We have constructed the graph of our linear model, and we can supply data into it. If we were to create a session and run the model_out Tensor in it while supplying some input data, then we would get a result produced. However, the output we would get would be complete rubbish. Our model has yet to be trained! The values of our weights and biases just have the default values given to them when we initialized our variables using the initializer node.