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попытка изменить форму тензорного слоя dense1 с (None, 13) (None, 1, 13) фрагмента кода на фрагмент кода

 dense1= Dense(13, activation='relu')
tf.expand_dims(dense1, axis=1)
 

И это ошибка

 ---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-3-82c32af7a088> in <module>()
----> 1 tf.expand_dims(dense1, axis=1)

10 frames
/usr/local/lib/python3.6/dist-packages/tensorflow/python/framework/constant_op.py in convert_to_eager_tensor(value, ctx, dtype)
     96       dtype = dtypes.as_dtype(dtype).as_datatype_enum
     97   ctx.ensure_initialized()
---> 98   return ops.EagerTensor(value, ctx.device_name, dtype)
     99 
    100 

ValueError: Attempt to convert a value (<tensorflow.python.keras.layers.core.Dense object at 0x7f58f41d9b00>) with an unsupported type (<class 'tensorflow.python.keras.layers.core.Dense'>) to a Tensor.
 

Попробуйте обернуть его в TimeDistributed слой:

 import tensorflow as tf

model = tf.keras.Sequential([
    tf.keras.layers.TimeDistributed(tf.keras.layers.Dense(13, activation='relu'),  
        input_shape=[1, 13])])

model.build(input_shape=[13])
model.summary()
 

 _________________________________________________________________
Layer (type)                 Output Shape              Param #   
=================================================================
time_distributed_3 (TimeDist (None, 1, 13)             182       
=================================================================
Total params: 182
Trainable params: 182
Non-trainable params: 0
_________________________________________________________________