1.6.1
FIX Uses log2 in tree building (#30557)
MNT Add author/license note where missing and add the linter (#29477)
FIX Check and correct the input_tags.sparse flag (#30187)
CLN replace authors with the standard line (#29250)
FIX escape double quotes when exporting tree with Graphviz (#17575)
MAINT Pull apart Splitter and Partitioner in the sklearn/tree code (#29458)
FEA Add `_build_pruned_tree` to tree.pxd file to allow cimports and a `_build_pruned_tree_py` to allow anyone to prune trees (#29590)
MNT convert `unsigned char` to `uint8_t` (#29510)