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Edge isoperimetric number

This is probably a very silly question. How does one get the edge isoperimetric number of a graph?

As seen under this link [which I cannot put correctly due to low karma] trac.sagemath.org/ticket/21942 there should be an algorithm for it, but when I define a graph (say H), then

 edge_isoperimetric_number(H) 

returns "name 'edge_isoperimetric_number' is not defined"

and

 H.edge_isoperimetric_number() 

returns "'Graph' object has no attribute 'edge_isoperimetric_number'"

(while

 edge_isoperimetric_number? 

returns "Object edge_isoperimetric_number not found."

So how do I load said algorithm for use?

Edge isoperimetric number

This is probably a very silly question. How does one get the edge isoperimetric number of a graph?

As seen under this link [which I cannot put correctly due to low karma] trac.sagemath.org/ticket/21942 here there should be an algorithm for it, but when I define a graph (say H), then

 edge_isoperimetric_number(H) 

returns "name 'edge_isoperimetric_number' is not defined"

and

 H.edge_isoperimetric_number() 

returns "'Graph' object has no attribute 'edge_isoperimetric_number'"

(while

 edge_isoperimetric_number? 

returns "Object edge_isoperimetric_number not found."

So how do I load said algorithm for use?