PMC:7128678 / 5299-5490 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T37","span":{"begin":0,"end":191},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The system was energy-minimized six times, switching between runs using the steepest descent gradients and runs using Polak–Ribière conjugate gradients until convergence to machine precision."}