add baidu_language_recognition module (#1984)

* add baidu_language_recognition module

* fix

* fix doc

* fix

* fix doc
Co-authored-by: Nwuzewu <wuzewu@baidu.com>
Co-authored-by: jm12138 <2286040843@qq.com>

modules/text/machine_translation/baidu_language_recognition/README.md

+# baidu_language_recognition
+|模型名称|baidu_language_recognition|
+| :--- | :---: |
+|类别|文本-语种识别|
+|网络|-|
+|数据集|-|
+|是否支持Fine-tuning|否|
+|模型大小|-|
+|最新更新日期|2022-09-01|
+|数据指标|-|
+
+## 一、模型基本信息
+
+- ### 模型介绍
+
+  - 本模块提供百度翻译开放平台的服务，可支持语种识别。您只需要通过传入文本内容，就可以得到识别出来的语种类别。
+
+## 二、安装
+
+- ### 1、环境依赖  
+
+  - paddlepaddle >= 2.1.0
+
+  - paddlehub >= 2.3.0    | [如何安装PaddleHub](../../../../docs/docs_ch/get_start/installation.rst)
+
+- ### 2、安装
+
+  - ```shell
+    $ hub install baidu_language_recognition
+    ```
+  - 如您安装时遇到问题，可参考：[零基础windows安装](../../../../docs/docs_ch/get_start/windows_quickstart.md)
+ | [零基础Linux安装](../../../../docs/docs_ch/get_start/linux_quickstart.md) | [零基础MacOS安装](../../../../docs/docs_ch/get_start/mac_quickstart.md)
+
+## 三、模型API预测
+
+- ### 1、预测代码示例
+
+  - ```python
+    import paddlehub as hub
+
+    module = hub.Module(name='baidu_language_recognition')
+    result = module.recognize("I like panda")
+    print(result)
+    ```
+
+- ### 2、API
+
+  - ```python
+    def recognize(query: str)
+    ```
+
+    - 语种识别API，输入文本句子，输出识别后的语种编码。
+
+    - **参数**
+
+      - `query`(str): 待识别的语言。
+
+    - **返回**
+
+      - `result`(str): 识别的结果，语言的ISO 639-1编码。
+
+  目前支持识别的语种如下：
+    <p align="center">
+    <img src="https://user-images.githubusercontent.com/22424850/188105543-21610399-23de-471b-ab60-82c3e95660a6.png"  width = "80%" hspace='10'/>
+
+## 四、服务部署
+
+- 通过启动PaddleHub Serving，可以加载模型部署在线语种识别服务。
+
+- ### 第一步：启动PaddleHub Serving
+
+  - 运行启动命令：
+
+  - ```shell
+    $ hub serving start -m baidu_language_recognition
+    ```
+
+  - 通过以上命令可完成一个语种识别API的部署，默认端口号为8866。
+
+
+- ## 第二步：发送预测请求
+
+  - 配置好服务端，以下数行代码即可实现发送预测请求，获取预测结果
+
+  - ```python
+    import requests
+    import json
+
+    text = "I like panda"
+    data = {"query": text}
+    # 发送post请求，content-type类型应指定json方式，url中的ip地址需改为对应机器的ip
+    url = "http://127.0.0.1:8866/predict/baidu_language_recognition"
+    # 指定post请求的headers为application/json方式
+    headers = {"Content-Type": "application/json"}
+
+    r = requests.post(url=url, headers=headers, data=json.dumps(data))
+    print(r.json())
+    ```
+
+  - 关于PaddleHub Serving更多信息参考：[服务部署](../../../../docs/docs_ch/tutorial/serving.md)
+
+## 五、更新历史
+
+* 1.0.0
+
+  初始发布
+
+  - ```shell
+    $ hub install baidu_language_recognition==1.0.0
+    ```

modules/text/machine_translation/baidu_language_recognition/module.py

+import argparse
+import random
+from hashlib import md5
+from typing import Optional
+
+import requests
+
+import paddlehub as hub
+from paddlehub.module.module import moduleinfo
+from paddlehub.module.module import runnable
+from paddlehub.module.module import serving
+
+
+def make_md5(s, encoding='utf-8'):
+    return md5(s.encode(encoding)).hexdigest()
+
+
+@moduleinfo(name="baidu_language_recognition",
+            version="1.0.0",
+            type="text/machine_translation",
+            summary="",
+            author="baidu-nlp",
+            author_email="paddle-dev@baidu.com")
+class BaiduLanguageRecognition:
+
+    def __init__(self, appid=None, appkey=None):
+        """
+      :param appid: appid for requesting Baidu translation service.
+      :param appkey: appkey for requesting Baidu translation service.
+      """
+        # Set your own appid/appkey.
+        if appid == None:
+            self.appid = '20201015000580007'
+        else:
+            self.appid = appid
+        if appkey is None:
+            self.appkey = 'IFJB6jBORFuMmVGDRud1'
+        else:
+            self.appkey = appkey
+        self.url = 'https://fanyi-api.baidu.com/api/trans/vip/language'
+
+    def recognize(self, query: str):
+        """
+        Create image by text prompts using ErnieVilG model.
+
+        :param query: Text to be translated.
+
+        Return language type code.
+        """
+        # Generate salt and sign
+        salt = random.randint(32768, 65536)
+        sign = make_md5(self.appid + query + str(salt) + self.appkey)
+
+        # Build request
+        headers = {'Content-Type': 'application/x-www-form-urlencoded'}
+        payload = {'appid': self.appid, 'q': query, 'salt': salt, 'sign': sign}
+
+        # Send request
+        try:
+            r = requests.post(self.url, params=payload, headers=headers)
+            result = r.json()
+        except Exception as e:
+            error_msg = str(e)
+            raise RuntimeError(error_msg)
+        if result['error_code'] != 0:
+            raise RuntimeError(result['error_msg'])
+        return result['data']['src']
+
+    @runnable
+    def run_cmd(self, argvs):
+        """
+        Run as a command.
+        """
+        self.parser = argparse.ArgumentParser(description="Run the {} module.".format(self.name),
+                                              prog='hub run {}'.format(self.name),
+                                              usage='%(prog)s',
+                                              add_help=True)
+        self.arg_input_group = self.parser.add_argument_group(title="Input options", description="Input data. Required")
+        self.add_module_input_arg()
+        args = self.parser.parse_args(argvs)
+        if args.appid is not None and args.appkey is not None:
+            self.appid = args.appid
+            self.appkey = args.appkey
+        result = self.recognize(args.query)
+        return result
+
+    @serving
+    def serving_method(self, query):
+        """
+        Run as a service.
+        """
+        return self.recognize(query)
+
+    def add_module_input_arg(self):
+        """
+        Add the command input options.
+        """
+        self.arg_input_group.add_argument('--query', type=str)
+        self.arg_input_group.add_argument('--appid', type=str, default=None, help="注册得到的个人appid")
+        self.arg_input_group.add_argument('--appkey', type=str, default=None, help="注册得到的个人appkey")