code: def euclidean_distance(x, y):
      return K.sqrt(
          K.maximum(
              K.sum(K.square(x - y), axis=-1, keepdims=True),
              K.epsilon(),
          )
      )
  
imports: import tensorflow
  from tensorflow.keras import backend
label_desc: Use image node_id 1 for calling a global function with example usage: euclidean_distance(x, y) and returns: K