tensorflow: model.save() returning a 'NotImplementedError'

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System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): Yes
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Windows 10 1803
• Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device:
• TensorFlow installed from (source or binary): From pip
• TensorFlow version (use command below): 1.11.0
• Python version: 3.6.6
• Bazel version (if compiling from source):
• GCC/Compiler version (if compiling from source):
• CUDA/cuDNN version:
• GPU model and memory:
• Exact command to reproduce:

model = tf.keras.models.Sequential()
model.add(tf.keras.layers.Flatten())
model.add(tf.keras.layers.Dense(128, activation=tf.nn.relu))
model.add(tf.keras.layers.Dense(128, activation=tf.nn.relu))
model.add(tf.keras.layers.Dense(10, activation=tf.nn.softmax))

model.compile(optimizer='adam', loss='sparse_categorical_crossentropy', metrics=['accuracy'])

model.fit(x_train, y_train, epochs=3)

model.save('epic_num_reader.model')

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https://github.com/tensorflow/tensorflow/tree/master/tools/tf_env_collect.sh

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python -c “import tensorflow as tf; print(tf.GIT_VERSION, tf.VERSION)”

Describe the problem

I’m receiving a NotImplementedError when trying to save a new model. The code above written above creates the error. This code is from a tutorial i’ve been following here Python Programming (Sentdex).

It’s on a fresh machine with a fresh install of python and tensorflow.

Talking with some others on a Discord chat, i’m not the first person who’s encountered this recently.

Source code / logs

Include any logs or source code that would be helpful to diagnose the problem. If including tracebacks, please include the full traceback. Large logs and files should be attached. Try to provide a reproducible test case that is the bare minimum necessary to generate the problem.

---------------------------------------------------------------------------
NotImplementedError                       Traceback (most recent call last)
<ipython-input-11-7b7b789f82a6> in <module>
----> 1 model.save('epic_num_reader.model')

c:\users\james\appdata\local\programs\python\python36\lib\site-packages\tensorflow\python\keras\engine\network.py in save(self, filepath, overwrite, include_optimizer)
   1356     """
   1357     if not self._is_graph_network:
-> 1358       raise NotImplementedError
   1359 
   1360     from tensorflow.python.keras.models import save_model  # pylint: disable=g-import-not-at-top

NotImplementedError: