DeepSpeed

e1949565 - Support iterators with incompletely defined __len__ functions (#2445)

Support iterators with incompletely defined __len__ functions (#2445) * support iterators with incompletely defined __len__ functions * whitespace fix --------- Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com> Co-authored-by: Logan Adams <loadams@microsoft.com>