Minor changes and refactoring

Author: Sergio0694

NeuralNetwork.NET/Extensions/MiscExtensions.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using System.Text;
 using System.Threading.Tasks;
 using JetBrains.Annotations;
 
@@ -20,8 +21,10 @@ public static class MiscExtensions
         /// <param name="item">The item to cast</param>
         [Pure, NotNull]
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static TOut To<TIn, TOut>([NotNull] this TIn item) where TOut : class, TIn => item as TOut 
-            ?? throw new InvalidOperationException($"The item of type {typeof(TIn)} is a {item.GetType()} instance and can't be cast to {typeof(TOut)}");
+        public static TOut To<TIn, TOut>([NotNull] this TIn item)
+            where TIn : class
+            where TOut : TIn
+            => (TOut)item;
 
         /// <summary>
         /// Returns the maximum value between two numbers
@@ -138,5 +141,20 @@ public static void AssertCompleted(in this ParallelLoopResult result)
         {
             if (!result.IsCompleted) throw new InvalidOperationException("Error while performing the parallel loop");
         }
+
+        /// <summary>
+        /// Removes the left spaces from the input verbatim string
+        /// </summary>
+        /// <param name="text">The string to trim</param>
+        [Pure, NotNull]
+        public static String TrimVerbatim([NotNull] this String text)
+        {
+            String[] lines = text.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
+            return lines.Aggregate(new StringBuilder(), (b, s) =>
+            {
+                b.AppendLine(s.Trim());
+                return b;
+            }).ToString();
+        }
     }
 }

NeuralNetwork.NET/Helpers/TensorMap.cs

@@ -5,6 +5,7 @@
 using JetBrains.Annotations;
 using NeuralNetworkNET.APIs.Enums;
 using NeuralNetworkNET.APIs.Results;
+using NeuralNetworkNET.Extensions;
 
 namespace NeuralNetworkNET.Helpers
 {
@@ -20,7 +21,7 @@ public static class TrainingProgressExportHelpers
                                                       plt.ylabel(""$YLABEL$"")
                                                       plt.xlabel(""Epoch"")
                                                       plt.plot(x)
-                                                      plt.show()".Split(new[] { Environment.NewLine }, StringSplitOptions.None).Aggregate(String.Empty, (s, l) => $"{s}{l.Trim()}{Environment.NewLine}");
+                                                      plt.show()".TrimVerbatim();
 
         // The custom 4-spaces indentation for the data points (the \t character is not consistent across different editors)
         private const String Tab = "    ";

NeuralNetwork.NET/Helpers/TrainingProgressExportHelpers.cs

@@ -52,5 +52,26 @@ public void ThresholdAccuracyTest()
             Assert.IsFalse(tester(yHat, y1));
             Assert.IsTrue(tester(yHat, y2));
         }
+
+        [TestMethod]
+        public void TrimVerbatim()
+        {
+            const String text = @"import matplotlib.pyplot as plt
+                            x = [$VALUES$]
+                            plt.grid(linestyle=""dashed"")
+                            plt.ylabel(""$YLABEL$"")
+                            plt.xlabel(""Epoch"")
+                            plt.plot(x)
+                            plt.show()";
+            const String expected = @"import matplotlib.pyplot as plt
+x = [$VALUES$]
+plt.grid(linestyle=""dashed"")
+plt.ylabel(""$YLABEL$"")
+plt.xlabel(""Epoch"")
+plt.plot(x)
+plt.show()
+";
+            Assert.IsTrue(text.TrimVerbatim().Equals(expected));
+        }
     }
 }