Adapt TFJob examples to TensorFlow v2

[tenzen-y]

Our TFJob examples are using TensorFlow v1, but that version is too old.

• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/tf_sample/Dockerfile#L1
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/dist-mnist/Dockerfile#L15
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/distribution_strategy/estimator-API/Dockerfile#L1
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/mnist_with_summaries/Dockerfile#L15

So, all TFJob examples should be adapted to TensorFlow v1.

Contributors should address the following items:

• Upgrade TensorFlow version in all Dockerfiles to v2
• Adapt training codes to TensorFlow v2 API

/good-first-issue

[google-oss-prow]

@tenzen-y:
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Please ensure the request meets the requirements listed here.

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In response to this:

Our TFJob examples are using TensorFlow v1, but that version is too old.

• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/tf_sample/Dockerfile#L1
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/dist-mnist/Dockerfile#L15
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/distribution_strategy/estimator-API/Dockerfile#L1
• https://github.com/kubeflow/training-operator/blob/e2d6ba41d4d11eb333a80cb95a1c22a29e3da156/examples/tensorflow/mnist_with_summaries/Dockerfile#L15

So, all TFJob examples should be adapted to TensorFlow v1.

Contributors should address the following items:

• Upgrade TensorFlow version in all Dockerfiles to v2
• Adapt training codes to TensorFlow v2 API

/good-first-issue

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[sandipantech]

I am interested in working on this.

/assign

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[tenzen-y]

/remove-lifecycle stale

[tenzen-y]

Based on this comment: #2023 (comment)

/unassign @sandipantech

[YosiElias]

I'm interested in working on this, any objection?

[tenzen-y]

I'm interested in working on this, any objection?

Feel free to assign this yourself with /assign.

[YosiElias]

/assign