docs/CONTRIBUTING_EN.md · 陈奕州/PaddleRS

[简体中文](CONTRIBUTING_CN.md) | English

# PaddleRS Contribution Guide

## Contribute Code

This guide starts with the necessary steps to contribute code to PaddleRS, and then goes into details on self-inspection on newly added files, code style specifications, and testing steps.

### 1 Code Contribution Steps

PaddleRS uses [Git](https://git-scm.com/doc) as the version control tool and is hosted on GitHub. This means that you need to be familiar with Git before contributing code. And you need to be familiar with GitHub workflows based on [pull requests (PRs)](https://docs.github.com/cn/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests).

The steps to contribute code to PaddleRS are as follows:

1. Fork the official PaddleRS repository on GitHub, clone the code locally, and pull the develop branch.
2. Write code according to [Dev Guide](dev/dev_guide_en.md) (it is recommended to develop on a new feature branch).
3. Install pre-commit hooks to perform code style checks before each commit. Refer to [code style specifications](#3-code-style-specifications).
4. Write unit tests for the new code and make sure all the tests are successful. Refer to [test related steps](#4-test-related-steps).
5. Create a new PR for your branch and ensure that the CLA is signed and the CI/CE finish with no errors. After that, a PaddleRS team member will review the code you contributed.
6. Modify the code according to the review and resubmit it until PR is merged or closed.

If you contribute code that uses a third-party library that PaddleRS does not currently depends on, please explain when you submit your PR. Also, you should explain why this third-party library need to be used.

### 2 Self-Check on Added Files

Unlike code style specifications, pre-commit hooks do not enforce the rules described in this section, so it is up to the developer to check.

#### 2.1 Copyright Information

```python
# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
```

*Note: The year in copyright information needs to be replaced by the current natural year.*

#### 2.2 Order of Import Statements

All global import statements must be put at the beginning of the module, right after the copyright information. Import packages or modules in the following order:

1. Python standard libraries;
2. Third-party libraries installed through package managers such as `pip` (note that `paddle` is a third-party library, but `paddlers` is not itself a third-party library);
3. `paddlers` and its subpackages and modules.

There should be a blank line between import statements of different types. The file should not contain import statements for unused packages or modules. In addition, if the length of the imported statements varies greatly, you are advised to arrange them in ascending order. An example is shown below:

```python
import os

import numpy as np
import paddle.nn as nn
import paddle.nn.functional as F

import paddlers.transforms as T
from paddlers.transforms import DecodeImg
```

### 3 Code Style Specifications

The code style guidelines of PaddleRS are basically the same as the [Google Python style rules](https://zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/python_style_rules/), except that PaddleRS does not enforce type annotation (i.e. type hints, please refer to [PEP 483](https://peps.python.org/pep-0483/) and [PEP 484](https://peps.python.org/pep-0484/)). Some of the important code style specifications are:

- Blank line: Two empty lines between top-level definitions (such as top-level function or class definitions). There should be a blank line between the definitions of different methods within the class. Inside the function you need to be careful to add a blank line where there is a logical break.

- Line length: No more than 80 characters per line (either code or comment), especially for lines in a docstring.

- Parentheses: Parentheses can be used for line concatenation, but do not use unnecessary parentheses in `if` conditions.

- Exceptions: Throw and catch exceptions with as specific an exception type as possible, and almost never use the base classes `Exception` and `BaseException` (unless the purpose is to catch all exceptions).

- Comments: All comments should be written in English. All APIs provided to users must have docstrings added with at least two parts, function description and function parameters. Surround a docstring with three double quotes `"""`. See the [Code Comment Specification](dev/docstring_en.md) for details on writing docstrings.

- Naming: Variable names of different types apply the following case rules: module name: `module_name`; package name: `package_name`; class name: `ClassName`; method name: `method_name`; function name: `function_name`; name of a global constant (a variable whose value does not change during the running of the program) : `GLOBAL_CONSTANT_NAME`; global variable name: `global_var_name`; instance name: `instance_var_name`; function parameter name: `function_param_name`; local variable name: `local_var_name`.

### 4 Test Related Steps

To ensure code quality, the contributor is required to add unit test cases for the new functional components. Please read the steps according to your contribution.

#### 4.1 Unit Tests for Models

1. Find the test case definition file corresponding to the task of the model in `tests/rs_models/`. For example, the change detection task corresponds to `tests/rs_models/test_cd_models.py`.
2. Define a test class for the new model that inherits from `Test{task name}Model` and sets its `MODEL_CLASS` property to the new model, following the existing examples in the file.
3. Override the new test class's `test_specs()` method. This method sets `self.specs` to a list with each item in the list as a dictionary, whose key-value pairs are used as configuration items for the constructor model. That is, each item in `self.specs` corresponds to a set of test cases, each of which tests the model constructed with a particular set of parameters.

#### 4.2 Unit Tests for Data Preprocessing / Data Augmentation Functions and Operators

- If you are contributing a data preprocessing / augmentation operator (inherited from `paddlers.transforms.operators.Transform`), all the necessary input parameters to construct the operator have default values, and the operator can handle any task and arbitrary number of bands, then you need to add a new method to the `TestTransform` class in the `tests/transforms/test_operators.py`, mimicking the `test_Resize()` or `test_RandomFlipOrRotate()` methods.
- If you are contributing an operator that only supports processing for a specific task or has requirements for the number of bands in the input data, bind the operator with `_InputFilter` in `OP2FILTER`.
- If you are contributing a data preprocessing / data augmentation function (i.e. `paddlers/transforms/functions.py`), add a test class in `tests/transforms/test_functions.py` mimicking the existing example.

#### 4.3 Unit Tests for Tools

1. Create a new file in the `tests/tools/` directory and name it `test_{tool name}.py`.
2. Write the test case in the newly created script.

#### 4.4 Execute the Tests

After adding the test cases, you need to execute all tests in full. Run the following commands:

```bash
cd tests
bash run_tests.sh
```

This process can be time-consuming and requires patience. If some of the test cases fail, modify them based on the error message until all of them pass.

Run the following script to obtain coverage information:

```bash
bash check_coverage.sh
```

#### 4.5 TIPC

If your contribution includes TIPC, please submit your PR with a log indicating successful execution of the TIPC basic training chain.

## Contribute an Example

tbd

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