[Feature request] Be able to remove a specific sample of the dataset
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Oh yes you can now do that with the `dataset.filter()` method that was added in #214 
As mentioned in #117, it's currently not possible to remove a sample of the dataset.

But it is a important use case : After applying some preprocessing, some samples might be empty for example. We should be able to remove these samples from the dataset, or at least mark them as `removed` so when iterating the dataset, we don't iterate these samples.

I think it should be a feature. What do you think ?

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Any work-around in the meantime ?
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