Training an Pretrained model on object detection task on single GPU

[letdivedeep]

Hi @WXinlong thanks for the wonderful work.

I want to train the pre-trained model on the downstream task of object detection. I used the pre-trained model of mocov2 with 800 epochs here

I have followed the following process
step 1: Install detectron2.

step 2: Convert a pre-trained MoCo model to detectron2's format:

python3 convert-pretrain-to-detectron2.py input.pth.tar output.pkl
Put dataset under "./datasets" directory, following the directory structure required by detectron2.

step 3: Run training:

python train_net.py --config-file configs/pascal_voc_R_50_C4_24k_moco.yaml \
 --num-gpus 1 MODEL.WEIGHTS ./output.pkl

The only change I did is used a single gpu rather than 8 gpu

I am getting the following error an

[08/31 12:42:12] fvcore.common.checkpoint WARNING: Some model parameters or buffers are not found in the checkpoint:
�[34mproposal_generator.rpn_head.anchor_deltas.{bias, weight}�[0m
�[34mproposal_generator.rpn_head.conv.{bias, weight}�[0m
�[34mproposal_generator.rpn_head.objectness_logits.{bias, weight}�[0m
�[34mroi_heads.box_predictor.bbox_pred.{bias, weight}�[0m
�[34mroi_heads.box_predictor.cls_score.{bias, weight}�[0m
�[34mroi_heads.res5.norm.{bias, running_mean, running_var, weight}�[0m
[08/31 12:42:12] fvcore.common.checkpoint WARNING: The checkpoint state_dict contains keys that are not used by the model:
  �[35mstem.fc.0.{bias, weight}�[0m
  �[35mstem.fc.2.{bias, weight}�[0m
[08/31 12:42:12] d2.engine.train_loop INFO: Starting training from iteration 0
[08/31 12:42:13] d2.engine.train_loop ERROR: Exception during training:
Traceback (most recent call last):
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/engine/train_loop.py", line 149, in train
    self.run_step()
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/engine/defaults.py", line 493, in run_step
    self._trainer.run_step()
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/engine/train_loop.py", line 273, in run_step
    loss_dict = self.model(data)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/modeling/meta_arch/rcnn.py", line 154, in forward
    features = self.backbone(images.tensor)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/modeling/backbone/resnet.py", line 445, in forward
    x = self.stem(x)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/modeling/backbone/resnet.py", line 356, in forward
    x = self.conv1(x)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/ubuntu/livesense/Detectron2/detectron2/detectron2/layers/wrappers.py", line 88, in forward
    x = self.norm(x)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/module.py", line 727, in _call_impl
    result = self.forward(*input, **kwargs)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/nn/modules/batchnorm.py", line 519, in forward
    world_size = torch.distributed.get_world_size(process_group)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/distributed/distributed_c10d.py", line 638, in get_world_size
    return _get_group_size(group)
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/distributed/distributed_c10d.py", line 220, in _get_group_size
    _check_default_pg()
  File "/home/ubuntu/anaconda3/envs/detectron_env/lib/python3.8/site-packages/torch/distributed/distributed_c10d.py", line 210, in _check_default_pg
    assert _default_pg is not None, \
AssertionError: Default process group is not initialized
[08/31 12:42:13] d2.engine.hooks INFO: Total training time: 0:00:00 (0:00:00 on hooks)
[08/31 12:42:13] d2.utils.events INFO:  iter: 0    lr: N/A  max_mem: 207M

how can we run the training on a single GPU ?
attached are the logs for details
log 3.23.54 PM.txt

[Tyanshan]

Have you solved the problem yet？

[JamesZWalker]

Have you solved the problem yet？