tfjob(v1alpha2): Add validation (#874)
tfjob(v1alpha2): Add validation (#874)

* tfjob(v1alpha2): Add validation

Signed-off-by: Ce Gao <1d82c7e569a19de560a5cb3a123e2745e610ad0f@caicloud.io>

* tf-job-operator: Add comments

Signed-off-by: Ce Gao <1d82c7e569a19de560a5cb3a123e2745e610ad0f@caicloud.io>

kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow,kubeflow/kubeflow