Added Binary Focal Cross Entropy (#10674)

* Added Binary Focal Cross Entropy

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* Fixed Issue

* Fixed Issue

* Added BFCE loss to loss_functions.py

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* Update machine_learning/loss_functions.py

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tianyi Zheng <[email protected]>