def init_parameters():
    """
	Initialize parameters
	"""
    global params
    params = dict()
    params['core'] = dict()
    params['ontology'] = dict()
    params['ac'] = dict()
    params['query'] = dict()
    params['ss'] = dict()
    params['stats'] = dict()
    params['output'] = dict()
    params['core']['program_dir'] = None
    params['core']['load_params'] = None
    params['core']['save_params'] = None
    params['core']['verbose'] = 1
    params['core']['inject_IC'] = None
    params['core']['task'] = None
    params['ontology']['ontology_file'] = None
    params['ontology']['ontology_type'] = None
    params['ontology']['ontology_file_format'] = None
    params['ontology']['ignore'] = list()
    params['ac']['ac'] = None
    params['ac']['ac_type'] = None
    params['ac']['ac_species'] = 'human'
    params['ac']['ac_file'] = None
    params['ac']['EC_include'] = list()
    params['ac']['EC_ignore'] = list()
    params['ac']['tax_include'] = list()
    params['ac']['tax_ignore'] = list()
    params['ac']['ac_multiple'] = None
    params['ac']['ac_separator'] = None
    params['ac']['ac_term_first'] = None
    params['query']['query_ss_type'] = None
    params['query']['query_mode'] = None
    params['query']['query_input'] = None
    params['query']['query_file_sep'] = '\t'
    params['query']['query_file'] = None
    params['ss']['ss_root'] = None
    params['ss']['use_enhanced'] = None
    params['ss']['tss_measure'] = None
    params['ss']['tss_mix'] = None
    params['output']['cut_thres'] = None
    params['output']['out_file'] = None
    params['output']['out_mode'] = 'console'
    params['output']['cut_nan'] = None
    params['stats']['IC'] = None
    return params
