parameters: (text, tokenizer, stopword_list, is_lower_case=False)
return_statement: return filtered_text
docstring: lambda fn for removing stopwrods
docstring_summary: lambda fn for removing stopwrods
docstring_tokens: lambda fn for removing stopwrods
function: def remove_stopwords(text, tokenizer, stopword_list, is_lower_case=False):
      ''' lambda fn for removing stopwrods '''
      tokens = tokenizer.tokenize(text)
      tokens = [token.strip() for token in tokens]
      if is_lower_case:
          filtered_tokens = [
              token for token in tokens if token not in stopword_list
          ]
      else:
          filtered_tokens = [
              token for token in tokens if token.lower() not in stopword_list
          ]
      filtered_text = ' '.join(filtered_tokens)
      return filtered_text
function_tokens: def remove_stopwords ( text , tokenizer , stopword_list , is_lower_case = False ) : tokens = tokenizer . tokenize ( text ) tokens = [ token . strip ( ) for token in tokens ] if is_lower_case : filtered_tokens = [ token for token in tokens if token not in stopword_list ] else : filtered_tokens = [ token for token in tokens if token . lower ( ) not in stopword_list ] filtered_text = ' ' . join ( filtered_tokens ) return filtered_text