Twitter corpus for Sentiment Analysis from a class (cs224n)at Stanford.
Class page:
https://sites.google.com/site/twittersentimenthelp/for-researchers#Where_is_the_Tweet_corpus_8553
http://www.stanford.edu/~alecmgo/cs224n
A collection of index based algorithms for comparison purposes. Also contains RStarTrees for indexing and the DBSCAN algorithm. Yet, this library is not intended as a library and really is complicated to use (see http://elki.dbs.ifi.lmu.de/wiki/HowTo/InvokingELKIFromJava).
X. Zheng, C. Dan, B. Aragam, P. Ravikumar, and E. Xing. Proceedings of the Twenty Third International Conference on Artificial Intelligence and Statistics, volume 108 of Proceedings of Machine Learning Research, page 3414--3425. PMLR, (26--28 Aug 2020)
Y. Zheng, F. Liu, and H. Hsieh. International Conference on Knowledge Discovery and Data Mining (SIGKDD), page 1436--1444. New York, NY, USA, ACM, (2013)