Add save functionality for WA; small bug in NPTC

Author: Enkidu93

src/SIL.Machine.Translation.Thot/ThotWordAlignmentModel.cs

@@ -4,6 +4,7 @@
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
+using System.Threading;
 using System.Threading.Tasks;
 using SIL.Extensions;
 using SIL.Machine.Corpora;
@@ -141,7 +142,7 @@ public ITrainer CreateTrainer(IParallelTextCorpus corpus, ITokenizer<string, int
             return trainer;
         }
 
-        public Task SaveAsync()
+        public Task SaveAsync(CancellationToken cancellationToken = default)
         {
             CheckDisposed();
 

src/SIL.Machine/Corpora/NParallelTextCorpus.cs

@@ -217,6 +217,8 @@ NParallelTextRow row in CreateMinRefRows(
 
                         for (int i = 0; i < rangeInfo.Rows.Count; i++)
                         {
+                            if (completed[i])
+                                continue;
                             rangeInfo.AddTextRow(currentRows[i], i);
                             sameRefRows[i].Clear();
                         }

src/SIL.Machine/Translation/IWordAlignmentModel.cs

@@ -1,9 +1,13 @@
-using SIL.Machine.Corpora;
+using System.Threading;
+using System.Threading.Tasks;
+using SIL.Machine.Corpora;
 
 namespace SIL.Machine.Translation
 {
     public interface IWordAlignmentModel : IWordAlignmentEngine
     {
         ITrainer CreateTrainer(IParallelTextCorpus corpus);
+        Task SaveAsync(CancellationToken cancellationToken = default);
+        void Save();
     }
 }

src/SIL.Machine/Translation/SymmetrizedWordAlignmentModel.cs

@@ -1,4 +1,6 @@
-using SIL.Machine.Corpora;
+using System.Threading;
+using System.Threading.Tasks;
+using SIL.Machine.Corpora;
 
 namespace SIL.Machine.Translation
 {
@@ -27,6 +29,20 @@ public ITrainer CreateTrainer(IParallelTextCorpus corpus)
             return new SymmetrizedWordAlignmentModelTrainer(directTrainer, inverseTrainer);
         }
 
+        public void Save()
+        {
+            CheckDisposed();
+            _directWordAlignmentModel.Save();
+            _inverseWordAlignmentModel.Save();
+        }
+
+        public async Task SaveAsync(CancellationToken cancellationToken = default)
+        {
+            CheckDisposed();
+            await _directWordAlignmentModel.SaveAsync(cancellationToken);
+            await _inverseWordAlignmentModel.SaveAsync(cancellationToken);
+        }
+
         protected override void DisposeManagedResources()
         {
             _directWordAlignmentModel.Dispose();