docstr: Update the swarm's velocity-matrix
code: def compute_velocity(self, swarm):
      """Update the swarm's velocity-matrix"""
      raise NotImplementedError("Topology::compute_velocity()")
  
file_path: pyswarms/pyswarms/backend/topology/base.py
imports: import abc
  import logging
  from ...utils.reporter import Reporter
label_desc: Use image node_id 4 for calling the Topology obj's underlying member method code with example usage: obj.compute_velocity(swarm) without return types