Multiple GPU support about yolov5 HOT 10 CLOSED

Excellent, thanks for the fast response and hard work. This thing is amazing!

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@HaxThePlanet good news: yolov5 supports multi-gpu out of the box. Some examples:

python train.py  # will use ALL available cuda resources found on system
python train.py --device 0,1  # specify devices
python train.py --device 0  # specify 1 device 
python train.py --device cpu  # force cpu usage

test.py works exactly the same way. detect.py accepts a --device argument, but is limited to 1 gpu.

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when I type the command:
python train.py --data coco.yaml --cfg yolov5s.yaml --weights '' --batch-size 16
then, it will show below:
{'lr0': 0.01, 'momentum': 0.937, 'weight_decay': 0.0005, 'giou': 0.05, 'cls': 0.58, 'cls_pw': 1.0, 'obj': 1.0, 'obj_pw': 1.0, 'iou_t': 0.2, 'anchor_t': 4.0, 'fl_gamma': 0.0, 'hsv_h': 0.014, 'hsv_s': 0.68, 'hsv_v': 0.36, 'degrees': 0.0, 'translate': 0.0, 'scale': 0.5, 'shear': 0.0}
Namespace(adam=False, batch_size=16, bucket='', cache_images=False, cfg='./models/yolov5s.yaml', data='./data/coco.yaml', device='', epochs=300, evolve=False, img_size=[640, 640], multi_scale=False, name='', nosave=False, notest=False, rect=False, resume=False, single_cls=False, weights='')
Using CUDA Apex device0 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device1 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device2 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device3 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device4 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device5 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device6 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
device7 _CudaDeviceProperties(name='GeForce RTX 2080 Ti', total_memory=11019MB)
Optimizer groups: 54 .bias, 60 conv.weight, 51 other

bug report as below:
/share/home/xx/anaconda3/envs/pt1.5.0/lib/python3.7/site-packages/torch/nn/parallel/distributed.py:303: UserWarning: Single-Process Multi-GPU is not the recommended mode for DDP. In this mode, each DDP instance operates on multiple devices and creates multiple module replicas within one process. The overhead of scatter/gather and GIL contention in every forward pass can slow down training. Please consider using one DDP instance per device or per module replica by explicitly setting device_ids or CUDA_VISIBLE_DEVICES. NB: There is a known issue in nn.parallel.replicate that prevents a single DDP instance to operate on multiple model replicas.
"Single-Process Multi-GPU is not the recommended mode for "
Traceback (most recent call last):
File "train.py", line 400, in
train(hyp)
File "train.py", line 152, in train
model = torch.nn.parallel.DistributedDataParallel(model)
File "/share/home/xx/anaconda3/envs/pt1.5.0/lib/python3.7/site-packages/torch/nn/parallel/distributed.py", line 287, in init
self._ddp_init_helper()
File "/share/home/xx/anaconda3/envs/pt1.5.0/lib/python3.7/site-packages/torch/nn/parallel/distributed.py", line 380, in _ddp_init_helper
expect_sparse_gradient)
RuntimeError: Model replicas must have an equal number of parameters.

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@AIFAN-Lab thanks for the bug report. I tested on two GPUs today and everything worked well. Can you try to reproduce this in our docker image to see if it's an environment issue?

• Docker Image https://hub.docker.com/r/ultralytics/yolov5. See Docker Quickstart Guide

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Ok. I will test the Docker. And report later.

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Is it still necessary to train the first 1000 or so iterations on a single GPU?

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@HaxThePlanet that's never been necessary.

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@HaxThePlanet good news: yolov5 supports multi-gpu out of the box. Some examples:

python train.py  # will use ALL available cuda resources found on system
python train.py --device 0,1  # specify devices
python train.py --device 0  # specify 1 device 
python train.py --device cpu  # force cpu usage

test.py works exactly the same way. detect.py accepts a --device argument, but is limited to 1 gpu.

would you pls support multi-gpus while using detect.py ?

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@liangshi036 we don't have the resources to implement suggestions, but you can do this yourself and submit a PR!

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