message: Added documentation for tf.lookup.TextFileIndex
diff: @@ -421,6 +421,18 @@ class KeyValueTensorInitializer(TableInitializerBase):
  @tf_export("lookup.TextFileIndex")
  class TextFileIndex(object):
  + """The key and value content to get from each line.
  +
  + The key and value content to get from each line is specified either
  + by the following, or a value `>=0`.
  + * `TextFileIndex.LINE_NUMBER` means use the line number starting from zero,
  + expects data type int64.
  + * `TextFileIndex.WHOLE_LINE` means use the whole line content, expects data
  + type string.
  +
  + A value `>=0` means use the index (starting at zero) of the split line based
  + on `delimiter`.
  + """
  WHOLE_LINE = -2
  LINE_NUMBER = -1
  