE_ROOT/lib/arm-android-clang6.0 $SNPE_ROOT/lib/aarch64-android-clang6.0 |
| libsnpe_dsp_domains_v2.so | library | Library for Android DSP runtime loading from the /system partition, for non SDM 820 targets. | $SNPE_ROOT/lib/arm-android-clang6.0 $SNPE_ROOT/lib/aarch64-android-clang6.0 |
| libsnpe_dsp_v65_domains_v2_skel.so | library | Hexagon DSP runtime library for v65 targets. | $SNPE_ROOT/lib/dsp |
| libsnpe_dsp_v66_domains_v2_skel.so | library | Hexagon DSP runtime library for v66 targets. | $SNPE_ROOT/lib/dsp |
| libc++_shared.so | library | Shared STL library implementation. | $SNPE_ROOT/lib/arm-android-clang6.0 $SNPE_ROOT/lib/aarch64-android-clang6.0 |
