readme is not clear about the usage

[reachlin]

i was trying to run some simple test on rnn, but the usage is too confusing. i tried the sample command in the README and got the error:

root@e57eeea7640c:~/tfrnnlm# echo 'abc efg' > text.txt
root@e57eeea7640c:~/tfrnnlm# tfrnnlm train text.txt model
Traceback (most recent call last):
  File "/usr/local/bin/tfrnnlm", line 11, in <module>
    load_entry_point('tfrnnlm==1.0.0', 'console_scripts', 'tfrnnlm')()
  File "build/bdist.linux-x86_64/egg/tfrnnlm/main.py", line 17, in main
  File "/usr/lib/python2.7/argparse.py", line 1701, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "/usr/lib/python2.7/argparse.py", line 1733, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib/python2.7/argparse.py", line 1942, in _parse_known_args
    stop_index = consume_positionals(start_index)
  File "/usr/lib/python2.7/argparse.py", line 1898, in consume_positionals
    take_action(action, args)
  File "/usr/lib/python2.7/argparse.py", line 1807, in take_action
    action(self, namespace, argument_values, option_string)
  File "/usr/lib/python2.7/argparse.py", line 1096, in __call__
    subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
  File "/usr/lib/python2.7/argparse.py", line 1733, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "/usr/lib/python2.7/argparse.py", line 1942, in _parse_known_args
    stop_index = consume_positionals(start_index)
  File "/usr/lib/python2.7/argparse.py", line 1898, in consume_positionals
    take_action(action, args)
  File "/usr/lib/python2.7/argparse.py", line 1791, in take_action
    argument_values = self._get_values(action, argument_strings)
  File "/usr/lib/python2.7/argparse.py", line 2231, in _get_values
    value = self._get_value(action, arg_string)
  File "/usr/lib/python2.7/argparse.py", line 2260, in _get_value
    result = type_func(arg_string)
  File "build/bdist.linux-x86_64/egg/tfrnnlm/text.py", line 254, in deserialize
IOError: [Errno 20] Not a directory: 'text.txt/vocabulary.pkl'
root@e57eeea7640c:~/tfrnnlm#