* fix fp16 for xglm * Removed misleading comment * Fix undefined variable Co-authored-by: Gabriele Sarti <gsarti@amazon.com> Co-authored-by: ydshieh <ydshieh@users.noreply.github.com> Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>