Esempio n. 1
0
        /// <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);
            }
        }
Esempio n. 2
0
        /// <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);
            }
        }