MITIE ner模型

时间:2017-10-11 09:29:35

标签: python model named-entity-recognition rasa-nlu

我一直在探索使用预训练的MITIE模型进行命名实体提取。无论如何,我可以看看他们的实际神经模型,而不是使用预训练模型?该模型是否可用作开源?

1 个答案:

答案 0 :(得分:1)

  

设置:

     

对于初学者,您可以下载English Language Model   包含来自文件中的巨大转储的带注释文本的语料库   的 total_word_feature_extractor.dat

     

之后,从他们的下载/克隆MITIE-Master Project   官方Git。

     

如果您运行的是Windows O.S,请下载CMake

     

如果您运行的是基于x64的Windows O.S,请安装Visual Studio   2015年C ++编译器社区版。

     

下载后,将其全部提取到一个文件夹中。

The project structure will look something like this

从开始>打开VS 2015的开发人员命令提示符所有应用> Visual Studio,并导航到tools文件夹,你会看到里面的5个子文件夹。

enter image description here

下一步是使用Visual Studio Developer命令提示符中的以下Cmake命令构建ner_conll,ner_stream,train_freebase_relation_detector和wordrep包。

这样的事情:

enter image description here

对于ner_conll:

cd "C:\Users\xyz\Documents\MITIE-master\tools\ner_conll"

i)mkdir build ii)cd build iii)cmake -G "Visual Studio 14 2015 Win64" .. iv)cmake --build . --config Release --target install

对于ner_stream:

cd "C:\Users\xyz\Documents\MITIE-master\tools\ner_stream"

i)mkdir build ii)cd build iii)cmake -G "Visual Studio 14 2015 Win64" .. iv)cmake --build . --config Release --target install

对于train_freebase_relation_detector:

cd "C:\Users\xyz\Documents\MITIE-master\tools\train_freebase_relation_detector"

i)mkdir build ii)cd build iii)cmake -G "Visual Studio 14 2015 Win64" .. iv)cmake --build . --config Release --target install

对于wordrep:

cd "C:\Users\xyz\Documents\MITIE-master\tools\wordrep"

i)mkdir build ii)cd build iii)cmake -G "Visual Studio 14 2015 Win64" .. iv)cmake --build . --config Release --target install

构建它们之后,你会得到150-160个警告,不用担心。

现在,导航至"C:\Users\xyz\Documents\MITIE-master\examples\cpp\train_ner"

制作一个JSON文件" data.json"使用Visual Studio Code手动注释文本,如下所示:

{
  "AnnotatedTextList": [
    {
      "text": "I want to travel from New Delhi to Bangalore tomorrow.",
      "entities": [
        {
          "type": "FromCity",
          "startPos": 5,
          "length": 2
        },
        {
          "type": "ToCity",
          "startPos": 8,
          "length": 1
        },
        {
          "type": "TimeOfTravel",
          "startPos": 9,
          "length": 1
        }
      ]
    }
  ]
}

您可以添加更多话语并对其进行注释,训练数据越多,预测准确度越高。

这个带注释的JSON也可以通过jQuery或Angular等前端工具创建。但为了简洁起见,我手工制作了它们。

现在,要解析我们的Annotated JSON文件并将其传递给ner_training_instance的add_entity方法。

但是C ++并不支持反序来反序列化JSON,这就是为什么你可以使用这个库Rapid JSON Parser的原因。从他们的Git页面下载该包,并将其放在"C:\Users\xyz\Documents\MITIE-master\mitielib\include\mitie"

现在我们必须自定义train_ner_example.cpp文件,以便解析带注释的自定义实体JSON并将其传递给MITIE进行训练。

#include "mitie\rapidjson\document.h"
#include "mitie\ner_trainer.h"

#include <iostream>
#include <vector>
#include <list>
#include <tuple>
#include <string>
#include <map>
#include <sstream>
#include <fstream>

using namespace mitie;
using namespace dlib;
using namespace std;
using namespace rapidjson;

string ReadJSONFile(string FilePath)
{
    ifstream file(FilePath);
    string test;
    cout << "path: " << FilePath;
    try
    {
        std::stringstream buffer;
        buffer << file.rdbuf();
        test = buffer.str();
        cout << test;
        return test;
    }
    catch (exception &e)
    {
        throw std::exception(e.what());
    }
}

//Helper function to tokenize a string based on multiple delimiters such as ,.;:- or whitspace
std::vector<string> SplitStringIntoMultipleParameters(string input, string delimiter)
{
    std::stringstream stringStream(input);
    std::string line;

    std::vector<string> TokenizedStringVector;

    while (std::getline(stringStream, line))
    {
        size_t prev = 0, pos;
        while ((pos = line.find_first_of(delimiter, prev)) != string::npos)
        {
            if (pos > prev)
                TokenizedStringVector.push_back(line.substr(prev, pos - prev));
            prev = pos + 1;
        }
        if (prev < line.length())
            TokenizedStringVector.push_back(line.substr(prev, string::npos));
    }
    return TokenizedStringVector;
}

