Port changes from sillsdev/machine.py#279

Author: Enkidu93

src/SIL.Machine/Translation/HybridTranslationEngine.cs

@@ -488,6 +488,7 @@ private TranslationResult Merge(TranslationResult interactiveResult, Translation
                 interactiveResult.SourceTokens,
                 mergedTargetSegment,
                 mergedConfidences,
+                -1.0,
                 mergedSources,
                 alignment,
                 interactiveResult.Phrases

src/SIL.Machine/Translation/TransferEngine.cs

@@ -186,6 +186,7 @@ public IReadOnlyList<TranslationResult> Translate(int n, IReadOnlyList<string> s
                         segment,
                         targetTokens,
                         confidences,
+                        -1.0,
                         sources,
                         alignment,
                         new[] { new Phrase(Range<int>.Create(0, normalizedSourceTokens.Count), targetWords.Count) }

src/SIL.Machine/Translation/TranslationExtensions.cs

@@ -120,6 +120,7 @@ public static TranslationResult Truecase(
                 result.SourceTokens,
                 targetTokens,
                 result.Confidences,
+                result.SequenceConfidence,
                 result.Sources,
                 result.Alignment,
                 result.Phrases

src/SIL.Machine/Translation/TranslationResult.cs

@@ -11,6 +11,7 @@ public TranslationResult(
             IEnumerable<string> sourceTokens,
             IEnumerable<string> targetTokens,
             IEnumerable<double> confidences,
+            double sequenceConfidence,
             IEnumerable<TranslationSources> sources,
             WordAlignmentMatrix alignment,
             IEnumerable<Phrase> phrases
@@ -27,6 +28,7 @@ IEnumerable<Phrase> phrases
                     nameof(confidences)
                 );
             }
+            SequenceConfidence = sequenceConfidence;
             Sources = sources.ToArray();
             if (Sources.Count != TargetTokens.Count)
             {
@@ -58,6 +60,7 @@ IEnumerable<Phrase> phrases
         public IReadOnlyList<string> SourceTokens { get; }
         public IReadOnlyList<string> TargetTokens { get; }
         public IReadOnlyList<double> Confidences { get; }
+        public double SequenceConfidence { get; }
         public IReadOnlyList<TranslationSources> Sources { get; }
         public WordAlignmentMatrix Alignment { get; }
         public IReadOnlyList<Phrase> Phrases { get; }

src/SIL.Machine/Translation/TranslationResultBuilder.cs

@@ -11,6 +11,7 @@ public class TranslationResultBuilder
         private readonly List<double> _confidences;
         private readonly List<TranslationSources> _sources;
         private readonly List<PhraseInfo> _phrases;
+        private readonly double _sequenceConfidences;
 
         public TranslationResultBuilder(IReadOnlyList<string> sourceTokens)
         {
@@ -19,6 +20,7 @@ public TranslationResultBuilder(IReadOnlyList<string> sourceTokens)
             _confidences = new List<double>();
             _sources = new List<TranslationSources>();
             _phrases = new List<PhraseInfo>();
+            _sequenceConfidences = -1.0;
         }
 
         public IReadOnlyList<string> SourceTokens { get; }
@@ -29,6 +31,7 @@ public TranslationResultBuilder(IReadOnlyList<string> sourceTokens)
         public IReadOnlyList<double> Confidences => _confidences;
         public IReadOnlyList<TranslationSources> Sources => _sources;
         public IReadOnlyList<PhraseInfo> Phrases => _phrases;
+        public double SequenceConfidences => _sequenceConfidences;
 
         public void AppendToken(string token, TranslationSources source, double confidence)
         {
@@ -246,6 +249,7 @@ public TranslationResult ToResult(string translation = null)
                 SourceTokens,
                 _targetTokens,
                 _confidences,
+                _sequenceConfidences,
                 sources,
                 alignment,
                 phrases