Orientalists are logistic regression and Westerners are decision trees.

https://gyazo.com/65041f75b35b16a9903a8525291966c5

Should the target in the figure be in group 1 or group 2?

Orientals tend to choose Group 1 and Westerners Group 2.

Represent petal, inflorescence, leaf, and stem features as (1, 1, 1, 1) targets

Group 1

(1, 1, 1, 0)

(1, 0, 1, 0)

(1, 1, 0, 0)

(0, 1, 1, 0)

Group 2

(0, 0, 1, 1)

(0, 0, 0, 1)

(0, 1, 0, 1)

(1, 0, 0, 1)

Let us call the axes (a, b, c, d), respectively

Western identification discards information other than the d-axis to identify

Oriental-type identification uses all axes.

code:python

import numpy as np

from sklearn.linear_model import LogisticRegression

X = np.array([

(1, 1, 1, 0),

(1, 0, 1, 0),

(1, 1, 0, 0),

(0, 1, 1, 0),

(0, 0, 1, 1),

(0, 0, 0, 1),

(0, 1, 0, 1),

(1, 0, 0, 1)])

m = LogisticRegression()

m.fit(X, Y)

code::

coef_ shows -0.48 (weakly suggesting group 1) with respect to the a, b, and c axes, and +1.17 (strongly suggesting group 2) with respect to the d axis.

Logistic regression adds them together, so the decision on the axes a, b, and c wins and makes the decision that the group is group 1 by a narrow margin.

code:python

from sklearn.tree import DecisionTreeClassifier

m = DecisionTreeClassifier()

m.fit(X, Y)

code::

The reason is simple: the learning process looks for "which of the axes is the most neatly divisible" and naturally leads to the conclusion that "d is the best way to make a decision". In the identification phase, no axis other than d is looked at.

2025-06-17

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