//Parse the JSON and store into appropriate C++ containers to process it.
std::map<string, list<tuple<string, int, int>>> FindUtteranceTuple(string stringifiedJSONFromFile)
{
    Document document;
    cout << "stringifiedjson : " << stringifiedJSONFromFile;
    document.Parse(stringifiedJSONFromFile.c_str());

    const Value& a = document["AnnotatedTextList"];
    assert(a.IsArray());

    std::map<string, list<tuple<string, int, int>>> annotatedUtterancesMap;

    for (int outerIndex = 0; outerIndex < a.Size(); outerIndex++)
    {
        assert(a[outerIndex].IsObject());
        assert(a[outerIndex]["entities"].IsArray());
        const Value &entitiesArray = a[outerIndex]["entities"];

        list<tuple<string, int, int>> entitiesTuple;

        for (int innerIndex = 0; innerIndex < entitiesArray.Size(); innerIndex++)
        {
            entitiesTuple.push_back(make_tuple(entitiesArray[innerIndex]["type"].GetString(), entitiesArray[innerIndex]["startPos"].GetInt(), entitiesArray[innerIndex]["length"].GetInt()));
        }

        annotatedUtterancesMap.insert(pair<string, list<tuple<string, int, int>>>(a[outerIndex]["text"].GetString(), entitiesTuple));
    }

    return annotatedUtterancesMap;
}

int main(int argc, char **argv)
{

    try {

        if (argc != 3)
        {
            cout << "You must give the path to the MITIE English total_word_feature_extractor.dat file." << endl;
            cout << "So run this program with a command like: " << endl;
            cout << "./train_ner_example ../../../MITIE-models/english/total_word_feature_extractor.dat" << endl;
            return 1;
        }

        else
        {
            string filePath = argv[2];
            string stringifiedJSONFromFile = ReadJSONFile(filePath);

            map<string, list<tuple<string, int, int>>> annotatedUtterancesMap = FindUtteranceTuple(stringifiedJSONFromFile);


            std::vector<string> tokenizedUtterances;
            ner_trainer trainer(argv[1]);

            for each (auto item in annotatedUtterancesMap)
            {
                tokenizedUtterances = SplitStringIntoMultipleParameters(item.first, " ");
                mitie::ner_training_instance *currentInstance = new mitie::ner_training_instance(tokenizedUtterances);
                for each (auto entity in item.second)
                {
                    currentInstance -> add_entity(get<1>(entity), get<2>(entity), get<0>(entity).c_str());
                }
                // trainingInstancesList.push_back(currentInstance);
                trainer.add(*currentInstance);
                delete currentInstance;
            }


            trainer.set_num_threads(4);

            named_entity_extractor ner = trainer.train();

            serialize("new_ner_model.dat") << "mitie::named_entity_extractor" << ner;

            const std::vector<std::string> tagstr = ner.get_tag_name_strings();
            cout << "The tagger supports " << tagstr.size() << " tags:" << endl;
            for (unsigned int i = 0; i < tagstr.size(); ++i)
                cout << "\t" << tagstr[i] << endl;
            return 0;
        }
    }

    catch (exception &e)
    {
        cerr << "Failed because: " << e.what();
    }
}

add_entity接受3个参数,可以是向量的标记化字符串,自定义实体类型名称,句子中单词的起始索引以及单词的范围。

现在我们必须使用Developer Command Prompt Visual Studio中的以下命令构建ner_train_example.cpp。

1)cd "C:\Users\xyz\Documents\MITIE-master\examples\cpp\train_ner" 2)mkdir build 3)cd build 4)cmake -G "Visual Studio 14 2015 Win64" .. 5)cmake --build . --config Release --target install 6)cd Release

7)train_ner_example "C:\\Users\\xyz\\Documents\\MITIE-master\\MITIE-models\\english\\total_word_feature_extractor.dat" "C:\\Users\\xyz\\Documents\\MITIE-master\\examples\\cpp\\train_ner\\data.json"

成功执行上述操作后,我们将获得一个new_ner_model.dat文件,该文件是我们话语的序列化和训练版本。

现在,该.dat文件可以传递给RASA或单独使用。

将其传递给RASA:

按如下方式创建config.json文件:

{
    "project": "demo",
    "path": "C:\\Users\\xyz\\Desktop\\RASA\\models",
    "response_log": "C:\\Users\\xyz\\Desktop\\RASA\\logs",
    "pipeline": ["nlp_mitie", "tokenizer_mitie", "ner_mitie", "ner_synonyms", "intent_entity_featurizer_regex", "intent_classifier_mitie"], 
    "data": "C:\\Users\\xyz\\Desktop\\RASA\\data\\examples\\rasa.json",
    "mitie_file" : "C:\\Users\\xyz\\Documents\\MITIE-master\\examples\\cpp\\train_ner\\Release\\new_ner_model.dat",
    "fixed_model_name": "demo",
    "cors_origins": ["*"],
    "aws_endpoint_url": null,
    "token": null,
    "num_threads": 2,
    "port": 5000
}