What does the value of 'leaf' in the following xgboost model tree diagram means?
<p><a href="https://i.stack.imgur.com/L1N2K.png" rel="noreferrer"><img src="https://i.stack.imgur.com/L1N2K.png" alt="enter image description here"></a></p>

<p>I am guessing that it is conditional probability given that the above (tree branch) condition exists. However, I am not clear on it.</p>

<p>If you want to read more about the  data used or how do we get this diagram then go to : <a href="http://machinelearningmastery.com/visualize-gradient-boosting-decision-trees-xgboost-python/" rel="noreferrer">http://machinelearningmastery.com/visualize-gradient-boosting-decision-trees-xgboost-python/</a></p>