* 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 <tianyizheng02@gmail.com>