fix build error

src/Microsoft.ML.Fairlearn/AutoML/AutoMLExperimentExtension.cs

@@ -9,7 +9,6 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.ML.AutoML;
 using Microsoft.ML.Data;
-using Microsoft.ML.Fairlearn.reductions;
 
 namespace Microsoft.ML.Fairlearn.AutoML
 {

src/Microsoft.ML.Fairlearn/AutoML/TunerFactory.cs

@@ -8,7 +8,6 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.ML;
 using Microsoft.ML.AutoML;
-using Microsoft.ML.Fairlearn.reductions;
 using Microsoft.ML.SearchSpace;
 
 namespace Microsoft.ML.Fairlearn.AutoML

src/Microsoft.ML.Fairlearn/Microsoft.ML.Fairlearn.csproj

@@ -4,6 +4,7 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <IncludeInPackage>Microsoft.ML.Fairlearn</IncludeInPackage>
+    <ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>None</ResolveAssemblyWarnOrErrorOnTargetArchitectureMismatch>
   </PropertyGroup>
 
   <ItemGroup>