Stephan Rabanser

Remove and replace DiscretePIT with more appropriate representations

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*Description of changes:* The `DiscretePIT` representation does not make much sense right now, since it requires the use of a quantile binning to be passed to it, which can be...

Representation models

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*Description of changes:* This PR updates four of our core models (SimpleFeedForward, DeepAR, Transformer, WaveNet) to the representations module (#755). This enables these models to deal with flexible input and...