title: What are symbolic tensors in TensorFlow and Keras?
body: <p>What are <em>symbolic tensors</em> in TensorFlow and Keras? How are they different than other tensors? Why do they even exist? Where do they come up in TensorFlow and Keras? How should we deal with them or what problems can we face when dealing with them?</p>
  
  <p>In the past, I had faced certain issues related to symbolic tensors, such as the <code>_SymbolicException</code>, but the documentation does not describe this concept. There's also <a href="https://stackoverflow.com/q/57417690/3924118">another post</a> where this question is also asked, but, in this post, I am focusing on this specific question, so that answers can be later used as a reference.</p>