Tensorflow documentation issues

[Ivanidzo4ka]

https://github.com/dotnet/machinelearning/blob/master/src/Microsoft.ML.TensorFlow/doc.xml

A) Look in example: var pipeline = new LearningPipeline(seed: 1); LearningPiepline actually don't have seed parameter

B) OutputColumns = "Output" OutputColumns is actually array, so you can't pass just string to it.

C) This transform requires the <a href="https://dotnet.myget.org/feed/dotnet-core/package/nuget/Microsoft.ML.TensorFlow/0.5.0-preview-26830-5">Microsoft.ML.TensorFlow</a> nuget to be installed.
I'm not sure we should include links to preview nuget package

D) The transform currently accepts the <a href="https://www.tensorflow.org/mobile/prepare_models">frozen TensorFlow model</a> file as input.
I think we support frozen and non frozen models.

[markusweimer]

Good catch! Is there a way to automatically test these code examples such that we cannot make that mistake again?

[abgoswam]

Issue #637 would enable the capability of automatically testing the code examples in our documentation