class_docstr: Poisson exponential family.
  
  INPUTS:
     link      -- a Link instance
class_docstr_tok: ["Poisson","exponential","family",".","INPUTS",":","link","--","a","Link","instance"]
code: def __init__(self, link=L.log):
      self.variance = Poisson.variance
      self.link = link
  
imports: import numpy
  from .None import links
  from .None import varfuncs
label_desc: Use image node_id 1 to create a new Poisson object from inherited base classes: Family with example: obj = Poisson(link)