Loading all data in shownet

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What steps will reproduce the problem?
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What is the expected output? What do you see instead?


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Please provide any additional information below.

Not exactly a bug, but if I want to see predictions with shownet (python 
shownet --show-preds=probs), the script loads all batches before showing me 
predictions from the test batch. 
If have many GBs of data for training, the script takes a lot of time before I 
can see test the case predictions.

Original issue reported on code.google.com by [e-mail] on 18 Aug 2014 at 3:42