/// <summary>
/// Learns a program to extract a sequence of regions from a file.
/// </summary>
private static void LearnSequenceReferencingSibling()
{
var input =
SequenceLearner.CreateStringRegion(
"United States\nCarrie Dodson 100\nLeonard Robledo 75\nMargaret Cook 320\n" +
"Canada\nConcetta Beck 350\nNicholas Sayers 90\nFrancis Terrill 2430\n" +
"Great Britain\nNettie Pope 50\nMack Beeson 1070");
StringRegion[] areas = { input.Slice(0, 13), input.Slice(69, 75), input.Slice(134, 147) };
// Suppose we want to extract all last names from the input string.
var examples = new[] {
new MemberPrefix <StringRegion, StringRegion>(input, new[] {
input.Slice(14, 20), // input => "Carrie"
input.Slice(32, 39), // input => "Leonard"
})
};
SequenceProgram topRankedProg = SequenceLearner.Instance.Learn(examples);
if (topRankedProg == null)
{
Console.Error.WriteLine("Error: Learning fails!");
return;
}
foreach (var a in areas
.SelectMany(area => topRankedProg.Run(area)
.Select(output => new { Input = area, Output = output })))
{
var output = a.Output != null ? a.Output.Value : "null";
Console.WriteLine("\"{0}\" => \"{1}\"", a.Input, output);
}
}
/// <summary>
/// Learns a program to extract a sequence of regions using its preceding sibling as reference.
/// </summary>
private static void LearnSequence()
{
// It is advised to learn a sequence with at least 2 examples because generalizing a sequence from a single element is hard.
// Also, we need to give positive examples continuously (i.e., we cannot skip any example).
var input =
SequenceLearner.CreateStringRegion(
"United States\nCarrie Dodson 100\nLeonard Robledo 75\nMargaret Cook 320\n" +
"Canada\nConcetta Beck 350\nNicholas Sayers 90\nFrancis Terrill 2430\n" +
"Great Britain\nNettie Pope 50\nMack Beeson 1070");
// Suppose we want to extract all last names from the input string.
var examples = new[] {
new MemberPrefix <StringRegion, StringRegion>(input, new[] {
input.Slice(14, 20), // input => "Carrie"
input.Slice(32, 39), // input => "Leonard"
})
};
SequenceProgram topRankedProg = SequenceLearner.Instance.Learn(examples);
if (topRankedProg == null)
{
Console.Error.WriteLine("Error: Learning fails!");
return;
}
foreach (var r in topRankedProg.Run(input))
{
var output = r != null ? r.Value : "null";
Console.WriteLine(output);
}
}