def test_replace(self):
var1 = MyVariable("var1")
var2 = MyVariable("var2")
var3 = op1(var2, var1)
var4 = op2(var3, var2)
var5 = op3(var4, var2, var2)
fg = FunctionGraph([var1, var2], [var3, var5], clone=False)
with pytest.raises(Exception, match="Cannot replace.*"):
var4.fgraph = object()
# Trigger a `FunctionGraph` ownership error
fg.replace(var4, var1, verbose=True)
var4.fgraph = fg
with pytest.raises(BadOptimization):
var0 = MyVariable2("var0")
# The types don't match and one cannot be converted to the other
fg.replace(var3, var0)
# Test a basic replacement
fg.replace_all([(var3, var1)])
assert var3 not in fg.variables
assert fg.apply_nodes == {var4.owner, var5.owner}
assert var4.owner.inputs == [var1, var2]
def test_replace_circular(self):
"""`FunctionGraph` allows cycles--for better or worse."""
var1 = MyVariable("var1")
var2 = MyVariable("var2")
var3 = op1(var2, var1)
var4 = op2(var3, var2)
var5 = op3(var4, var2, var2)
fg = FunctionGraph([var1, var2], [var3, var5], clone=False)
fg.replace_all([(var3, var4)])
# The following works (and is kind of gross), because `var4` has been
# mutated in-place
assert fg.apply_nodes == {var4.owner, var5.owner}
assert var4.owner.inputs == [var4, var2]
