public string LearnSingle(List <TextExtractExample> textExtractExamples)
{
var session = new RegionSession();
var regionExamples = new List <RegionExample>();
foreach (var textExtractExample in textExtractExamples)
{
var inputRegion = RegionSession.CreateStringRegion(textExtractExample.text);
var textExtractSelection = textExtractExample.selections.First(); // at most only one example is added per string region
if (textExtractSelection != null)
{
var exampleRegion = inputRegion.Slice((uint)textExtractSelection.startPos, (uint)textExtractSelection.endPos);
var regionExample = new RegionExample(inputRegion, exampleRegion);
regionExamples.Add(regionExample);
}
}
session.AddConstraints(regionExamples);
var program = session.Learn();
return(program.Serialize());
}
/// <summary>
/// Learns a program to extract a multiple regions using two examples in two different files.
/// Learning multiple regions is similar to learning single regions, it's just doing same task again for different regions.
/// </summary>
private static void LearnMultipleRegionsUsingMultipleFiles(List <string> paths, List <Dictionary <string, string> > regionsToLearn)
{
List <StringRegion> inputs = new List <StringRegion>();
for (int i = 0; i < paths.Count; i++)
{
string s = File.ReadAllText(paths[i]);
inputs.Add(RegionSession.CreateStringRegion(s));
}
int trainingDocumentCount = 2;
List <string> fieldsToLearn = regionsToLearn[0].Keys.ToList();
Dictionary <string, RegionSession> sessionPerField = new Dictionary <string, RegionSession>();
foreach (string field in fieldsToLearn)
{
RegionSession session = new RegionSession();
for (int i = 0; i < trainingDocumentCount; i++)
{
string output = regionsToLearn[i][field];
uint start = inputs[i].IndexOfRelative(output).Value;
uint end = (uint)(start + output.Length);
RegionExample example = new RegionExample(inputs[i], inputs[i].Slice(start, end));
session.AddConstraints(example);
}
sessionPerField.Add(field, session);
}
Dictionary <string, RegionProgram> programPerField = new Dictionary <string, RegionProgram>();
foreach (var fieldSessionPair in sessionPerField)
{
RegionProgram program = fieldSessionPair.Value.Learn();
if (program == null)
{
Console.Error.WriteLine("Error: Learning fails for Field : " + fieldSessionPair.Key);
}
else
{
programPerField.Add(fieldSessionPair.Key, program);
}
}
//testing
StreamWriter outputWriter = new StreamWriter(@"..\..\output.txt");
outputWriter.WriteLine(string.Join("\t|\t", programPerField.Keys));
for (int i = trainingDocumentCount; i < inputs.Count; i++)
{
List <string> values = new List <string>();
foreach (var fieldProgramPair in programPerField)
{
string value = fieldProgramPair.Value.Run(inputs[i])?.Value;
values.Add(value);
}
outputWriter.WriteLine(string.Join("\t|\t\t", values));
}
outputWriter.Flush();
outputWriter.Close();
}