Terms to Cluster Mapping

>>> # where_records_ordered_by: date_newest, date_oldest, global_cited_by_highest,
>>> #                           global_cited_by_lowest, local_cited_by_highest,
>>> #                           local_cited_by_lowest, first_author_a_to_z,
>>> #                           first_author_z_to_a, source_title_a_to_z,
>>> #                           source_title_z_to_a
>>> from techminer2.packages.networks.co_occurrence.keywords import DocumentsByClusterMapping
>>> documents_by_cluster = (
...     DocumentsByClusterMapping()
...     #
...     # FIELD:
...     .having_terms_in_top(20)
...     .having_terms_ordered_by("OCC")
...     .having_term_occurrences_between(None, None)
...     .having_term_citations_between(None, None)
...     .having_terms_in(None)
...     #
...     # NETWORK:
...     .using_clustering_algorithm_or_dict("louvain")
...     .using_association_index("association")
...     #
...     # DATABASE:
...     .where_root_directory_is("example/")
...     .where_database_is("main")
...     .where_record_years_range_is(None, None)
...     .where_record_citations_range_is(None, None)
...     .where_records_match(None)
...     .where_records_ordered_by("date_newest")
...     #
...     .run()
... )
>>> print(len(documents_by_cluster))
3
>>> print(documents_by_cluster[0][0])
UT 1251
AR Haddad C., 2019, SMALL BUS ECON, V53, P81
TI The emergence of the global fintech market: economic and technological
   determinants
AU Haddad C.; Hornuf L.
TC 258
SO Small Business Economics
PY 2019
AB we investigate THE_ECONOMIC_AND_TECHNOLOGICAL_DETERMINANTS inducing
   ENTREPRENEURS to establish VENTURES with THE_PURPOSE of reinventing
   FINANCIAL_TECHNOLOGY ( FINTECH ) . we find that COUNTRIES witness
   MORE_FINTECH startup FORMATIONS when THE_ECONOMY is
   WELL_DEVELOPED_AND_VENTURE_CAPITAL is readily available . furthermore ,
   THE_NUMBER of SECURE_INTERNET_SERVERS , MOBILE_TELEPHONE_SUBSCRIPTIONS , and
   THE_AVAILABLE_LABOR_FORCE has A_POSITIVE_IMPACT on THE_DEVELOPMENT of
   THIS_NEW_MARKET_SEGMENT . finally , the more difficult it is for COMPANIES
   to ACCESS_LOANS , the higher is THE_NUMBER of FINTECH_STARTUPS in A_COUNTRY
   . overall , THE_EVIDENCE suggests that FINTECH_STARTUP_FORMATION_NEED not be
   left to CHANCE , but ACTIVE_POLICIES can INFLUENCE THE_EMERGENCE of
   THIS_NEW_SECTOR . 2018 , the author ( s ) .
DE ENTREPRENEURSHIP; FINANCIAL_INSTITUTIONS; FINTECH; STARTUPS