This example shows how to use Arena to submit a pytorch distributed job. This example will download the source code from git url.

The first step is to check the available resources.

➜ arena top node
NAME                       IPADDRESS     ROLE    STATUS  GPU(Total)  GPU(Allocated)
cn-huhehaote.172.16.0.205  172.16.0.205  master  ready   0           0
cn-huhehaote.172.16.0.206  172.16.0.206  master  ready   0           0
cn-huhehaote.172.16.0.207  172.16.0.207  master  ready   0           0
cn-huhehaote.172.16.0.208  172.16.0.208  <none>  ready   4           0
cn-huhehaote.172.16.0.209  172.16.0.209  <none>  ready   4           0
cn-huhehaote.172.16.0.210  172.16.0.210  <none>  ready   4           0
-----------------------------------------------------------------------------------------
Allocated/Total GPUs In Cluster:
0/12 (0%)

There are 3 available nodes with GPU for running training jobs.

Submit a pytorch distributed training job with 2 nodes and one gpu card, this example download the source code from Alibaba Cloud code.

➜ arena --loglevel info submit pytorch \
        --name=pytorch-dist-git \
        --gpus=1 \
        --workers=2 \
        --image=registry.cn-huhehaote.aliyuncs.com/lumo/pytorch-with-tensorboard:1.5.1-cuda10.1-cudnn7-runtime \
        --sync-mode=git \
        --sync-source=https://code.aliyun.com/370272561/mnist-pytorch.git \
        "python /root/code/mnist-pytorch/mnist.py --backend gloo"
configmap/pytorch-dist-git-pytorchjob created
configmap/pytorch-dist-git-pytorchjob labeled
pytorchjob.kubeflow.org/pytorch-dist-git created
INFO[0000] The Job pytorch-dist-git has been submitted successfully
INFO[0000] You can run `arena get pytorch-dist-git --type pytorchjob` to check the job status

the source code will be downloaded and extracted to the directory code/ of the working directory. The default working directory is /root, you can also specify by using --workingDir.

workers is the total number of nodes participating in the training (must be a positive integer and greater than or equal to 1), including rank0 node used to establish communication (corresponding to the master node in the pytorch-operator). The default value of the parameter is 1, which can not be set, as a stand-alone job.

List all the jobs.

➜ arena list
NAME                          STATUS     TRAINER     AGE  NODE
pytorch-dist-git              SUCCEEDED  PYTORCHJOB  23h  N/A

Get the details of the this job. There are 2 instances of this job, and instance pytorch-dist-git-master-0 is the rank0. Arena simplifies the process of submitting distributed jobs with PyTorch-Operator. A Service will be created for this master instance for other nodes to access through the name of Service in PyTorch-Operator, and inject environment variables into each instance: MASTER_PORT、MASTER_ADDR、WORLD_SIZE、RANK. Initialization of distributed process group for pytorch（ dist.init_ process_ group). MASTER_PORT auto assign, MASTER_ADDR is "localhost" in the master instance, and other instances are Service name of the master,WORLD_SIZE is the total number of instances, and RANK is the serial number of the current calculation node, and master is 0, Worker instance is the index of instance name suffix plus one. For example, in the following example, RANK of instance pytorch-dist-git-worker-0 is 0 + 1 = 1 In Arena, the value filled in by the parameter --workers contains one master instance, because master is also involved in training.
```
➜ arena get pytorch-local-git
STATUS: SUCCEEDED
NAMESPACE: default
PRIORITY: N/A
TRAINING DURATION: 1m

NAME              STATUS     TRAINER     AGE  INSTANCE                   NODE
pytorch-dist-git  SUCCEEDED  PYTORCHJOB  23h  pytorch-dist-git-master-0  172.16.0.210
pytorch-dist-git  SUCCEEDED  PYTORCHJOB  23h  pytorch-dist-git-worker-0  172.16.0.210
```

Check logs.

➜ arena logs pytorch-dist-git
WORLD_SIZE: 2, CURRENT_RANK: 0
args: Namespace(backend='gloo', batch_size=64, data='/root/code/mnist-pytorch', dir='/root/code/mnist-pytorch/logs', epochs=1, log_interval=10, lr=0.01, momentum=0.5, no_cuda=False, save_model=False, seed=1, test_batch_size=1000)
Using CUDA
Using distributed PyTorch with gloo backend
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:541: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint8 = np.dtype([("qint8", np.int8, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:542: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_quint8 = np.dtype([("quint8", np.uint8, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:543: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint16 = np.dtype([("qint16", np.int16, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:544: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_quint16 = np.dtype([("quint16", np.uint16, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:545: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint32 = np.dtype([("qint32", np.int32, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:550: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  np_resource = np.dtype([("resource", np.ubyte, 1)])
Train Epoch: 1 [0/60000 (0%)]	loss=2.3000
Train Epoch: 1 [640/60000 (1%)]	loss=2.2135
Train Epoch: 1 [1280/60000 (2%)]	loss=2.1705
Train Epoch: 1 [1920/60000 (3%)]	loss=2.0767
Train Epoch: 1 [2560/60000 (4%)]	loss=1.8681
Train Epoch: 1 [3200/60000 (5%)]	loss=1.4142
Train Epoch: 1 [3840/60000 (6%)]	loss=1.0009
...

For multi instances of distributed job, the default output is the log of rank0 (the instance is the master node). If you want to view the log of the specific instance, you can view it by -i instance name, for example:

➜ arena logs pytorch-dist-git -i pytorch-dist-git-worker-0
WORLD_SIZE: 2, CURRENT_RANK: 1
args: Namespace(backend='gloo', batch_size=64, data='/root/code/mnist-pytorch', dir='/root/code/mnist-pytorch/logs', epochs=1, log_interval=10, lr=0.01, momentum=0.5, no_cuda=False, save_model=False, seed=1, test_batch_size=1000)
Using CUDA
Using distributed PyTorch with gloo backend
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:541: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint8 = np.dtype([("qint8", np.int8, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:542: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_quint8 = np.dtype([("quint8", np.uint8, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:543: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint16 = np.dtype([("qint16", np.int16, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:544: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_quint16 = np.dtype([("quint16", np.uint16, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:545: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  _np_qint32 = np.dtype([("qint32", np.int32, 1)])
/opt/conda/lib/python3.7/site-packages/tensorboard/compat/tensorflow_stub/dtypes.py:550: FutureWarning: Passing (type, 1) or '1type' as a synonym of type is deprecated; in a future version of numpy, it will be understood as (type, (1,)) / '(1,)type'.
  np_resource = np.dtype([("resource", np.ubyte, 1)])
Train Epoch: 1 [0/60000 (0%)]	loss=2.3000
Train Epoch: 1 [640/60000 (1%)]	loss=2.2135
Train Epoch: 1 [1280/60000 (2%)]	loss=2.1705
Train Epoch: 1 [1920/60000 (3%)]	loss=2.0767
Train Epoch: 1 [2560/60000 (4%)]	loss=1.8681
Train Epoch: 1 [3200/60000 (5%)]	loss=1.4142

In addition, user can view the logs of the last few lines through the parameter -t lines num, such as:

➜ arena logs pytorch-dist-git -i pytorch-dist-git-worker-0 -t 5
Train Epoch: 1 [58880/60000 (98%)]	loss=0.2048
Train Epoch: 1 [59520/60000 (99%)]	loss=0.0646

accuracy=0.9661

For more parameters, see arena logs -- help

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