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* replace assert with valueerror

* pytest should raise ValueError not AssertionError

* minor edit

* raise assert changed to raise valueerror in test

* Update torchvision/models/detection/backbone_utils.py
Co-authored-by: Aditya Oke <47158509+oke-aditya@users.noreply.github.com>

* Update torchvision/models/detection/backbone_utils.py
Co-authored-by: Aditya Oke <47158509+oke-aditya@users.noreply.github.com>

* minor edits

* minor edits

* added one test

* added another test

* added another test

* test for mobilenet

* ufmt formatting

* cant have unused variables

* suggested changes

* minor edit

* corrected bug pointed out by datumbox

* corrected bug pointed out by datumbox

* bug correction and shorten msg

* ufmt stuff

* resolved last comment
Co-authored-by: Abhijit Deo <72816663+abhi-glitchhg@users.noreply.github.com>
Co-authored-by: Aditya Oke <47158509+oke-aditya@users.noreply.github.com>
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>