wrap numba imports in try except (#69)

scoringrules/core/crps/__init__.py

@@ -23,7 +23,12 @@
     t,
     uniform,
 )
-from ._gufuncs import estimator_gufuncs, quantile_pinball_gufunc
+
+try:
+    from ._gufuncs import estimator_gufuncs, quantile_pinball_gufunc
+except ImportError:
+    estimator_gufuncs = None
+    quantile_pinball_gufunc = None
 
 __all__ = [
     "ensemble",

scoringrules/core/energy/__init__.py

@@ -1,8 +1,14 @@
-from ._gufuncs import (
-    _energy_score_gufunc,
-    _owenergy_score_gufunc,
-    _vrenergy_score_gufunc,
-)
+try:
+    from ._gufuncs import (
+        _energy_score_gufunc,
+        _owenergy_score_gufunc,
+        _vrenergy_score_gufunc,
+    )
+except ImportError:
+    _energy_score_gufunc = None
+    _owenergy_score_gufunc = None
+    _vrenergy_score_gufunc = None
+
 from ._score import energy_score as nrg
 from ._score import owenergy_score as ownrg
 from ._score import vrenergy_score as vrnrg

scoringrules/core/error_spread/__init__.py

@@ -1,4 +1,8 @@
-from ._gufunc import _error_spread_score_gufunc as _ess_gufunc
+try:
+    from ._gufunc import _error_spread_score_gufunc as _ess_gufunc
+except ImportError:
+    _ess_gufunc = None
+
 from ._score import error_spread_score as ess
 
 __all__ = ["ess", "_ess_gufunc"]

scoringrules/core/interval/__init__.py

@@ -1,4 +1,9 @@
-from ._gufunc import _interval_score_gufunc, _weighted_interval_score_gufunc
+try:
+    from ._gufunc import _interval_score_gufunc, _weighted_interval_score_gufunc
+except ImportError:
+    _interval_score_gufunc = None
+    _weighted_interval_score_gufunc = None
+
 from ._score import _interval_score, _weighted_interval_score
 
 __all__ = [

scoringrules/core/variogram/__init__.py

@@ -1,8 +1,14 @@
-from ._gufuncs import (
-    _owvariogram_score_gufunc,
-    _variogram_score_gufunc,
-    _vrvariogram_score_gufunc,
-)
+try:
+    from ._gufuncs import (
+        _owvariogram_score_gufunc,
+        _variogram_score_gufunc,
+        _vrvariogram_score_gufunc,
+    )
+except ImportError:
+    _owvariogram_score_gufunc = None
+    _variogram_score_gufunc = None
+    _vrvariogram_score_gufunc = None
+
 from ._score import owvariogram_score as owvs
 from ._score import variogram_score as vs
 from ._score import vrvariogram_score as vrvs