Load knowledgebase from zipped json file of pd.DataFrame


Instead of using tsv file, we can use pickle file (which was per-generated from pd.DataFrame) to load the results into AI. This way is very fast because no `eval` process is needed for converting parameters into python dictionary. The dictionary format can be pickled within pd.DataFrame.

But there is one issue about using pickle on regression knowledgebase: the pickle file is over 200Mb due to its large amounts of results while classification's knowledgebase is only 8Mb.