code: def get_all_trainable_variable():
      """get_all_variables.
  
      Get all Graph trainable variables.
  
      Returns:
          A list of Variables.
  
      """
      return tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES)
  
file_path: tflearn/tflearn/variables.py
imports: from __future__ import division, print_function, absolute_import
  import tensorflow.compat.v1
  import tflearn
  from tflearn.vendor.arg_scope import add_arg_scope
label_desc: Use image node_id 3 for calling a global function with example usage: get_all_trainable_variable() and returns: tf