April 2020
Intermediate to advanced
344 pages
8h 22m
Japanese
Content preview from Pythonではじめる教師なし学習 ―機械学習の可能性を広げるラベルなしデータの利用
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6.5
HDBSCAN
の適用
155
22 0.317979
23 0.308771
24 0.284314
25 0.243243
26 0.500000
27 0.289157
28 0.365283
29 0.479693
30 0.393559
31 0.340875
6.5
HDBSCAN
の適用
次に、クラスタリングアルゴリズムとして
HDBSCAN
を用いて、
LendingClub
データの借入者をグ
ループ分けしてみよう。
HDBSCAN
は、借入者の高次元空間の属性値の近傍性に基づいてグループ分けを行う。
k
平均法や
階層クラスタリングと異なり、すべての借入者がグループに分けられるわけではない。どの借入者グ
ループからもかけ離れた借入者はグループに入れられない。このような外れ値の借入者は、他の借入
者と何が異なっているのか、それにはビジネス上の理由があるのかを調べてみる価値があるかもしれ
ない。一部のグループに属する借入者については自動的にローングレードを決めてもいいが、何にも似
ていないような借入者に関しては、もう少し丁寧なスコア付けが必要だろう。
HDBSCAN
の結果を見てみよう。
import hdbscan
min_cluster_size = 20
min_samples = 20
alpha = 1.0
cluster_selection_method = 'leaf'
hdb = hdbscan.HDBSCAN(min_cluster_size=min_cluster_size, \
min_samples=min_samples, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.