Created
March 10, 2019 17:08
-
-
Save SHi-ON/63839f3a3647051a180cb03af0f7d0d9 to your computer and use it in GitHub Desktop.
An expirement to show how stratify option works
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# Experiment to confirm the effect of stratify option in Scikit Learn, tran_test_split() method. | |
# by Shayan Amani | |
from sklearn.model_selection import train_test_split | |
import pandas as pd | |
raw_data = pd.read_csv("codebase/adrel/dataset/train.csv") | |
cnt = raw_data.groupby('label').count() | |
''' experiment begins ''' | |
''' Part One: stratify is ON ''' | |
train, validate = train_test_split(raw_data, test_size=0.1, random_state=seed, stratify=raw_data['label']) | |
tr = train.groupby('label').count() | |
for i in range(9): | |
ratio = tr.iloc[i][0] / cnt.iloc[i][0] | |
print(ratio) | |
# assert that all train label classes has 90% of raw data | |
assert 0.89 < ratio < 0.91, 'Ratio is not following the rules {}'.format(i) | |
''' Output: | |
0.9000484027105518 | |
0.9000853970964987 | |
0.8999281781182668 | |
0.9000229832222477 | |
0.900049115913556 | |
0.8998682476943346 | |
0.8999274836838289 | |
0.9000227221086117 | |
0.9000738370662072 | |
''' | |
''' Part Two: stratify is OFF''' | |
train, validate = train_test_split(raw_data, test_size=0.1, random_state=seed) | |
tr = train.groupby('label').count() | |
for i in range(9): | |
ratio = tr.iloc[i][0] / cnt.iloc[i][0] | |
print(ratio) | |
assert 0.89 < ratio < 0.91, 'Ratio is not following the rules {}'.format(i) | |
''' Output: | |
0.9010164569215876 | |
0.8936806148590948 | |
0.8889154895858271 | |
Traceback (most recent call last): | |
File "/home/shi-on/anaconda3/envs/PyON36/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 3267, in run_code | |
exec(code_obj, self.user_global_ns, self.user_ns) | |
File "<ipython-input-115-5835d3554147>", line 4, in <module> | |
assert 0.89 < ratio < 0.91, 'Ratio is not following the rules {}'.format(i) | |
AssertionError: Ratio is not following the rules 2 | |
''' |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
me also having same error