Possible issue with validation set creation?

[pierotofy]

I was giving a good read to https://github.com/argosopentech/argos-train/blob/master/argostrain/data.py#L21 and noticed that the input is not shuffled.

Shouldn't the the input should be shuffled to have a better distribution? For example, if your first source is a wiktionary dataset, the program would be validating the dataset only against single word translations.