Fea/nn graph/graph name

[strint]

根据子类实例化顺序递增为Graph/Job创建ID：

class A(nn.Graph)

class B(nn.Graph)

class CB(B)


x = A()  
x.name # A_0
x = A()
x.name # A_1
x = B()
x.name # B_0
x = B()
x.name # B_1
x = CB()
x.name # CB_0