Attempting to use uninitialized value x

[Oceania2018]

        [TestMethod]
        public void Add()
        {
            var x = tf.Variable(10, name: "x");

            var model = tf.global_variables_initializer();

            using (var session = tf.Session())
            {
                var sm = session.run(model);
                for(int i = 0; i < 5; i++)
                {
                    var x1 = x + 1;
                    var result = session.run(x1);
                    print(result);
                }
            }
        }

The unit test above throws exception:
Attempting to use uninitialized value x [[{{node x/read}}]]

[Esther2013]

Check the doc https://www.tensorflow.org/guide/variables Initializing variable

[Oceania2018]

I've added another test VariableTest, it works. continue to investigate.

        public void Initializer()
        {
            var x = tf.Variable(10, name: "x");
            
            using (var session = tf.Session())
            {
                session.run(x.initializer);
                var result = session.run(x);
                Assert.AreEqual(10, (int)result);
            }
        }

[Deep-Blue-2013]

The Add is passing a Tensor, Initializer is passing a RefVariable.

[Oceania2018]

When I add session.run(x1), the result got the expected value, so there must be tf.global_variables_initializer() and session.run(model) didn't initialize the variable.

[Oceania2018]

Or another assumption is that the model isn't referenced to the right x.initializer.
The root cause is we didn't do an Assign operation before the variable is used.
We have to make sure model contains control_inputs.

[Oceania2018]

Create a new issue #141 to do control_inputs.