Error Executing Graph with ImageLoader

[zyw400]

System information

• OS version/distro: windows
• .NET Version (eg., dotnet --info): latest master branch

Issue

When executing a graph generated with ImageLoader, bombed with an error:

[8/30/2018 5:06:37 PM Error] [xUnit.net 00:00:12.4271461] Microsoft.ML.Runtime.RunTests.TestEntryPoints.EntryPointExecGraphCommand [FAIL]
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4294784] System.FormatException : One of the identified items was in an invalid format.
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4311870] Stack Trace:
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4325847] D:\mldotnet0823\machinelearning\src\Microsoft.ML.Core\Utilities\Contracts.cs(706,0): at Microsoft.ML.Runtime.Contracts.CheckDecode(IExceptionContext ctx, Boolean f)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4330332] D:\mldotnet0823\machinelearning\src\Microsoft.ML.Data\Model\ModelLoadContext.cs(153,0): at Microsoft.ML.Runtime.Model.ModelLoadContext.LoadNonEmptyString()
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4331477] D:\mldotnet0823\machinelearning\src\Microsoft.ML.Data\Transforms\TransformBase.cs(354,0): at Microsoft.ML.Runtime.Data.OneToOneTransformBase.Bindings.Create(OneToOneTransformBase parent, ModelLoadContext ctx, ISchema input, ITransposeSchema transInput, Func2 testType) [8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4332460] D:\mldotnet0823\machinelearning\src\Microsoft.ML.Data\Transforms\TransformBase.cs(508,0): at Microsoft.ML.Runtime.Data.OneToOneTransformBase..ctor(IHost host, ModelLoadContext ctx, IDataView input, Func2 testType)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4333372] D:\mldotnet0823\machinelearning\src\Microsoft.ML.ImageAnalytics\ImageLoaderTransform.cs(92,0): at Microsoft.ML.Runtime.ImageAnalytics.ImageLoaderTransform..ctor(IHost host, ModelLoadContext ctx, IDataView input)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4334287] D:\mldotnet0823\machinelearning\src\Microsoft.ML.ImageAnalytics\ImageLoaderTransform.cs(110,0): at Microsoft.ML.Runtime.ImageAnalytics.ImageLoaderTransform.<>c__DisplayClass11_0.b__0(IChannel ch)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4335158] D:\mldotnet0823\machinelearning\src\Microsoft.ML.Core\Data\IHostEnvironment.cs(232,0): at Microsoft.ML.Runtime.HostExtensions.Apply[T](IHost host, String channelName, Func`2 func)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4336053] D:\mldotnet0823\machinelearning\src\Microsoft.ML.ImageAnalytics\ImageLoaderTransform.cs(110,0): at Microsoft.ML.Runtime.ImageAnalytics.ImageLoaderTransform.Create(IHostEnvironment env, ModelLoadContext ctx, IDataView input)
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4349911] Output:
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4350922] Test EntryPointExecGraphCommand: aborted: passed
[8/30/2018 5:06:37 PM Informational] [xUnit.net 00:00:12.4543727] Finished: Microsoft.ML.Core.Tests

Source code / logs

Please use any random images for testing and modify the test.txt to test.csv.

test.txt
image_graph.txt

[montebhoover]

Confirmed that this does not repro as of commit 2c0bb21. I believe this was fixed as a side effect of #753 (Image transforms become Estimators).