Fix #941: Correctly define choices for --reward-model as a tuple#974

hwchen2017 merged 1 commit intodeepspeedai:masterdeepspeedai/DeepSpeedExamples:masterfrom

Flink-ddd:fix-argparser-bug-941Flink-ddd/DeepSpeedExamples:fix-argparser-bug-941Copy head branch name to clipboard