UnrecognizedFlagError: Unknown command line flag 'f'

[emnajaoua]

When I am trying to run the main file in my jupyter notebook. I face this error of unknown flag for gamma althought the gamma flag was defined previously from tf.app.flags.

The error is represented here

---

UnrecognizedFlagError Traceback (most recent call last)
in ()
----> 1 print(flags.gamma)

/opt/aiml4it/anaconda/3-5.2.0-generic/lib/python3.6/site-packages/tensorflow/python/platform/flags.py in getattr(self, name)
82 # a flag.
83 if not wrapped.is_parsed():
---> 84 wrapped(_sys.argv)
85 return wrapped.getattr(name)
86

/opt/aiml4it/anaconda/3-5.2.0-generic/lib/python3.6/site-packages/absl/flags/_flagvalues.py in call(self, argv, known_only)
628 suggestions = _helpers.get_flag_suggestions(name, list(self))
629 raise _exceptions.UnrecognizedFlagError(
--> 630 name, value, suggestions=suggestions)
631
632 self.mark_as_parsed()

UnrecognizedFlagError: Unknown command line flag 'f'

Any idea why I get this error. I searched in SO but nothing helpful so far