**AlphaZero** is a reinforcement learning agent for playing board games such as Go, chess, and shogi. 

**Routed Attention** is an attention pattern proposed as part of the [Routing Transformer](https://paperswithcode.com/method/routing-transformer) architecture.  Each attention module
considers a clustering of the space: the current timestep only attends to context belonging to the same cluster. In other word, the current time-step query is routed to a limited number of context through its cluster assignment. This can be contrasted with [strided](https://paperswithcode.com/method/strided-attention) attention patterns and those proposed with the [Sparse Transformer](https://paperswithcode.com/method/sparse-transformer).

In the image to the right, the rows represent the outputs while the columns represent the inputs. The different colors represent cluster memberships for the output token.

Routing Attention

Efficient Content-Based Sparse Attention with Routing Transformers

AlphaZero

Mastering Chess and Shogi by Self-Play with a General Reinforcement Learning Algorithm

Transformer neural networks have achieved state-of-the-art results for unstructured data such as text and images but their adoption for graph-structured data has been limited. This is partly due to the difficulty of incorporating complex structural information in the basic transformer framework. We propose a simple yet powerful extension to the transformer - residual edge channels. The resultant framework, which we call Edge-augmented Graph Transformer (EGT), can directly accept, process and output structural information as well as node information. It allows us to use global self-attention, the key element of transformers, directly for graphs and comes with the benefit of long-range interaction among nodes. Moreover, the edge channels allow the structural information to evolve from layer to layer, and prediction tasks on edges/links can be performed directly from the output embeddings of these channels. In addition, we introduce a generalized positional encoding scheme for graphs based on Singular Value Decomposition which can improve the performance of EGT. Our framework, which relies on global node feature aggregation, achieves better performance compared to Convolutional/Message-Passing Graph Neural Networks, which rely on local feature aggregation within a neighborhood. We verify the performance of EGT in a supervised learning setting on a wide range of experiments on benchmark datasets. Our findings indicate that convolutional aggregation is not an essential inductive bias for graphs and global self-attention can serve as a flexible and adaptive alternative.

Source	Mastering Chess and Shogi by Self-Play with a General Reinforcement Learning Algorithm
Year	2000
Data Source	CC BY-SA - https://paperswithcode.com