More examples: INVALID_ARGUMENT: In[1] is not a matrix. Instead it has shape [2]

[jvanecek]

(Case reproduced in this commit

I imported the rest of the PolyMathOrg examples , and adapted all the tests in TensorFlowExamplesTest them for VAST but 6 of them are failing with this same error:

INVALID_ARGUMENT: In[1] is not a matrix. Instead it has shape [2]
[[{{node MatMul_4}}]]

Probably there is an error in the code I adapted while writing it for VAST but can't find the error