Autonomous agents play a crucial role in advancing Artificial General Intelligence, enabling problem decomposition and tool orchestration through Large Language Models (LLMs). However, existing paradigms face a critical trade-off. On one hand, reusable fixed workflows require manual reconfiguration upon environmental changes; on the other hand, flexible reactive loops fail to distill reasoning progress into transferable structures. We introduce Hierarchical Variable Agent (HiVA), a novel framework modeling agentic workflows as self-organized graphs with the Semantic-Topological Evolution (STEV) algorithm, which optimizes hybrid semantic-topological spaces using textual gradients as discrete-domain surrogates for backpropagation. The iterative process comprises Multi-Armed Bandit-infused forward routing, diagnostic gradient generation from environmental feedback, and coordinated updates that co-evolve individual semantics and topology for collective optimization in unknown environments. Experiments on dialogue, coding, Long-context Q&A, mathematical, and agentic benchmarks demonstrate improvements of 5-10% in task accuracy and enhanced resource efficiency over existing baselines, establishing HiVA's effectiveness in autonomous task execution.

What makes a good movie trailer? It's a big challenge to answer this question because of the complexity of multimedia in both low level sensory features and high level semantic features. However, human perception and reactivity could be straightforward evidence for evaluation. Modern Electro-encephalography (EEG) technology provides measurement of consequential brain neural activity to external stimuli. Meanwhile, visual perception and attention could be captured and interpreted by Eye Tracking technology. Intuitively, simultaneous EEG and Eye Tracker recording of human audience with multimedia stimuli could bridge the gap between human comprehension and multimedia analysis, and provide a new way for movie trailer evaluation. In this paper, we propose a novel platform to simultaneously record EEG and eye movement for participants with video stimuli by integrating 256-channel EEG, Eye Tracker and video display device as a system. Based on the proposed system a novel experiment has been designed, in which independent and joint features of EEG and Eye tracking data were mined to evaluate the movie trailer. Our analysis has shown interesting features that are corresponding with trailer quality and video shoot changes.