Add memo option, automatic inputs, and copy options to FunctionGraph

tests/graph/test_fg.py

@@ -41,6 +41,10 @@ class TestFunctionGraph:
             var3 = op1(var1)
             FunctionGraph([var3], [var2], clone=False)
 
+        with pytest.raises(ValueError):
+            var3 = op1(var1)
+            FunctionGraph([var3], clone=False)
+
     def test_init(self):
         var1 = MyVariable("var1")
         var2 = MyVariable("var2")
@@ -58,6 +62,19 @@ class TestFunctionGraph:
         assert fg.get_clients(var3) == [(var4.owner, 0), ("output", 0)]
         assert fg.get_clients(var4) == [("output", 1)]
 
+        fg = FunctionGraph(outputs=[var3, var4], clone=False)
+        assert fg.inputs == [var1, var2]
+
+        memo = {}
+        fg = FunctionGraph(outputs=[var3, var4], clone=True, memo=memo)
+
+        assert memo[var1].type == var1.type
+        assert memo[var1].name == var1.name
+        assert memo[var2].type == var2.type
+        assert memo[var2].name == var2.name
+        assert var3 in memo
+        assert var4 in memo
+
     def test_remove_client(self):
         var1 = MyVariable("var1")
         var2 = MyVariable("var2")

tests/graph/utils.py

@@ -58,7 +58,7 @@ class MyOp(Op):
         return Apply(self, inputs, outputs)
 
     def perform(self, node, inputs, outputs):
-        outputs[0] = np.array(inputs)
+        outputs[0] = np.array(inputs, dtype=np.object)
 
     def __str__(self):
         return self.name