Add model_transform in create supervised trainer

[guptaaryan16]

Fixes #2837

Description: I have added the function for model_transform

Check list:

• New tests are added (if a new feature is added)
• New doc strings: description and/or example code are in RST format
• Documentation is updated (if required)

[vfdev-5]

@guptaaryan16 thanks for the PR ! Looks good to me. Just few minor improvements and please add a test into https://github.com/pytorch/ignite/blob/master/tests/ignite/engine/test_create_supervised.py

[vfdev-5]

cc @david-waterworth if case if you would like to review this PR

[vfdev-5]

@guptaaryan16 thanks for the update but let's improve test code

[vfdev-5]

@guptaaryan16 can you please update this PR to make it merged

[guptaaryan16]

Hey @vfdev-5 , sure I am making the changes by today or tomorrow EOD and I apologise for the delay in the same

[guptaaryan16]

Hey @vfdev-5 can you give me an idea on how to update the API doc

[vfdev-5]

@guptaaryan16 I pushed this PR : guptaaryan16#1 to your master branch on how to update the tests. Could you please merge this PR quickly to unblock this PR as we are planning the release. Thanks

[guptaaryan16]

Okay I am working in this issue and hope to complete this today. Thanks for helping with the tests should I update the docs of the API

[vfdev-5]

Okay I am working in this issue and hope to complete this today. Thanks for helping with the tests should I update the docs of the API

Thanks @guptaaryan16 ! Can you add versionchanged into the docstrings and also usage example can be helpful

ignite/ignite/engine/__init__.py

Lines 90 to 91 in d820c82

	.. versionchanged:: 0.4.7
	Added Gradient Accumulation.

    .. versionchanged:: 0.4.7
        Added `model_transform` to transform model's output

[guptaaryan16]

@vfdev-5 I don't know why but to make the tests work I had to remove the bias variable in the tests as it gives a NoneType error

[vfdev-5]

@vfdev-5 I don't know why but to make the tests work I had to remove the bias variable in the tests as it gives a NoneType error

I checked the tests locally and they were passing. Let's revert this change and see the exact error message

[vfdev-5]

OK, I see, we have to remove all related lines:

model.fc.bias.data.zero_()

assert model.fc.bias.item() == approx(0.0)

[vfdev-5]

Thanks @guptaaryan16