pytorch-lightning

7bbbe226 - Move `_POPTORCH_AVAILABLE` and `_IPU_AVAILABLE` (#16509)

Move `_POPTORCH_AVAILABLE` and `_IPU_AVAILABLE` (#16509) Co-authored-by: Nikhil Shenoy <nikhilshenoy@dhcp-128-189-225-225.ubcsecure.wireless.ubc.ca> Co-authored-by: Carlos Mocholí <carlossmocholi@gmail.com> Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>