code: def portfolio_from_dict(self, portfolio_data):
      from catalyst.protocol import Portfolio
  
      return Portfolio()
  
file_path: catalyst/catalyst/exchange/utils/serialization_utils.py
imports: import json
  import re
  from json import JSONEncoder
  import pandas
  from catalyst.constants import DATE_TIME_FORMAT
  from six import string_types
label_desc: Use image node_id 2 for calling a global function with example usage: portfolio_from_dict(portfolio_data) and returns: Portfolio