ImportError: cannot import name 'Di1stributedDataParallel' from 'apex.parallel'

[HePengguang]

The paltform is window10, and there is only one GPU=RTX GeForce 3080
pytorch version==1.7.1,
tensorboard version ==1.15.0,
apex version==0.1
Q: Every time when i tried to train with the command "train.py --dataset CUB_200_2011 --split overlap --num_steps 10000 --fp16 --name sample_run", it always gave me a error feedback, like "ImportError: cannot import name 'Di1stributedDataParallel' from 'apex.parallel' "
Any guy know what is the reason causing this error? If you know some likely reasons, please tell me, thank you so much. God bless you!

[HePengguang]

maybe it's beacause the platform, we can directly annotate the line "from apex.parallel import Di1stributedDataParallel as DDP"

[Kelly510]

I had the same problem. It can be solved by installing apex in apex_no_distributed branch of this repo. The commands are as follows.

git clone https://github.com/ptrblck/apex.git
cd apex
git checkout apex_no_distributed
pip install -v --no-cache-dir ./