Z-GCNETs: Time Zigzags at Graph Convolutional Networks for Time Series Forecasting Z-GCNETs Code for paper Z-GCNETs: Time Zigzags at Graph Convolutional Networks for Time Series Forecasting (ICML 2021). Requirements Python 3.6.5, Pytorch >=1.4.0, gudhi 3.3.0, networkx 2.3.0, dionysus 2.0.8, ripser 0.4.1, and persim 0.1.1.