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This image shows the following partial lines of code: 

Line 1:import org.apache.spark.sql.functions.col

Line 2: /* 
 
Line 3: * Class representing a graph edge - a connection between two users. 
 
Line 4: * Each record in the CSV file corresponds to an instance of this class.
 
Line 5: */
Line 6: 
case class Edge(
    
Line 7: idStart: Integer,
    
Line 8: idEnd: Integer

Line 9: )
Line 10: 
Line 11: 

/* Parse the CSV file into a DataFrame consisting of instances of the Edge class */
Line 12: 
val edges = graphText
.    
Line 13: map(s => s.split(","))
.    
Line 14: filter(s => s.size == 2).