refactor: remove redundant line as .reset() is call in Metrics().__init() (#3044)

* refactor: remove redundant line as .reset() is call in Metrics().__init__()

* fix: move kernel creation back into init, and removed it from reset

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Co-authored-by: vfdev <[email protected]>

Author: MarcBresson

ignite/metrics/ssim.py

@@ -108,7 +108,6 @@ def __init__(
     def reset(self) -> None:
         self._sum_of_ssim = torch.tensor(0.0, dtype=torch.float64, device=self._device)
         self._num_examples = 0
-        self._kernel = self._gaussian_or_uniform_kernel(kernel_size=self.kernel_size, sigma=self.sigma)
 
     def _uniform(self, kernel_size: int) -> torch.Tensor:
         kernel = torch.zeros(kernel_size)