An Empirical Study of Extrapolation in Text Generation with Scalar Control
We conduct an empirical evaluation of extrapolation performance when conditioning on scalar control inputs like desired output length, desired edit from an input sentence, and desired sentiment across three text generation tasks. Specifically, we examine a zero-shot setting where models are asked to generalize to ranges of control values not seen during training. We focus on evaluating popular embedding methods for scalar inputs, including both learnable and sinusoidal embeddings, as well as simpler approaches. Surprisingly, our findings indicate that the simplest strategy of using scalar inputs directly, without further encoding, most reliably allows for successful extrapolation.
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