add string normalize method

RELEASENOTES.md

@@ -8,6 +8,7 @@ __Bug Fixes__:
 #1426 Sequential.eval() does not put model into eval mode<br/>
 `torch.optim.lr_scheduler.LinearLR` `end_factor` default has been corrected, is now 1.0.<br/>
 Update package version of SixLabors.ImageSharp to avoid security vulnerability<br/>
+Updated dll dependencies loading to avoid using hardcoded version strings<br/>
 
 __API Changes__:
 

src/TorchSharp/Torch.cs

@@ -54,6 +54,26 @@ public static partial class torch
         static bool nativeBackendCudaLoaded = false;
 
         public static string __version__ => libtorchPackageVersion;
+        public static string NormalizeNuGetVersion(string versionString)
+        {
+            if (string.IsNullOrWhiteSpace(versionString))
+                throw new ArgumentException($"Invalid NuGet version: {versionString}. Version string is null, empty or only contains whitespaces");
+
+            string[] parts = versionString.Split('-', '+');
+            string[] versionParts = parts[0].Split('.');
+
+            if (versionParts.Length < 2 || versionParts.Length > 4 || !versionParts.All(v => int.TryParse(v, out _)))
+                throw new ArgumentException($"Invalid NuGet version: {versionString}. Please check: https://learn.microsoft.com/en-us/nuget/concepts/package-versioning");
+
+            string normalizedVersion = versionParts[0] + "." + versionParts[1];
+            if (versionParts.Length > 2) normalizedVersion += "." + versionParts[2];
+            if (versionParts.Length > 3 && int.Parse(versionParts[3]) != 0) normalizedVersion += "." + versionParts[3];
+
+            if (parts.Length > 1)
+                normalizedVersion += "-" + parts[1];
+
+            return normalizedVersion;
+        }
 
         internal static bool TryLoadNativeLibraryFromFile(string path, StringBuilder trace) {
             bool ok;
@@ -168,14 +188,14 @@ private static void LoadNativeBackend(bool useCudaBackend, out StringBuilder? tr
 
                     if (torchsharpLoc!.Contains("torchsharp") && torchsharpLoc.Contains("lib") && Directory.Exists(packagesDir) && Directory.Exists(torchsharpHome)) {
 
-                        var torchSharpVersion = Path.GetFileName(torchsharpHome); // really GetDirectoryName
-
+                        var torchSharpVersion = NormalizeNuGetVersion(Path.GetFileName(torchsharpHome));
+                        var normalizedLibtorchPackageVersion = NormalizeNuGetVersion(libtorchPackageVersion);
                         if (useCudaBackend) {
                             var consolidatedDir = Path.Combine(torchsharpLoc, $"cuda-{cudaVersion}");
 
                             trace.AppendLine($"    Trying dynamic load for .NET/F# Interactive by consolidating native {cudaRootPackage}-* binaries to {consolidatedDir}...");
 
-                            var cudaOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, $"{cudaRootPackage}-*", libtorchPackageVersion, consolidatedDir, trace);
+                            var cudaOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, $"{cudaRootPackage}-*", normalizedLibtorchPackageVersion, consolidatedDir, trace);
                             if (cudaOk) {
                                 cudaOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, "torchsharp", torchSharpVersion, consolidatedDir, trace);
                                 if (cudaOk) {
@@ -193,7 +213,7 @@ private static void LoadNativeBackend(bool useCudaBackend, out StringBuilder? tr
 
                             trace.AppendLine($"    Trying dynamic load for .NET/F# Interactive by consolidating native {cpuRootPackage}-* binaries to {consolidatedDir}...");
 
-                            var cpuOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, cpuRootPackage, libtorchPackageVersion, consolidatedDir, trace);
+                            var cpuOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, cpuRootPackage, normalizedLibtorchPackageVersion, consolidatedDir, trace);
                             if (cpuOk) {
                                 cpuOk = CopyNativeComponentsIntoSingleDirectory(packagesDir, "torchsharp", torchSharpVersion, consolidatedDir, trace);
                                 if (cpuOk) {

test/TorchSharpTest/TestTorchSharp.cs

@@ -4,6 +4,8 @@
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Reflection;
+using System.Security.Cryptography;
+using Tensorboard;
 using Xunit;
 
 using static TorchSharp.torch;
@@ -450,6 +452,17 @@ public void AllowFP16ReductionCuBLAS()
             Assert.False(torch.backends.cuda.matmul.allow_fp16_reduced_precision_reduction);
         }
 
+        [Fact]
+        public void CheckVersionStrings()
+        {
+            Assert.Equal("2.5.1", torch.NormalizeNuGetVersion("2.5.1.0"));
+            Assert.Equal("0.105.0", torch.NormalizeNuGetVersion("0.105.0.0"));
+            Assert.Equal("0.1.0-alpha", torch.NormalizeNuGetVersion("0.1.0-alpha"));
+            Assert.Equal("0.1.0", torch.NormalizeNuGetVersion("0.1.0"));
+            Assert.Throws<ArgumentException>(() => NormalizeNuGetVersion(""));
+            Assert.Throws<ArgumentException>(() => NormalizeNuGetVersion("1.2.3.4.5"));
+        }
+
         // Because some of the tests mess with global state, and are run in parallel, we need to
         // acquire a lock before testing setting the default RNG see.
         private static object _lock = new object();