You may use any of the following two approaches to build the inference library of PaddlePaddle for Raspberry Pi:
1. Build using SSH: Log in to a Raspberry Pi using SSH and build the library. The required development tools and third-party dependencies are listed in here: [`/Dockerfile`](https://github.com/PaddlePaddle/Paddle/blob/develop/Dockerfile).
1. Cross-compile: We talk about how to cross-compile PaddlePaddle for Raspberry Pi on a Linux/x64 machine, in more detail in this article.
## The Cross-Compiling Toolchain
Step 1. Clone the Github repo by running the following command.
Step 2. Use the pre-built cross-compiler found in `./tools/tree/master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64`. To run it on a Linux computer, glibc version >= 2.14 is needed.
## CMake Arguments
CMake supports [cross-compiling](https://cmake.org/cmake/help/v3.0/manual/cmake-toolchains.7.html#cross-compiling). All CMake configuration arguments required for the cross-compilation for Raspberry Pi can be found in [`cmake/cross_compiling/raspberry_pi.cmake`](https://github.com/PaddlePaddle/Paddle/blob/develop/cmake/cross_compiling/raspberry_pi.cmake).
Some important arguments that need to be set:
- `CMAKE_SYSTEM_NAME`: The target platform. Must be `RPi`.
- `RPI_TOOLCHAIN`: The absolute path of the cross-compiling toolchain.
- `RPI_ARM_NEON`: Use ARM NEON Intrinsics. This is a required argument and set default to `ON`.
- `HOST_C/CXX_COMPILER`: The C/C++ compiler for the host. It is used to build building tools running on the host, for example, protoc.
A commonly-used CMake configuration is as follows:
To build the inference library, please set the argument WITH_API to ON: `WITH_C_API=ON`.
You can add more arguments. For example, to minimize the size of the generated inference library, you may use `CMAKE_BUILD_TYPE=MinSizeRel`. For performance optimization, you may use `CMAKE_BUILD_TYPE=Release`.
## Build and Install
The following commands build the inference library of PaddlePaddle for Raspberry Pi and third-party dependencies.
```bash
make
make install
```
The intermediate files will be stored in `build`. Third-party libraries will be located in `build/third_party`. If you have already built it for other platforms like Android or iOS, you may want to clear these directories by running the command: `rm -rf build`.
The infernece library will be in `your/path/to/install/lib`, with related header files in `your/path/to/install/include`.
We sincerely appreciate your contribution. This document explains our workflow and work style.
## Workflow
PaddlePaddle uses this [Git branching model](http://nvie.com/posts/a-successful-git-branching-model/). The following steps guide usual contributions.
1. Fork
Our development community has been growing fastly; it doesn't make sense for everyone to write into the official repo. So, please file Pull Requests from your fork. To make a fork, just head over to the GitHub page and click the ["Fork" button](https://help.github.com/articles/fork-a-repo/).
1. Clone
To make a copy of your fork to your local computers, please run
For daily works like adding a new feature or fixing a bug, please open your feature branch before coding:
```bash
git checkout -b my-cool-stuff
```
1. Commit
Before issuing your first `git commit` command, please install [`pre-commit`](http://pre-commit.com/) by running the following commands:
```bash
pip install pre-commit
pre-commit install
```
Our pre-commit configuration requires clang-format 3.8 for auto-formating C/C++ code and yapf for Python.
Once installed, `pre-commit` checks the style of code and documentation in every commit. We will see something like the following when you run `git commit`:
```
➜ git commit
CRLF end-lines remover...............................(no files to check)Skipped
yapf.................................................(no files to check)Skipped
Check for added large files..............................................Passed
Check for merge conflicts................................................Passed
Check for broken symlinks................................................Passed
Detect Private Key...................................(no files to check)Skipped
Fix End of Files.....................................(no files to check)Skipped
clang-formater.......................................(no files to check)Skipped
[my-cool-stuff c703c041] add test file
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 233
```
1. Build and test
Users can build PaddlePaddle natively on Linux and Mac OS X. But to unify the building environment and to make it easy for debugging, the recommended way is [using Docker](https://github.com/PaddlePaddle/Paddle/blob/develop/doc/howto/dev/build_en.md).
1. Keep pulling
An experienced Git user pulls from the official repo often -- daily or even hourly, so they notice conflicts with others work early, and it's easier to resolve smaller conflicts.
