保姆级分享！ALOHA：低成本双臂机器人结合模仿学习经典工作

Core Viewpoint - The article discusses the ALOHA system, a low-cost open-source hardware system designed for bimanual teleoperation, emphasizing its potential to perform precise manipulation tasks using affordable components and advanced learning algorithms [4][5][8]. Group 1: ALOHA System Overview - ALOHA is a low-cost system costing less than $20,000, designed to enable precise manipulation tasks using two low-cost robotic arms and 3D-printed components [7][8]. - The system utilizes end-to-end imitation learning to perform tasks by collecting real demonstrations from a custom remote operation interface [8][10]. Group 2: Challenges in Imitation Learning - Imitation learning faces challenges such as compounding errors, where small prediction errors accumulate, leading to significant deviations from expert behavior [9][12]. - The article highlights the difficulty of modeling complex physical interactions in tasks, suggesting that learning policies directly from demonstrations is more effective than modeling the entire environment [9][12]. Group 3: Action Chunking with Transformers (ACT) - The ACT algorithm addresses compounding errors by predicting sequences of actions rather than single steps, improving performance in tasks with high complexity [12][13]. - The algorithm has demonstrated an 80-90% success rate in tasks with only 10 minutes of demonstration data [12]. Group 4: Hardware Specifications - The ALOHA system is built on principles of low cost, versatility, user-friendliness, repairability, and ease of construction, utilizing ViperX 6-DoF robotic arms [17][18]. - The system is designed to perform various tasks, including precise, contact-based, and dynamic operations [20][22]. Group 5: Data Collection and Training - The system collects human demonstrations to train the policy, focusing on the leader robot's joint positions to capture the operator's intent and force feedback [23][25]. - The training process involves using a conditional variational autoencoder (CVAE) to model human data and improve learning from noisy demonstrations [33][55]. Group 6: Experimental Results - The article presents experimental results showing that action chunking and temporal ensembling significantly enhance the performance of the ACT algorithm [52][54]. - The necessity of high-frequency control is emphasized, with findings indicating that a control frequency of 50Hz allows for more precise and agile task execution [56].