How does this work? When you create a model variable via TF-Slim's layers or
directly via the `slim.model_variable` function, TF-Slim adds the variable to
-a the `tf.GraphKeys.MODEL_VARIABLES` collection. What if you have your own
+the `tf.GraphKeys.MODEL_VARIABLES` collection. What if you have your own
custom layers or variable creation routine but still want TF-Slim to manage or
be aware of your model variables? TF-Slim provides a convenience function for
adding the model variable to its collection: