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[docs] Add alt text to image in Parameters-Tuning.rst #4035

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1 change: 1 addition & 0 deletions docs/Parameters-Tuning.rst
Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,7 @@ LightGBM adds nodes to trees based on the gain from adding that node, regardless

.. image:: ./_static/images/leaf-wise.png
:align: center
:alt: Three consecutive images of decision trees, where each shows the tree with an additional two leaf nodes added. Shows that leaf-wise growth can result in trees that have some branches which are longer than others.

Because of this growth strategy, it isn't straightforward to use ``max_depth`` alone to limit the complexity of trees. The ``num_leaves`` parameter sets the maximum number of nodes per tree. Decrease ``num_leaves`` to reduce training time.

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