You can "push" your local work into your forked repo:
```bash
git push origin my-cool-stuff
```
The push allows you to create a pull request, requesting owners of this [official repo](https://github.com/PaddlePaddle/Paddle) to pull your change into the official one.
To create a pull request, please follow [these steps](https://help.github.com/articles/creating-a-pull-request/).
If your change is for fixing an issue, please write ["Fixes <issue-URL>"](https://help.github.com/articles/closing-issues-using-keywords/) in the description section of your pull request. Github would close the issue when the owners merge your pull request.
Please remember to specify some reviewers for your pull request. If you don't know who are the right ones, please follow Github's recommendation.
1. Delete local and remote branches
To keep your local workspace and your fork clean, you might want to remove merged branches:
```bash
git push origin :my-cool-stuff
git checkout develop
git pull upstream develop
git branch -d my-cool-stuff
```
### Code Review
- Please feel free to ping your reviewers by sending them the URL of your pull request via IM or email. Please do this after your pull request passes the CI.
- Please answer reviewers' every comment. If you are to follow the comment, please write "Done"; please give a reason otherwise.
- If you don't want your reviewers to get overwhelmed by email notifications, you might reply their comments by [in a batch](https://help.github.com/articles/reviewing-proposed-changes-in-a-pull-request/).
- Reduce the unnecessary commits. Some developers commit often. It is recommended to append a sequence of small changes into one commit by running `git commit --amend` instead of `git commit`.
## Coding Standard
### Code Style
Our C/C++ code follows the [Google style guide](http://google.github.io/styleguide/cppguide.html).
Our Python code follows the [PEP8 style guide](https://www.python.org/dev/peps/pep-0008/).
Our build process helps to check the code style. In [`build.sh`](https://github.com/PaddlePaddle/Paddle/blob/b84e8226514b8bb4405c3c28e54aa5077193d179/paddle/scripts/docker/build.sh#L42), the entry point of our [builder Docker image](https://github.com/PaddlePaddle/Paddle/blob/b84e8226514b8bb4405c3c28e54aa5077193d179/Dockerfile#L88), the CMake argument `WITH_STYLE_CHECK` is set to `ON` by default. This flag is on
Please install pre-commit, which automatically reformat the changes to C/C++ and Python code whenever we run `git commit`. To check the whole codebase, we can run the command `pre-commit run -a`, as in the [`check_style.sh` file](https://github.com/PaddlePaddle/Paddle/blob/b84e8226514b8bb4405c3c28e54aa5077193d179/paddle/scripts/travis/check_style.sh#L30), which is invoked by [our Travis CI configuration](https://github.com/PaddlePaddle/Paddle/blob/b84e8226514b8bb4405c3c28e54aa5077193d179/.travis.yml#L43).
### Unit Tests
Please remember to add related unit tests.
- For C/C++ code, please follow [`google-test` Primer](https://github.com/google/googletest/blob/master/googletest/docs/Primer.md).
- For Python code, please use [Python's standard `unittest` package](http://pythontesting.net/framework/unittest/unittest-introduction/).
### Writing Logs
We use [glog](https://github.com/google/glog) for logging in our C/C++ code.
For general information, please use `LOG`. For debug information, please use [`VLOG`](http://htmlpreview.github.io/?https://github.com/google/glog/blob/master/doc/glog.html#verbose). The reason is at [here](https://groups.google.com/a/chromium.org/d/msg/chromium-dev/3NDNd1KzXeY/AZKMMx37fdQJ).
`VLOG` requires a *verbose level* parameter. For example:
```c++
VLOG(3) << "Operator FC is taking " << num_inputs << "inputs."
