Update functional_tensor.py

[puhuk]

To resolve issue #4818
Add assert function and logic after checking bound of image.

cc @vfdev-5 @datumbox

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💊 CI failures summary and remediations

As of commit f580b5f (more details on the Dr. CI page):

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• 1/1 failures introduced in this PR

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1 failure not recognized by patterns:

Job	Step	Action
binary_linux_conda_py3.9_cu111	packaging/build_conda.sh	🔁 rerun

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1 job timed out:

• binary_linux_conda_py3.9_cu111

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[fmassa]

Thanks!

Failures seems related, can you have a look?

[puhuk]

Sure, let me see and send again :)
Thanks for review.

[datumbox]

Thanks for the PR. I left a couple of comments, let me know what you think.

[datumbox]

@puhuk Thanks it looks great.

Before merging could you also add tests to cover for:

1. Corner cases such values right on the threshold
2. Ensure that the code fails when an incorrect value is passed

[puhuk]

@datumbox, sure let me add test.
But may I ask where can I add test and is there any code I can refer to?

[datumbox]

@puhuk You can find similar tests here.

I think we need two tests:

• One that receives an all white (255) 4x4 image and checks that the method works as expected for threshold 255.
• One that passes the wrong threshold and checks that it fails. Here is an example of a test that checks for failures.

[puhuk]

@datumbox Thanks for sharing! Let me check and send PR

[datumbox]

@puhuk Some of your tests are failing and they are related to your changes.

[puhuk]

@datumbox, I'm trying to fix this. Could you give me some time.

[datumbox]

@puhuk Sure thing. Sometimes contributors don't give access to the CircleCi and cant see the errors, so we give a nudge to ensure they are aware. Since you know it and actively work on it, there is no rush. :)

[datumbox]

Thanks @puhuk, I think we can simplify the unit-tests a bit. Let me know what you think.

[github-actions]

Hey @datumbox!

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