tokens: This work was supported in part by the Center for Data Science and the Center for Intelligent Information Retrieval , in part by the Chan Zuckerberg Initiative under the project “ Scientific Knowledge Base Construction , in part using high performance computing equipment obtained under a grant from the Collaborative RD Fund managed by the Massachusetts Technology Collaborative , in part by the National Science Foundation ( NSF ) grant numbers DMR-1534431 and IIS-1514053 .