```
When we run a PaddlePaddle application or test, we can specify a verbose threshold. For example:
This will enable VLOG messages generated by `buddy_allocator.{h,cc}` and in the verbose range of 0 to 3, so you will see above example VLOG message, which is in level 3. This suggests that we output overall messages in lower verbose levels, so they display with higher probability. When coding C++, please follow the verbose level convention as follows:
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<spanid="build-paddlepaddle-for-raspberry-pi"></span><h1>Build PaddlePaddle for Raspberry Pi<aclass="headerlink"href="#build-paddlepaddle-for-raspberry-pi"title="Permalink to this headline">¶</a></h1>
<p>You may use any of the following two approaches to build the inference library of PaddlePaddle for Raspberry Pi:</p>
<olclass="simple">
<li>Build using SSH: Log in to a Raspberry Pi using SSH and build the library. The required development tools and third-party dependencies are listed in here: <aclass="reference external"href="https://github.com/PaddlePaddle/Paddle/blob/develop/Dockerfile"><codeclass="docutils literal"><spanclass="pre">/Dockerfile</span></code></a>.</li>
<li>Cross-compile: We talk about how to cross-compile PaddlePaddle for Raspberry Pi on a Linux/x64 machine, in more detail in this article.</li>
<spanid="the-cross-compiling-toolchain"></span><h2>The Cross-Compiling Toolchain<aclass="headerlink"href="#the-cross-compiling-toolchain"title="Permalink to this headline">¶</a></h2>
<p>Step 1. Clone the Github repo by running the following command.</p>
<p>Step 2. Use the pre-built cross-compiler found in <codeclass="docutils literal"><spanclass="pre">./tools/tree/master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64</span></code>. To run it on a Linux computer, glibc version >= 2.14 is needed.</p>
</div>
<divclass="section"id="cmake-arguments">
<spanid="cmake-arguments"></span><h2>CMake Arguments<aclass="headerlink"href="#cmake-arguments"title="Permalink to this headline">¶</a></h2>
<p>CMake supports <aclass="reference external"href="https://cmake.org/cmake/help/v3.0/manual/cmake-toolchains.7.html#cross-compiling">cross-compiling</a>. All CMake configuration arguments required for the cross-compilation for Raspberry Pi can be found in <aclass="reference external"href="https://github.com/PaddlePaddle/Paddle/blob/develop/cmake/cross_compiling/raspberry_pi.cmake"><codeclass="docutils literal"><spanclass="pre">cmake/cross_compiling/raspberry_pi.cmake</span></code></a>.</p>
<p>Some important arguments that need to be set:</p>
<ulclass="simple">
<li><codeclass="docutils literal"><spanclass="pre">CMAKE_SYSTEM_NAME</span></code>: The target platform. Must be <codeclass="docutils literal"><spanclass="pre">RPi</span></code>.</li>
<li><codeclass="docutils literal"><spanclass="pre">RPI_TOOLCHAIN</span></code>: The absolute path of the cross-compiling toolchain.</li>
<li><codeclass="docutils literal"><spanclass="pre">RPI_ARM_NEON</span></code>: Use ARM NEON Intrinsics. This is a required argument and set default to <codeclass="docutils literal"><spanclass="pre">ON</span></code>.</li>
<li><codeclass="docutils literal"><spanclass="pre">HOST_C/CXX_COMPILER</span></code>: The C/C++ compiler for the host. It is used to build building tools running on the host, for example, protoc.</li>
</ul>
<p>A commonly-used CMake configuration is as follows:</p>
<p>To build the inference library, please set the argument WITH_API to ON: <codeclass="docutils literal"><spanclass="pre">WITH_C_API=ON</span></code>.</p>
<p>You can add more arguments. For example, to minimize the size of the generated inference library, you may use <codeclass="docutils literal"><spanclass="pre">CMAKE_BUILD_TYPE=MinSizeRel</span></code>. For performance optimization, you may use <codeclass="docutils literal"><spanclass="pre">CMAKE_BUILD_TYPE=Release</span></code>.</p>
</div>
<divclass="section"id="build-and-install">
<spanid="build-and-install"></span><h2>Build and Install<aclass="headerlink"href="#build-and-install"title="Permalink to this headline">¶</a></h2>
<p>The following commands build the inference library of PaddlePaddle for Raspberry Pi and third-party dependencies.</p>
<p>The intermediate files will be stored in <codeclass="docutils literal"><spanclass="pre">build</span></code>. Third-party libraries will be located in <codeclass="docutils literal"><spanclass="pre">build/third_party</span></code>. If you have already built it for other platforms like Android or iOS, you may want to clear these directories by running the command: <codeclass="docutils literal"><spanclass="pre">rm</span><spanclass="pre">-rf</span><spanclass="pre">build</span></code>.</p>
<p>The infernece library will be in <codeclass="docutils literal"><spanclass="pre">your/path/to/install/lib</span></code>, with related header files in <codeclass="docutils literal"><spanclass="pre">your/path/to/install/include</span></code>.</p>
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CMake[支持交叉编译](https://cmake.org/cmake/help/v3.0/manual/cmake-toolchains.7.html#cross-compiling)。PaddlePaddle for Raspberry Pi的配置信息在[cmake/cross_compiling/raspberry_pi.cmake](https://github.com/PaddlePaddle/Paddle/blob/develop/cmake/cross_compiling/raspberry_pi.cmake)。