Makoto YUI

We got the following TypeError for force_plot at [this line](https://github.com/slundberg/shap/blob/v0.41.0/shap/plots/_force_matplotlib.py#L117) `' = ' + feature[1]`. feature[1] comes from https://github.com/slundberg/shap/blob/v0.41.0/shap/plots/_force_matplotlib.py#L210 it comes from https://github.com/slundberg/shap/blob/510c4b6a85e4189573ef8290392139586c4292f5/shap/plots/_force.py#L401 and can be non-str object https://github.com/slundberg/shap/blob/510c4b6a85e4189573ef8290392139586c4292f5/shap/plots/_force.py#L308 This...

This PR fixes the following TypeError. ``` TypeError Traceback (most recent call last) Input In [84], in () 6 try: 7 shap.force_plot(expected_value1, shap_value1[rowid], X.iloc[rowid], matplotlib=True) ----> 8 shap.plots.waterfall(shap_obj[rowid]) 9 except...

This PR introduces System Tests of Hivemall. Usage and example are written in `systemtest/README.md` . This PR is based on [a pending PR](https://github.com/myui/hivemall/pull/336) by @amaya382 that is sent before Hivemall...

Learning rate increases?

7

I have a question about the following part of the paper:  In the dot product, `∇f(θ_{t-1})・∇f(θ_{t-2})`, `sign(∇f(θ_{t-1}))` and `sign(∇f(θ_{t-2}))` often be same for [sign](https://en.wikipedia.org/wiki/Sign_function). Then, learning rate `α_{t}` would...