'bias': 1.0,
'word.lower()': word.lower(),
#'word.lemma()':lemmatizer(word, postag),
'word[-3:]': word[-3:],
'word[-2:]': word[-2:],
'word.isupper()': word.isupper(),
'word.istitle()': word.istitle(),
'word.isdigit()': word.isdigit(),
'postag': postag,
'postag[:2]': postag[:2],
these features i have considered.