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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_node(name):
 	""" 	returns HTOp or tf graph element corresponding to requested node name 	"""

	if name in _ops:
		return _ops[name]
	else:
		g=tf.get_default_graph()
		return g.as_graph_element(name)