code: def apply(self, chart, grammar):
      for index in range(chart.num_leaves()):
          new_edge = ProbabilisticLeafEdge(chart.leaf(index), index)
          if chart.insert(new_edge, ()):
              yield new_edge
  
imports: import random
  from functools import reduce
  from nltk.grammar import PCFG, Nonterminal
  from nltk.parse.api import ParserI
  from nltk.parse.chart import AbstractChartRule, Chart, LeafEdge, TreeEdge
  from nltk.tree import ProbabilisticTree, Tree
label_desc: Use image node_id 1 for calling the ProbabilisticBottomUpInitRule obj's underlying member method code with example usage: obj.apply(chart, grammar) without return types