directed-acyclic-graphs

问题 I use python binding to igraph to represent a directed tree. I would like to find all possible paths from one node in that graph to another one. Unfortunately, I couldn't find a ready to use function in igraph that performs this task? EDIT The concerns on infinite number of paths the graph I'm talking about is actually a directed acyclic graph (DAG) with a single root. It represents a unidirectional cascade of events that, on various levels of the cascade, can either split or join together.

问题 The Spark research paper has prescribed a new distributed programming model over classic Hadoop MapReduce, claiming the simplification and vast performance boost in many cases specially on Machine Learning. However, the material to uncover the internal mechanics on Resilient Distributed Datasets with Directed Acyclic Graph seems lacking in this paper. Should it be better learned by investigating the source code? 回答1: Even i have been looking in the web to learn about how spark computes the