docs: polish

docs/en/inference_deployment/whl_deploy_en.md

@@ -25,17 +25,16 @@ PaddleClas supports Python wheel package for prediction. At present, PaddleClas
 
 ## 1. Installation
 
-* installing from pypi
+* **[Recommended]** Installing from PyPI:
 
 ```bash
-pip3 install paddleclas==2.2.1
+pip3 install paddleclas
 ```
 
-* build own whl package and install
+* Please build and install locally if you need to use the develop branch of PaddleClas to experience the latest functions, or need to redevelop based on PaddleClas. The command is as follows:
 
 ```bash
-python3 setup.py bdist_wheel
-pip3 install dist/*
+python3 setup.py install
 ```
 
 <a name="2"></a>

docs/en/installation/install_paddleclas_en.md

@@ -25,14 +25,14 @@ git clone https://gitee.com/paddlepaddle/PaddleClas.git -b develop
 
 ## 2. Install PaddleClas and requirements
 
-It is recommanded that installing from PyPI:
+* **[Recommended]** Installing from PyPI:
 
 ```shell
 pip install paddleclas
 ```
 
-PaddleClas dependencies are listed in file `requirements.txt`, you can use the following command to install the dependencies.
+* Please build and install locally if you need to use the develop branch of PaddleClas to experience the latest functions, or need to redevelop based on PaddleClas. The command is as follows:
 
-```
-pip install --upgrade -r requirements.txt -i https://mirror.baidu.com/pypi/simple
+```shell
+python setup.py install
 ```

docs/zh_CN/inference_deployment/whl_deploy.md

@@ -23,17 +23,16 @@ PaddleClas 支持 Python Whl 包方式进行预测，目前 Whl 包方式仅支
 <a name="1"></a>
 ## 1. 安装 paddleclas
 
-* pip 安装
+* **[推荐]** 直接 pip 安装：
 
 ```bash
-pip3 install paddleclas==2.2.1
+pip3 install paddleclas
 ```
 
-* 本地构建并安装
+* 如需使用 PaddleClas develop 分支体验最新功能，或是需要基于 PaddleClas 进行二次开发，请本地构建安装：
 
 ```bash
-python3 setup.py bdist_wheel
-pip3 install dist/*
+python3 setup.py install
 ```
 
 <a name="2"></a>

docs/zh_CN/installation/install_paddleclas.md

@@ -98,16 +98,16 @@ git clone https://gitee.com/paddlepaddle/PaddleClas.git -b release/2.4
 
 ### 1.3 安装 PaddleClas 及其 Python 依赖库
 
-建议直接从 PyPI 安装 PaddleClas：
+* **[建议]** 直接安装 PaddleClas：
 
 ```shell
 pip install paddleclas
 ```
 
-PaddleClas 的 Python 依赖库在 `requirements.txt` 中给出，可通过如下命令安装：
+* 如需使用 PaddleClas develop 分支体验最新功能，或是需要基于 PaddleClas 进行二次开发，请本地构建安装，命令如下：
 
 ```shell
-pip install --upgrade -r requirements.txt -i https://mirror.baidu.com/pypi/simple
+python setup.py install
 ```
 
 <a name='2'></a>