added filter to floordiv to only enable for pytorch 1.6+ (#511)

* added filter to floordiv to only enable for pytorch 1.6+

* enabled soft failure for missing torch method

Author: jaybdub

torch2trt/torch2trt.py

@@ -19,6 +19,10 @@ def trt_version():
     return trt.__version__
 
 
+def torch_version():
+    return torch.__version__
+
+
 def torch_dtype_to_trt(dtype):
     if trt_version() >= '7.0' and dtype == torch.bool:
         return trt.bool
@@ -593,7 +597,10 @@ def tensorrt_converter(method, is_real=True, enabled=True, imports=[]):
     else:
         module, module_name, qual_name = importlib.import_module(method.__module__), method.__module__, method.__qualname__
 
-    method_impl = eval('copy.deepcopy(module.%s)' % qual_name)
+    try:
+        method_impl = eval('copy.deepcopy(module.%s)' % qual_name)
+    except:
+        enabled = False
 
     def register_converter(converter):
         CONVERTERS[method] = {
@@ -615,4 +622,4 @@ def pass_converter(converter):
     else:
         return pass_converter
 
-    return register_converter
+    return register_converter