PyTorch Training

This guide walks you through using PyTorch with Kubeflow.

Installing PyTorch Operator

If you haven’t already done so please follow the Getting Started Guide to deploy Kubeflow.

An alpha version of PyTorch support was introduced with Kubeflow 0.2.0. You must be using a version of Kubeflow between 0.2.0 and 0.3.5 to use this version.

More recently, a beta version of PyTorch support was introduced with Kubeflow 0.4.0. You must be using a version of Kubeflow newer than 0.4.0 to use this version.

Verify that PyTorch support is included in your Kubeflow deployment

Check that the PyTorch custom resource is installed

kubectl get crd

The output should include pytorchjobs.kubeflow.org

NAME                                           AGE
...
pytorchjobs.kubeflow.org                       4d
...

If it is not included you can add it as follows

cd ${KSONNET_APP}
ks pkg install kubeflow/pytorch-job
ks generate pytorch-operator pytorch-operator
ks apply ${ENVIRONMENT} -c pytorch-operator

Creating a PyTorch Job

You can create PyTorch Job by defining a PyTorchJob config file. See distributed MNIST example config file. You may change the config file based on your requirements.

cat pytorch_job_mnist.yaml

Deploy the PyTorchJob resource to start training:

kubectl create -f pytorch_job_mnist.yaml

You should now be able to see the created pods matching the specified number of replicas.

kubectl get pods -l pytorch_job_name=pytorch-tcp-dist-mnist

Training should run for about 10 epochs and takes 5-10 minutes on a cpu cluster. Logs can be inspected to see its training progress.

PODNAME=$(kubectl get pods -l pytorch_job_name=pytorch-tcp-dist-mnist,pytorch-replica-type=master,pytorch-replica-index=0 -o name)
kubectl logs -f ${PODNAME}

Monitoring a PyTorch Job

kubectl get -o yaml pytorchjobs pytorch-tcp-dist-mnist

See the status section to monitor the job status. Here is sample output when the job is successfully completed.

apiVersion: kubeflow.org/v1beta1
kind: PyTorchJob
metadata:
  clusterName: ""
  creationTimestamp: 2018-12-16T21:39:09Z
  generation: 1
  name: pytorch-tcp-dist-mnist
  namespace: default
  resourceVersion: "15532"
  selfLink: /apis/kubeflow.org/v1beta1/namespaces/default/pytorchjobs/pytorch-tcp-dist-mnist
  uid: 059391e8-017b-11e9-bf13-06afd8f55a5c
spec:
  cleanPodPolicy: None
  pytorchReplicaSpecs:
    Master:
      replicas: 1
      restartPolicy: OnFailure
      template:
        metadata:
          creationTimestamp: null
        spec:
          containers:
          - image: gcr.io/kubeflow-ci/pytorch-dist-mnist_test:1.0
            name: pytorch
            ports:
            - containerPort: 23456
              name: pytorchjob-port
            resources: {}
    Worker:
      replicas: 3
      restartPolicy: OnFailure
      template:
        metadata:
          creationTimestamp: null
        spec:
          containers:
          - image: gcr.io/kubeflow-ci/pytorch-dist-mnist_test:1.0
            name: pytorch
            ports:
            - containerPort: 23456
              name: pytorchjob-port
            resources: {}
status:
  completionTime: 2018-12-16T21:43:27Z
  conditions:
  - lastTransitionTime: 2018-12-16T21:39:09Z
    lastUpdateTime: 2018-12-16T21:39:09Z
    message: PyTorchJob pytorch-tcp-dist-mnist is created.
    reason: PyTorchJobCreated
    status: "True"
    type: Created
  - lastTransitionTime: 2018-12-16T21:39:09Z
    lastUpdateTime: 2018-12-16T21:40:45Z
    message: PyTorchJob pytorch-tcp-dist-mnist is running.
    reason: PyTorchJobRunning
    status: "False"
    type: Running
  - lastTransitionTime: 2018-12-16T21:39:09Z
    lastUpdateTime: 2018-12-16T21:43:27Z
    message: PyTorchJob pytorch-tcp-dist-mnist is successfully completed.
    reason: PyTorchJobSucceeded
    status: "True"
    type: Succeeded
  replicaStatuses:
    Master: {}
    Worker: {}
  startTime: 2018-12-16T21:40:45Z

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