Imagination is All You Need! Curved Contrastive Learning for Abstract Sequence Modeling Utilized on Long Short-Term Dialogue Planning

Anonymous

Abstract: Motivated by the entailment property of multi-turn dialogues through contrastive learning sentence embeddings, we introduce a novel technique, Curved Contrastive Learning (CCL), for generating semantically meaningful and conversational curved utterance embeddings that can be compared using cosine similarity. Inspired by the curvature of space-time, we define the curved property of these embeddings as the semantic space curved by the relative turn distance (our time dimension) of utterance pairs. The resulting bi-encoder models can guide transformers as a response ranking model towards a goal in a zero-shot fashion by projecting the goal utterance and the corresponding reply candidates into a latent space. Here the cosine similarity indicates the distance/reachability of a candidate utterance toward the corresponding goal. Furthermore, we explore how these forward-entailing language representations can be utilized for assessing the likelihood of sequences by the entailment strength i.e. through the cosine similarity of its individual members (encoded separately) as an emergent property in the curved space. This allows us to imagine the likelihood of future patterns in dialogues, specifically by ordering/identifying future goal utterances that are multiple turns away, given a dialogue context. As part of our analysis, we investigate characteristics that make conversations (un)plannable and find strong evidence of planning capability over multiple turns (in 61.56% over 3 turns) in conversations from the DailyDialog dataset. Finally, we will show how we can exploit the curved property to rank one million utterance & context pairs, in terms of GPU computation time over 7 million times faster than DialogRPT while being on average 2.8% qualitatively superior for sequences longer than 2 turns.

Paper Type: long

Research Area: Dialogue and Interactive Systems