tensorflow graph node names dont match operation names

Question

I am a newer for tensorflow, and I am confused with the graph struction in tensorflow tutorial label_image . Using the code blew:

import tensorflow as tf
with tf.Session() as sess:
    with open('/var/tmp/feng/tensorflow/tensorflow/examples/label_image/data/inception_v3_2016_08_28_frozen.pb', 'rb') as f:
        graph_def = tf.GraphDef()
        graph_def.ParseFromString(f.read())

        print graph_def

I can see the graph struction as this

...
...
node {
  name: "InceptionV3/Predictions/Reshape_1"
  op: "Reshape"
  input: "InceptionV3/Predictions/Softmax"
  input: "InceptionV3/Predictions/Shape"
  attr {
    key: "T"
    value {
      type: DT_FLOAT
    }
  }
  attr {
    key: "Tshape"
    value {
      type: DT_INT32
    }
  }
}

It's OK. I can see the last node name is "InceptionV3/Predictions/Reshape_1",however, when I use code blew to show all operations

the operation in this graph
    with tf.Session(graph=graph) as sess:
        # results = sess.run(output_tensor, {
        #     input_tensor: t
        # })
        print(sess.graph.get_operations())

It shows me like this

 <tf.Operation 'import/InceptionV3/Predictions/Softmax' type=Softmax>,
 <tf.Operation 'import/InceptionV3/Predictions/Shape' type=Const>, 
 <tf.Operation 'import/InceptionV3/Predictions/Reshape_1' type=Reshape>

why the operation name add import before the node name.It's strange because the string import never appears in the graph of this model.I google it but everyone says the function

get_operation_by_name

return an instance of type tf.Operation,which is a node in the computational graph, so the difference between operation name and node name is confused. Can anyone help me ?

Answer 1

Most probably, you imported the graph using import_graph_def or some higher-level function that ends up calling import_graph_def. Here is a copy of documentation for its name argument:

name: (Optional.) A prefix that will be prepended to the names in 
      graph_def. Note that this does not apply to imported function 
      names. Defaults to "import".

If you don't want any prefix added, invoke it with name=''