ComponentCatalog logging errors

[justinormont]

System information

• OS version/distro: OSX 10.12
• .NET Version (eg., dotnet --info): .NET Core SDK 2.1.401

Issue

When running a simple showSchema command, dotnet ./bin/AnyCPU.Release/Microsoft.ML.Console/netcoreapp2.0/MML.dll showSchema data=test/data/breast-cancer.txt, as taken from #593 (comment), many errors are displayed.

Output:

CacheClassesFromAssembly: can't map name ModuleGenerator to ModuleGenerator, already mapped to ModuleGenerator
CacheClassesFromAssembly: can't map name Module to ModuleGenerator, already mapped to ModuleGenerator
CacheClassesFromAssembly: can't map name CrossValidationBinaryMacro to Void, already mapped to Void
CacheClassesFromAssembly: can't map name CrossValidationMacro to Void, already mapped to Void
CacheClassesFromAssembly: can't map name CVSplit to Void, already mapped to Void
CacheClassesFromAssembly: can't map name DataViewReference to Void, already mapped to Void
CacheClassesFromAssembly: can't map name FeatureCombiner to Void, already mapped to Void
CacheClassesFromAssembly: can't map name ImportTextData to Void, already mapped to Void
CacheClassesFromAssembly: can't map name ExecGraph to ExecuteGraphCommand, already mapped to ExecuteGraphCommand
CacheClassesFromAssembly: can't map name ModelOperations to Void, already mapped to Void
CacheClassesFromAssembly: can't map name OneVersusAllMacro to Void, already mapped to Void
CacheClassesFromAssembly: can't map name TrainTestBinaryMacro to Void, already mapped to Void
CacheClassesFromAssembly: can't map name TrainTestMacro to Void, already mapped to Void
CacheClassesFromAssembly: can't map name TrainTestSplit to Void, already mapped to Void
CacheClassesFromAssembly: can't map name CSGenerator to CSharpApiGenerator, already mapped to CSharpApiGenerator
CacheClassesFromAssembly: can't map name CS to CSharpApiGenerator, already mapped to CSharpApiGenerator
2 columns:
  Label: R4
  Features: Vec<R4, 9>

This error is logged within the ComponentCatalog:

machinelearning/src/Microsoft.ML.Core/ComponentModel/ComponentCatalog.cs

Lines 491 to 493 in 6812cb5

	Console.Error.WriteLine(
	"CacheClassesFromAssembly: can't map name {0} to {1}, already mapped to {2}",
	name, info.Type.Name, infoCur.Type.Name);

[eerhardt]

Justin, can you try deleting your bin directory and rebuilding from the root again? We renamed Microsoft.ML to Microsoft.ML.Legacy recently. And I believe you have both assemblies in your bin directory causing the duplicate type error.
I saw a similar issue myself locally.

[justinormont]

@eerhardt: Exactly correct.

After running ./build.sh -CleanAllProjects and ./build.sh -Release, the errors are gone:

$ dotnet ./bin/AnyCPU.Release/Microsoft.ML.Console/netcoreapp2.0/MML.dll showSchema data=test/data/breast-cancer.txt
2 columns:
  Label: R4
  Features: Vec<R4, 9>