code: def read_block(self, stream):
      block = []
      for para_str in self._para_block_reader(stream):
          para = []
          for sent_str in self._sent_tokenizer.tokenize(para_str):
              sent = self._str2chunktree(
                  sent_str,
                  source_tagset=self._source_tagset,
                  target_tagset=self._target_tagset,
              )
  
              # If requested, throw away the tags.
              if not self._tagged:
                  sent = self._untag(sent)
  
              # If requested, throw away the chunks.
              if not self._chunked:
                  sent = sent.leaves()
  
              # Add the sentence to `para`.
              if self._group_by_sent:
                  para.append(sent)
              else:
                  para.extend(sent)
  
          # Add the paragraph to `block`.
          if self._group_by_para:
              block.append(para)
          else:
              block.extend(para)
  
      # Return the block
      return block
  
imports: import codecs
  import os.path
  import nltk
  from nltk.chunk import tagstr2tree
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.bracket_parse import BracketParseCorpusReader
  from nltk.corpus.reader.util import *
  from nltk.tokenize import *
  from nltk.tree import Tree
label_desc: Use image node_id 2 for calling the ChunkedCorpusView obj's underlying member method code with example usage: obj.read_block(stream) and returns: block