“cde6241a1bc1c4c42d3991d5a394f7f1398c702d”上不存在“python/paddle/fluid/tests/test_communicator.py”
* add sparse support for sum op * typo fix * fix gpu build error * fix unittest error * typo fix * infer var type and shape in op_test * follow comments * fix build error * bypass some unittests depend on NetOp