class_docstr: Reads in a file that has at least two columns: a label and a sentence.
  This reader can for example be used with the BatchHardTripletLoss.
  Maps labels automatically to integers
class_docstr_tok: ["Reads","in","a","file","that","has","at","least","two","columns",":","a","label","and","a","sentence",".","This","reader","can","for","example","be","used","with","the","BatchHardTripletLoss",".","Maps","labels","automatically","to","integers"]
code: def __init__(
      self, folder, label_col_idx=0, sentence_col_idx=1, separator="\t"
  ):
      self.folder = folder
      self.label_map = {}
      self.label_col_idx = label_col_idx
      self.sentence_col_idx = sentence_col_idx
      self.separator = separator
  
imports: from .None import InputExample
  import os
label_desc: Use image node_id 1 to create a new LabelSentenceReader object  with example: obj = LabelSentenceReader(folder, label_col_idx, sentence_col_idx, separator)