text: #!/usr/bin/env python
  
  """
  Parses console arguments.
  """
  import sys
  import argparse
  import uuid
  import logging
  from abc import ABCMeta
  
  class BaseSettings(object):
      """
      All modes (abstract base class)
      """
      __metaclass__ = ABCMeta
  
      def __init__(self, from_console_arguments=False):
          self._from_console_arguments = from_console_arguments
          self._parser = argparse.ArgumentParser()
          self._add_console_arguments()
          self._set_console_arguments()
          self._set_additional_vars()
  
      def _add_console_arguments(self):
          """
          Console arguments used in all modes
          """
          self._parser.add_argument('--models', '-m', type=str, nargs = '+', required=True, metavar="MODEL",
                                    help="model to use. Provide multiple models (with same vocabulary) for ensemble decoding")
          self._parser.add_argument('-p', dest='num_processes', type=int, default=1,
                                    help="Number of processes (default: %(default)s))")
          self._parser.add_argument('-v', dest='verbose', action="store_true", help="verbose mode.")
  
      def _set_console_arguments(self):
          """
          Parses console arguments and loads them into the namespace of this
          object.
  
          If there are no console arguments, the argument parser's default values
          (see `self._parse_shared_console_arguments` and
          `self._parse_individual_console_arguments`) are used.
          """
          if self._from_console_arguments:
              args = vars(self._parser.parse_args())
          else:
              args = {a.dest: self._parser.get_default(a.dest) for a in self._parser._actions}
          for key, value in args.iteritems():
              setattr(self, key, value)
  
      def _set_additional_vars(self):
          """
          Adds additional variables/constants to this object. They can be derived
          or independent from parsed console arguments.
          """
          pass # override in subclass
  
  
  class TranslationSettings(BaseSettings):
      """
      Console interface for file translation mode
      """
  
      def _add_console_arguments(self):
          super(TranslationSettings, self)._add_console_arguments()
  
          self._parser.add_argument('-k', dest='beam_width', type=int, default=5,
                                    help="Beam size (default: %(default)s))")
          self._parser.add_argument('-n', dest='normalization_alpha', type=float, default=0.0, nargs="?", const=1.0, metavar="ALPHA",
                                    help="Normalize scores by sentence length (with argument, exponentiate lengths by ALPHA)")
          self._parser.add_argument('-c', dest='char_level', action="store_true", help="Character-level")
  
          if self._from_console_arguments: # don't open files if no console arguments are parsed
              self._parser.add_argument('--input', '-i', type=argparse.FileType('r'),
                                        default=sys.stdin, metavar='PATH',
                                        help="Input file (default: standard input)")
              self._parser.add_argument('--output', '-o', type=argparse.FileType('w'),
                                        default=sys.stdout, metavar='PATH',
                                        help="Output file (default: standard output)")
  
          self._parser.add_argument('--n-best', action="store_true",
                                    help="Write n-best list (of size k)")
  
      def _set_additional_vars(self):
          self.request_id = uuid.uuid4()
  
  class ServerSettings(BaseSettings):
      """
      Console interface for server mode
  
      Most parameters required in default mode are provided with each translation
      request to the server (see `nematus/server/request.py`).
      """
  
      def _add_console_arguments(self):
          super(ServerSettings, self)._add_console_arguments()
          self._parser.add_argument('--style', default='Nematus',
                                    help='API style; see `README.md` (default: Nematus)')
          self._parser.add_argument('--host', default='0.0.0.0',
                                    help='Host address (default: 0.0.0.0)')
          self._parser.add_argument('--port', type=int, default=8080,
                                    help='Host port (default: 8080)')
          self._parser.add_argument('--threads', type=int, default=4,
                                    help='Number of threads (default: 4)')
  
  
  class ScorerBaseSettings(BaseSettings):
      """
      Base class for scorer and rescorer settings
      """
      __metaclass__ = ABCMeta
  
      def _add_console_arguments(self):
          super(ScorerBaseSettings, self)._add_console_arguments()
          self._parser.add_argument('-b', type=int, default=80,
                                    help="Minibatch size (default: %(default)s))")
          self._parser.add_argument('-n', dest='normalization_alpha', type=float, default=0.0, nargs="?", const=1.0, metavar="ALPHA",
                                    help="Normalize scores by sentence length (with argument, exponentiate lengths by ALPHA)")
          if self._from_console_arguments: # don't open files if no console arguments are parsed
              self._parser.add_argument('--output', '-o', type=argparse.FileType('w'),
                                        default=sys.stdout, metavar='PATH', help="Output file (default: standard output)")
              self._parser.add_argument('--source', '-s', type=argparse.FileType('r'),
                                        required=True, metavar='PATH', help="Source text file")
  
  
  class ScorerSettings(ScorerBaseSettings):
      """
      Console interface for scoring (score.py)
      """
      def _add_console_arguments(self):
          super(ScorerSettings, self)._add_console_arguments()
          if self._from_console_arguments:
              self._parser.add_argument('--target', '-t', type=argparse.FileType('r'),
                                        required=True, metavar='PATH', help="Target text file")
  
  
  class RescorerSettings(ScorerBaseSettings):
      """
      Console interface for rescoring (rescore.py)
      """
      def _add_console_arguments(self):
          super(RescorerSettings, self)._add_console_arguments()
          if self._from_console_arguments:
              self._parser.add_argument('--input', '-i', type=argparse.FileType('r'),
                                        default=sys.stdin, metavar='PATH', help="Input n-best list file (default: standard input)")
  