code: def load(self, filename):
          
          dir_name = os.path.dirname(filename)
          mod_name = os.path.basename(filename).split('.')[0]
          self.filename = mod_name
          sys.path.insert(0, dir_name)
          mod = __import__(mod_name)
          sys.path.remove(dir_name) # do not pollute the path.
          pipers, xtras, pipes = mod.pipeline()
          self.add_pipers(pipers, xtras)
          self.add_pipes(pipes)
docs: Instanciates (loads) pipeline from a source code file.
          
          Arguments:
          
            - filename(``path``) location of the pipeline source code.