Visual Studio Refused to Remove Microsoft Machine Learning Package from Project - visual-studio

Question

I installed Microsoft.ML for experimental purposes. One of the problems is that this requires the target to be set to either x64 or x84 platform, not "Any CPU". As a result, I decided to uninstall it.
However, I've done this through Visual Studio Installer and also through package manager. I'm sure that Microsoft.ML does not appear when looking from either of them (either as icons or menu items). I also deleted the files and small projects I added when going through the Microsoft.ML tutorials.
Yet, the compiler still complained that Microsoft.ML only supports x64 or x84 platforms, and demanded me to switch to one of them. This told me that somehow Microsoft.ML was still in my project.
When I looked at my project file (*.csproj), I found several lines related to .ML. I don't know how I can remove them through Visual Studio. Eventually, I had to remove them manually from the project file, then everything worked.
Can anyone tell me what I was missing?
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.props" Condition="Exists('..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.props')" />
<Import Project="..\packages\Microsoft.ML.CpuMath.2.0.0\build\netstandard2.0\Microsoft.ML.CpuMath.props" Condition="Exists('..\packages\Microsoft.ML.CpuMath.2.0.0\build\netstandard2.0\Microsoft.ML.CpuMath.props')" />
...
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
<PropertyGroup>
<ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them. For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
</PropertyGroup>
<Error Condition="!Exists('..\packages\Microsoft.ML.CpuMath.2.0.0\build\netstandard2.0\Microsoft.ML.CpuMath.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.ML.CpuMath.2.0.0\build\netstandard2.0\Microsoft.ML.CpuMath.props'))" />
<Error Condition="!Exists('..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.props'))" />
<Error Condition="!Exists('..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.ML.2.0.0\build\netstandard2.0\Microsoft.ML.targets'))" />
</Target>
...
</Project>