TF-lite 模型测试失败并出现运行时错误

我已经为 MNIST 分类创建了一个 TF-lite 模型（我使用 TF 1.12.0 并在 Google Colab 上运行它），我想使用 TensorFlow Lite Python 解释器对其进行测试，如

https://github.com/freedomtan/tensorflow/blob/deeplab_tflite_python/tensorflow/contrib/lite/examples/python/label_image.py https://github.com/freedomtan/tensorflow/blob/deeplab_tflite_python/tensorflow/contrib/lite/examples/python/label_image.py

但是当我尝试调用解释器时出现此错误 -

RuntimeError                              Traceback (most recent call last)
<ipython-input-138-7d35ed1dfe14> in <module>()
----> 1 interpreter.invoke()

/usr/local/lib/python3.6/dist- 
packages/tensorflow/contrib/lite/python/interpreter.py in invoke(self)
251       ValueError: When the underlying interpreter fails raise 
ValueError.
252     """
--> 253     self._ensure_safe()
254     self._interpreter.Invoke()
255 

/usr/local/lib/python3.6/dist- 
packages/tensorflow/contrib/lite/python/interpreter.py in 
_ensure_safe(self)
 97       in the interpreter in the form of a numpy array or slice. Be sure 
 to
 98       only hold the function returned from tensor() if you are using 
 raw
 ---> 99       data access.""")

101   def _get_tensor_details(self, tensor_index):

 RuntimeError: There is at least 1 reference to internal data
  in the interpreter in the form of a numpy array or slice. Be sure to
  only hold the function returned from tensor() if you are using raw
  data access.

这是代码 -

import numpy as np

# Load TFLite model and allocate tensors.
interpreter = 
tf.contrib.lite.Interpreter(model_path="mnist/mnist_custom.tflite")
interpreter.allocate_tensors()

# Get input and output tensors.
input_details = interpreter.get_input_details()
output_details = interpreter.get_output_details()
input_details

[{'dtype': numpy.float32, “索引”：3， '名称'：'conv2d_1_input'， “量化”：（0.0，0）， '形状': array([ 1, 28, 28, 1], dtype=int32)}]

test_images[0].shape

(28, 28, 1)

input_data = np.expand_dims(test_images[0], axis=0)
input_data.shape

(1, 28, 28, 1)

interpreter.set_tensor(input_details[0]['index'], input_data)
interpreter.invoke()

问题是我不明白这条消息的含义以及该怎么办。

tf.convert_to_tensor and interpreter.set_tensor为我做了这份工作

tensor_index = interpreter.get_input_details()[0]['index']
input_tensor_z= tf.convert_to_tensor(z, np.float32)
interpreter.set_tensor(tensor_index, input_tensor_z)

我创建了一个端到端示例，从训练 Keras 模型开始在 TensorFlow Lite 上提供服务here https://github.com/romeokienzler/TensorFlow/blob/master/notebooks/tf2savedModel.ipynb

我也在中发布了相同的答案this https://stackoverflow.com/questions/56777704/how-to-fix-there-is-at-least-1-reference-to-internal-data-in-the-interpreter-in/60403076#60403076 thread