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Fixes #629
When uncommenting the titanic validator test (which was previously commented because the loss was NaN), I increased the accuracy minimum without noticing that the accuracy was tested at initialization, i.e., without any training.
Therefore, I lower the validator accuracy expectations (from 0.5 to 0.3) but I add assertions on minimum training and validation accuracy (both > 0.6) in the end-to-end test.