code: def distance_matrix(trains1, trains2, cos, tau):
      
      return dissimilarity_matrix(trains1, trains2, cos, tau, "distance")
docs: Return the *bipartite* (rectangular) distance matrix between the observations in the first and the second list.
  
      Convenience function; equivalent to ``dissimilarity_matrix(trains1, trains2, cos, tau, "distance")``. Refer to :func:`pymuvr.dissimilarity_matrix` for full documentation.