调用TensorFlowInferenceInterface接口，fetch到矩阵减法结果是错的

输出pb文件

 # -*- coding:utf-8 -*-
import tensorflow as tf

session = tf.Session()

matrix1 = tf.constant([[1., 3.]], name='input1')
matrix2 = tf.constant([[2., 2.]], name='input2')
mat_add = tf.add(matrix1, matrix2, name='output1')
mat_sub = tf.subtract(matrix1, matrix2, name='output2')

session.run(mat_add)
session.run(mat_sub)


tf.train.write_graph(session.graph.as_graph_def(), "./models/", "simple.pb", as_text=False)

session.close()

Android端调用TensorFlowInferenceInterface接口的主要代码

 inferenceInterface = new TensorFlowInferenceInterface(getAssets(),MODEL_FILE);

input1[0] = (float) 5.0; input1[1] = (float) 6.0;
input2[0] = (float) 2.0; input2[1] = (float) 3.0;


inferenceInterface.feed("input1", input1, new long[]{1,2});
inferenceInterface.feed("input2", input2, new long[]{1,2});

inferenceInterface.run(new String[]{"output1","output2"});

inferenceInterface.fetch("output1", output1);
inferenceInterface.fetch("output2", output2);


for(float f : output1)
    Log.i(TAG, "output1: " + f);
for(float f : output2)
    Log.i(TAG, "output2: " + f);

结果如下图
加法的结果一直是正确的，但减法的结果一直是[1.0, 1.0]。求大神告知原因啊！

http://blog.csdn.net/uyerp/article/details/70045614