Replace Pytorch with PyTorch

[tenzen-y]

What this PR does / why we need it:
I replaced Pytoch with PyTorch.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

[coveralls]

Pull Request Test Coverage Report for Build 5730657897

• 17 of 34 (50.0%) changed or added relevant lines in 8 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.02%) to 40.336%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controller.v1/register_controller.go	0	1	0.0%
pkg/controller.v1/pytorch/pytorchjob_controller.go	10	17	58.82%
pkg/apis/kubeflow.org/v1/pytorch_defaults.go	0	9	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/apis/kubeflow.org/v1/pytorch_defaults.go	2	39.62%
pkg/controller.v1/mpi/mpijob_controller.go	2	80.12%

Totals
Change from base Build 5728469832:	-0.02%
Covered Lines:	3861
Relevant Lines:	9572

---

💛 - Coveralls

[terrytangyuan]

Does this have to be "PyTorch" too?

[tenzen-y]

@terrytangyuan I think that we need not change both values since the singular is defined as a lowercase in general, and all framework names are defined as a lower case such as tensorflow:

CRD doc: https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/

https://github.com/kubeflow/training-operator/blob/de7c73ef6fdf7b8e3283bfd027b9dc07f6400400/pkg/apis/kubeflow.org/v1/tensorflow_types.go#L38

https://github.com/kubeflow/training-operator/blob/de7c73ef6fdf7b8e3283bfd027b9dc07f6400400/pkg/apis/kubeflow.org/v1/mxnet_types.go#L38

[terrytangyuan]

/lgtm

[tenzen-y]

@terrytangyuan Thank you for the review!
Could you add an /approve label and restart https://github.com/kubeflow/training-operator/actions/runs/5730657897/job/15529894448?pr=1874?

[terrytangyuan]

/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tenzen-y, terrytangyuan

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [terrytangyuan]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[terrytangyuan]

We could consider adding retries to failed builds.

[tenzen-y]

We could consider adding retries to failed builds.

Instead of automatically retrying, Introducing ChatOps to retry jobs manually might be better for finding the flakiness.