docstr: Send the message to the Perspective server implementation - must be
  implemented by a child class.
docstr_tok: ["Send","the","message","to","the","Perspective","server","implementation","-","must","be","implemented","by","a","child","class","."]
code: def send(self, msg):
      """Send the message to the Perspective server implementation - must be
      implemented by a child class."""
      raise NotImplementedError()
  
file_path: perspective/python/perspective/perspective/client/base.py
imports: import asyncio
  from random import random
  from ..core.exception import PerspectiveError
  from .table_api import PerspectiveTableProxy
  from .table_api import table
  from .view_api import PerspectiveViewProxy
label_desc: Use image node_id 4 for calling the PerspectiveClient obj's underlying member method code with example usage: obj.send(msg) without return types