Styjun

I am developing an application where I am sending new rules to the RegexNER file via a REST HTTP PATCH endpoint.

[Route("RegexNER")]
[HttpPatch]
public IHttpActionResult UpdateRegexNERFile([FromBody] List<RegexNERUpdateDTO> UpdateEntries)

 if (UpdateEntries == null)
 return Content(HttpStatusCode.BadRequest, new message = "Cannot update Regex NER for invalid requests!" );

 string regexNERFilePath = Path.Combine(HttpContext.Current.Server.MapPath("~"), "Models", "regexner_custom.txt");
 string regexFileContents = File.ReadAllText(regexNERFilePath);

 List<string> newEntryList = new List<string>();

 foreach (RegexNERUpdateDTO entry in UpdateEntries)
 
 foreach (string entityEntry in entry.Entries)
 
 string newEntry = $"entityEntrytentry.Entity";

 if (regexFileContents.IndexOf(newEntry, StringComparison.OrdinalIgnoreCase) == -1)
 newEntryList.Add(newEntry);
 
 

 // Remove read only file access
 FileInfo myFile = new FileInfo(regexNERFilePath)
 
 IsReadOnly = false
 ;

 File.AppendAllText(regexNERFilePath, Environment.NewLine + string.Join(Environment.NewLine, newEntryList));
 NLPInitializer.InitializeCoreNLP();
 return Ok();

This is the code for initializing the CoreNLP pipeline:

public static class NLPInitializer

 public static StanfordCoreNLP Pipeline get; set; 

 /// <summary>
 /// This method is called only once (at startup) to initialize the StanfordCoreNLP pipeline object
 /// </summary>
 public static void InitializeCoreNLP()
 
 // Path to the folder with models extracted from `stanford-corenlp-3.8.0-models.jar`
 string jarRoot = ConfigurationManager.AppSettings["CoreNLPModelPath"];
 string modelsDirectory = Path.Combine(jarRoot, "edu", "stanford", "nlp", "models");

 // SUTime configuration
 string sutimeRules = Path.Combine(modelsDirectory, "sutime", "defs.sutime.txt") + "," +
 // Path.Combine(modelsDirectory, "sutime", "english.holidays.sutime.txt") + "," +
 Path.Combine(modelsDirectory, "sutime", "english.sutime.txt");
 try
 
 Properties props = new Properties();
 //props.setProperty("ner.model", Path.Combine(modelsDirectory + "ner", "english.muc.7class.distsim.crf.ser.gz"));
 string regexNerFilePath = Path.Combine(HttpContext.Current.Server.MapPath("~"), "Models", "regexner_custom.txt");
 props.setProperty("regexner.mapping", regexNerFilePath);
 props.setProperty("regexner.ignorecase", "true");
 props.setProperty("coref.algorithm", "neural");
 //props.setProperty("annotators", "tokenize,ssplit,pos,lemma,ner,parse,depparse,mention,coref,sentiment,regexner,relation,natlog,openie");
 props.setProperty("annotators", "tokenize,ssplit,pos,lemma,ner,parse,depparse,coref,sentiment,regexner,relation,natlog,openie");
 //props.setProperty("ner.useSUTime", "0");
 props.setProperty("sutime.rules", sutimeRules);
 props.setProperty("sutime.binders", "0");
 props.setProperty("openie.resolve_coref", "false");

 string curDir = Environment.CurrentDirectory;
 Directory.SetCurrentDirectory(jarRoot);
 Pipeline = new StanfordCoreNLP(props);
 Pipeline.addAnnotator(new TimeAnnotator("sutime", props));
 Directory.SetCurrentDirectory(curDir);
 
 catch (Exception ex)
 
 throw;
 
 

But the problem is in this line
NLPInitializer.InitializeCoreNLP();

I want to re-initialize the Stanford CoreNLP pipeline such that picks up the latest changes made to the RegexNER file and finds the entity based on the updated rules.

But its the pipeline is not re-initializing, I don't know why.

One thing to be noticed is when I restart IIS or restart the app from inetmgr then CoreNLP picks up the latest changes made to the RegexNER file.

But restarting the IIS server is not feasible for every HTTP PATCH request, is there any alternative to this problem.

I am using CoreNLP v3.9.1 english model and CoreNLP 3.9.1 C# Nuget.