[Bug] Check UnsharpenMask

[ternaus]

We have in Docstring:

blur_limit: maximum Gaussian kernel size for blurring the input image.
          Must be zero or odd and in range [0, inf). If set to 0 it will be computed from sigma
          as `round(sigma * (3 if img.dtype == np.uint8 else 4) * 2 + 1) + 1`.
          If set single value `blur_limit` will be in range (0, blur_limit).
          Default: (3, 7).
      sigma_limit: Gaussian kernel standard deviation. Must be in range [0, inf).
          If set single value `sigma_limit` will be in range (0, sigma_limit).
          If set to 0 sigma will be computed as `sigma = 0.3*((ksize-1)*0.5 - 1) + 0.8`. Default: 0.

But it does not look as it is happening in the code.

Check paper: arxiv.org/pdf/2107.10833.pdf