TypeError: Unable to serialize [2.0896919 2.1128857 2.1081853] to JSON. Unrecognized type <class 'tensorflow.python.framework.ops.EagerTensor'>.

tensorflow.log

# see https://github.com/keras-team/keras/pull/17498
# tf.__version__
# '2.11.0'

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 1152, 320), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400bcee0>, 140389004273456), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 1152, 320), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400bcee0>, 140389004273456), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 320, 1280), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400e7460>, 140389004548640), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 320, 1280), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400e7460>, 140389004548640), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1280, 101), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad401393f0>, 140389288787632), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1280, 101), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad401393f0>, 140389288787632), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(101,), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad4013b3a0>, 140388893401136), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(101,), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad4013b3a0>, 140388893401136), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 1152, 320), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400bcee0>, 140389004273456), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 1152, 320), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400bcee0>, 140389004273456), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 320, 1280), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400e7460>, 140389004548640), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1, 1, 320, 1280), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad400e7460>, 140389004548640), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1280, 101), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad401393f0>, 140389288787632), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(1280, 101), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad401393f0>, 140389288787632), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(101,), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad4013b3a0>, 140388893401136), {}).

INFO:tensorflow:Unsupported signature for serialization: ((TensorSpec(shape=(101,), dtype=tf.float32, name='gradient'), <tensorflow.python.framework.func_graph.UnknownArgument object at 0x7fad4013b3a0>, 140388893401136), {}).
WARNING:absl:Found untraced functions such as _jit_compiled_convolution_op, _jit_compiled_convolution_op, _jit_compiled_convolution_op, _jit_compiled_convolution_op, _jit_compiled_convolution_op while saving (showing 5 of 81). These functions will not be directly callable after loading.

INFO:tensorflow:Assets written to: ../saved_models/food101_env2m_30epochs/assets

INFO:tensorflow:Assets written to: ../saved_models/food101_env2m_30epochs/assets

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[64], line 2
      1 # save the full model
----> 2 model.save('../saved_models/food101_env2m_30epochs')

File /usr/lib/python3.10/site-packages/keras/utils/traceback_utils.py:70, in filter_traceback.<locals>.error_handler(*args, **kwargs)
     67     filtered_tb = _process_traceback_frames(e.__traceback__)
     68     # To get the full stack trace, call:
     69     # `tf.debugging.disable_traceback_filtering()`
---> 70     raise e.with_traceback(filtered_tb) from None
     71 finally:
     72     del filtered_tb

File /usr/lib/python3.10/json/encoder.py:199, in JSONEncoder.encode(self, o)
    195         return encode_basestring(o)
    196 # This doesn't pass the iterator directly to ''.join() because the
    197 # exceptions aren't as detailed.  The list call should be roughly
    198 # equivalent to the PySequence_Fast that ''.join() would do.
--> 199 chunks = self.iterencode(o, _one_shot=True)
    200 if not isinstance(chunks, (list, tuple)):
    201     chunks = list(chunks)

File /usr/lib/python3.10/json/encoder.py:257, in JSONEncoder.iterencode(self, o, _one_shot)
    252 else:
    253     _iterencode = _make_iterencode(
    254         markers, self.default, _encoder, self.indent, floatstr,
    255         self.key_separator, self.item_separator, self.sort_keys,
    256         self.skipkeys, _one_shot)
--> 257 return _iterencode(o, 0)

TypeError: Unable to serialize [2.0896919 2.1128857 2.1081853] to JSON. Unrecognized type <class 'tensorflow.python.framework.ops.EagerTensor'>.