title: How to use K.get_session in Tensorflow 2.0 or how to migrate it?
body: <pre><code>def __init__(self, **kwargs):
      self.__dict__.update(self._defaults) # set up default values
      self.__dict__.update(kwargs) # and update with user overrides
      self.class_names = self._get_class()
      self.anchors = self._get_anchors()
      self.sess = K.get_session()
  </code></pre>
  
  <p>RuntimeError: <code>get_session</code> is not available when using TensorFlow 2.0.</p>