force scikit-image==0.18.3 (#182)

Summary: Pull Request resolved: #182

Reviewed By: galrotem

Differential Revision: D49295173

fbshipit-source-id: 53af6f9190368f6175fb9f900dc28e8ba5e34dfc

dev-requirements.txt

@@ -5,5 +5,5 @@ pytest-timeout
 pytest-cov
 Cython>=0.28.5
 scikit-learn>=0.22
-scikit-image>=0.18.3
+scikit-image==0.18.3
 torchtnt-nightly

torcheval/metrics/image/ssim.py

@@ -11,26 +11,14 @@
 
 import torch
 
-try:
-    from skimage.metrics import structural_similarity
-
-    _SKIMAGE_AVAILABLE = True
-except ImportError:
-    _SKIMAGE_AVAILABLE = False
+from skimage.metrics import structural_similarity
 
 from torcheval.metrics.metric import Metric
 
 
 TStructuralSimilarity = TypeVar("TStructuralSimilarity")
 
 
-def _validate_skimage_available() -> None:
-    if not _SKIMAGE_AVAILABLE:
-        raise RuntimeError(
-            "scikit-image is required. Please make sure ``scikit-image`` is installed."
-        )
-
-
 class StructuralSimilarity(Metric[torch.Tensor]):
     """
     Compute the structural similarity index (SSIM) between two sets of images.
@@ -44,8 +32,6 @@ def __init__(
         self: TStructuralSimilarity,
         device: Optional[torch.device] = None,
     ) -> None:
-        _validate_skimage_available()
-
         super().__init__(device=device)
 
         self._add_state("mssim_sum", torch.tensor(0, device=device, dtype=torch.float))