Neural Implicit Action Fields: From Discrete Waypoints to Continuous Functions for Vision-Language-Action Models

• URL: http://arxiv.org/abs/2603.01766v1
• Date: Mon, 02 Mar 2026 11:48:24 GMT
• Title: Neural Implicit Action Fields: From Discrete Waypoints to Continuous Functions for Vision-Language-Action Models
• Abstract summary: We propose a paradigm shift that reformulates action prediction from discrete waypoints to continuous action function regression.<n>Our approach achieves state-of-the-art results on CALVIN and LIBERO benchmarks across diverse backbones.
• Score: 35.98187913967879
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Despite the rapid progress of Vision-Language-Action (VLA) models, the prevailing paradigm of predicting discrete waypoints remains fundamentally misaligned with the intrinsic continuity of physical motion. This discretization imposes rigid sampling rates, lacks high-order differentiability, and introduces quantization artifacts that hinder precise, compliant interaction. We propose Neural Implicit Action Fields (NIAF), a paradigm shift that reformulates action prediction from discrete waypoints to continuous action function regression. By utilizing an MLLM as a hierarchical spectral modulator over a learnable motion prior, NIAF synthesizes infinite-resolution trajectories as continuous-time manifolds. This formulation enables analytical differentiability, allowing for explicit supervision of velocity, acceleration, and jerk to ensure mathematical consistency and physical plausibility. Our approach achieves state-of-the-art results on CALVIN and LIBERO benchmarks across diverse backbones. Furthermore, real-world experiments demonstrate that NIAF enables stable impedance control, bridging the gap between high-level semantic understanding and low-level dynamic execution.

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