Xingyu Feng issues

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                                            Xingyu Feng

Random float problem in some compiler or platform

### 1. **Describe the bug** In some compiler or platform, `std::mt19937::result_type` will not be unsigned int, this will cause Float() not in 0~1 range. https://github.com/TheCherno/Walnut/blob/3b8e414fdecfc6c8b58816106fe8d912bd172e31/Walnut/src/Walnut/Random.h#L48 ![图片](https://user-images.githubusercontent.com/50624245/215633484-e4526a5a-9256-4250-a53e-da7fd42bf958.png) ![图片](https://user-images.githubusercontent.com/50624245/215635080-44f324de-d53b-4c7d-ba79-8bd0486cb81b.png) ### 2. **Desktop**...

Re-focal loss equation error

![image](https://github.com/HiLab-git/SCPM-Net/assets/50624245/6ee9f344-acf1-48a4-b453-690d77398c17) I think p_j should be 1-p when it's negative sample and p in positive sample, p is the probability of being a nodule. @Luoxd1996