code: def sparse_to_dense(x, default_value=None):
      x_shape = x.shape
      x = tf.sparse.to_dense(x, default_value=default_value)
      x.set_shape(x_shape)
      return x
  
file_path: keras/keras/backend/tensorflow/sparse.py
imports: import functools
  import tensorflow
label_desc: Use image node_id 2 for calling a global function with example usage: sparse_to_dense(x, default_value) and returns: x