Co-occurrence Heatmap

>>> from techminer2.co_occurrence_matrix import co_occurrence_heatmap
>>> co_occurrence_heatmap(
...     #
...     # FUNCTION PARAMS:
...     columns='author_keywords',
...     rows='authors',
...     retain_counters=True,
...     #
...     # COLUMN PARAMS:
...     col_top_n=None,
...     col_occ_range=(2, None),
...     col_gc_range=(None, None),
...     col_custom_terms=None,
...     #
...     # ROW PARAMS:
...     row_top_n=None,
...     row_occ_range=(2, None),
...     row_gc_range=(None, None),
...     row_custom_terms=None,
...     #
...     # DATABASE PARAMS:
...     root_dir="example/",
...     database="main",
...     year_filter=(None, None),
...     cited_by_filter=(None, None),
... ) 
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