Bubble Chart

>>> from techminer2.report import bubble_chart
>>> chart = bubble_chart(
...     #
...     # COLUMN PARAMS:
...     columns='author_keywords',
...     col_top_n=10,
...     col_occ_range=(None, None),
...     col_gc_range=(None, None),
...     col_custom_terms=None,
...     #
...     # ROW PARAMS:
...     rows=None,
...     row_top_n=None,
...     row_occ_range=(None, None),
...     row_gc_range=(None, None),
...     row_custom_terms=None,
...     #
...     # CHART PARAMS:
...     title=None,
...     #
...     # DATABASE PARAMS:
...     root_dir="example/",
...     database="main",
...     year_filter=(None, None),
...     cited_by_filter=(None, None),
... )
>>> # chart.write_html("sphinx/_static/report/bubble_chart.html")