Fix compile when no args are provided (#305)

tripy/tests/backend/api/test_compile.py

@@ -79,6 +79,12 @@ def test_invalid_return_rejected(self, func):
         with helper.raises(tp.TripyException, "Function must return 1 or more Tensors"):
             tp.compile(func, args=[tp.InputInfo((2, 2), dtype=tp.float32)])
 
+    def test_no_input_network(self):
+        def accepts_nothing():
+            return tp.Tensor([1])
+
+        tp.compile(accepts_nothing, args=[])
+
     def test_multiple_return_values(self):
         compiled_func = tp.compile(
             returns_multiple_tensors,

tripy/tripy/utils/utils.py

@@ -436,16 +436,18 @@ def get_positional_arg_names(func, *args):
     # None instead.
     signature = inspect.signature(func)
     arg_names = []
+    varargs_name = None
     for name, param in signature.parameters.items():
         if param.kind == inspect.Parameter.VAR_POSITIONAL:
             # Positional arguments cannot follow variadic positional arguments
             # (they would just be absorbed into the variadic argument).
+            varargs_name = name
             break
 
         arg_names.append(name)
 
     # For all variadic positional arguments, assign the name of the variadic group.
-    arg_names.extend([name] * (len(args) - len(arg_names)))
+    arg_names.extend([varargs_name] * (len(args) - len(arg_names)))
     return list(zip(arg_names, args))