remove `torch.cuda.is_available()` check when compiling ops (#3085)

Co-authored-by: NOlatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: NLogan Adams <114770087+loadams@users.noreply.github.com>
Co-authored-by: NJeff Rasley <jerasley@microsoft.com>

op_builder/builder.py

@@ -36,9 +36,6 @@ else:
 
 
 def installed_cuda_version(name=""):
-    import torch.cuda
-    if not torch.cuda.is_available():
-        return 0, 0
     import torch.utils.cpp_extension
     cuda_home = torch.utils.cpp_extension.CUDA_HOME
     assert cuda_home is not None, "CUDA_HOME does not exist, unable to compile CUDA op(s)"
@@ -78,8 +75,6 @@ cuda_minor_mismatch_ok = {
 
 def assert_no_cuda_mismatch(name=""):
     cuda_major, cuda_minor = installed_cuda_version(name)
-    if cuda_minor == 0 and cuda_major == 0:
-        return False
     sys_cuda_version = f'{cuda_major}.{cuda_minor}'
     torch_cuda_version = ".".join(torch.version.cuda.split('.')[:2])
     # This is a show-stopping error, should probably not proceed past this
@@ -344,10 +339,11 @@ class OpBuilder(ABC):
 
     def is_cuda_enable(self):
         try:
-            if torch.cuda.is_available():
-                return '-D__ENABLE_CUDA__'
-        except:
-            print(f"{WARNING} {self.name} torch.cuda is missing, only cpu ops can be compiled!")
+            assert_no_cuda_mismatch(self.name)
+            return '-D__ENABLE_CUDA__'
+        except BaseException:
+            print(f"{WARNING} {self.name} cuda is missing or is incompatible with installed torch, "
+                  "only cpu ops can be compiled!")
             return '-D__DISABLE_CUDA__'
         return '-D__DISABLE_CUDA__'
 
@@ -459,7 +455,11 @@ class OpBuilder(ABC):
             raise RuntimeError(f"Unable to JIT load the {self.name} op due to ninja not being installed.")
 
         if isinstance(self, CUDAOpBuilder) and not self.is_rocm_pytorch():
-            self.build_for_cpu = not assert_no_cuda_mismatch(self.name)
+            try:
+                assert_no_cuda_mismatch(self.name)
+                self.build_for_cpu = False
+            except BaseException:
+                self.build_for_cpu = True
 
         self.jit_mode = True
         from torch.utils.cpp_extension import load
@@ -579,7 +579,12 @@ class CUDAOpBuilder(OpBuilder):
         return super().is_compatible(verbose)
 
     def builder(self):
-        self.build_for_cpu = not assert_no_cuda_mismatch(self.name)
+        try:
+            assert_no_cuda_mismatch(self.name)
+            self.build_for_cpu = False
+        except BaseException:
+            self.build_for_cpu = True
+
         if self.build_for_cpu:
             from torch.utils.cpp_extension import CppExtension as ExtensionBuilder
         else: