send and recv ok
CommHandlePy
Fix core
handle and graph ok demo
Send recv performance ok
send recv gpu
all gather/all reduce/all to all/reduce scatter in ascend
all gather/all reduce/all to all/reduce scatter in gpu
Simplifying comm codes in ascend
add communication stream
support offset
add send and recv
fix all to all
Fix group in allreduce and allgather
reduce record event time
add ut
comm grad
add docs