Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Confusion matrix
Search
Sunmi Yoon
November 03, 2019
Technology
0
150
Confusion matrix
Confusion matrix 기초부터 머신러닝 응용까지 for dataitgirls3
Sunmi Yoon
November 03, 2019
Tweet
Share
More Decks by Sunmi Yoon
See All by Sunmi Yoon
데이터 분석가 채용 공고 읽는 방법
ysunmi0427
1
350
Deep down in classification 0.5 magic number
ysunmi0427
0
96
Tree Methods
ysunmi0427
0
130
심슨의 역설
ysunmi0427
0
2.3k
회사는 어떤 사람을 데이터 분석가로 채용하고 싶어하는 것일까?
ysunmi0427
0
2.4k
Other Decks in Technology
See All in Technology
初めてのDatabricks Apps開発
taka_aki
1
370
OSSで50の競合と戦うためにやったこと
yamadashy
3
970
事業開発におけるDify活用事例
kentarofujii
5
1.4k
Wasmの気になる最新情報
askua
0
190
アウトプットから始めるOSSコントリビューション 〜eslint-plugin-vueの場合〜 #vuefes
bengo4com
3
1.8k
ストレージエンジニアの仕事と、近年の計算機について / 第58回 情報科学若手の会
pfn
PRO
3
820
頭部ふわふわ浄酔器
uyupun
0
110
会社を支える Pythonという言語戦略 ~なぜPythonを主要言語にしているのか?~
curekoshimizu
3
660
Biz職でもDifyでできる! 「触らないAIワークフロー」を実現する方法
igarashikana
7
3.3k
Dify on AWS 環境構築手順
yosse95ai
0
120
Azureコストと向き合った、4年半のリアル / Four and a half years of dealing with Azure costs
aeonpeople
1
280
ヘンリー会社紹介資料(エンジニア向け) / company deck for engineer
henryofficial
0
370
Featured
See All Featured
For a Future-Friendly Web
brad_frost
180
10k
Git: the NoSQL Database
bkeepers
PRO
431
66k
Building Adaptive Systems
keathley
44
2.8k
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
116
20k
Keith and Marios Guide to Fast Websites
keithpitt
411
23k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
Making the Leap to Tech Lead
cromwellryan
135
9.6k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
10
890
KATA
mclloyd
PRO
32
15k
The Straight Up "How To Draw Better" Workshop
denniskardys
238
140k
Being A Developer After 40
akosma
91
590k
Visualization
eitanlees
149
16k
Transcript
Evaluation for classification dataitgirls3 Instructor Sunmi Yoon
Confusion Matrix
https://sumniya.tistory.com/26
Evaluation Metrics from Confusion Matrix
https://towardsdatascience.com/understanding-confusion-matrix-a9ad42dcfd62
Precision(ب), PPV(Positive Predictive Value) ݽ؛ TrueۄҊ ࠙ܨೠ Ѫ ী, पઁ
Trueੋ Ѫ ࠺ਯ Recall(അਯ), Sensitivity, hit rate पઁ True ী ݽ؛ True۽ ࠙ܨೠ ࠺ਯ “Precision݅ न҃ਸ ॳݶ ݽ؛ ੋ࢝೧Ҋ, Recall݅ न҃ॳݶ ݽ؛ ಌ” ܳ ࢤп೧ࠁࣁਃ.
Accuracy TP, TNਸ ݽف Ҋ۰ೞח . Label ࠛӐഋ बೡ ٸী
ࢎਊਸ ೧ঠ פ. F1 Score Precisionҗ Recall ઑചಣӐ Label ࠛӐഋ बೡ ٸী ݽ؛ ࢿמਸ ഛೞѱ ಣоೡ ࣻ णפ. Label ࠛӐഋ बೡ ٸী, Accuracyח ۽ࢲ न܉ࢿਸ णפ. ਬܳ ࢤп ೧ ࠁࣁਃ.
https://sumniya.tistory.com/26 ৵ ࣿಣӐ ইפҊ ઑചಣӐੋо?
ઑӘ݅ ؊ о ࠇद
https://towardsdatascience.com/understanding-confusion-matrix-a9ad42dcfd62 द Ӓܿਵ۽ جই৬ࢲ, ଘ ফܳ बਵ۽ ࢤп೮
https://towardsdatascience.com/understanding-confusion-matrix-a9ad42dcfd62 द Ӓܿਵ۽ جই৬ࢲ, ߣূ ফب э ࢤпೞݶࢲ ࠇद
(Әࠗఠ ഁтܾ ࣻ )
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
Precision Positive Predictive Value ࠙ܨ Ѿҗ(ݽ؛)ਸ बਵ۽
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
Negative Predictive Value ࠙ܨ Ѿҗ(ݽ؛)ਸ बਵ۽
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
Recall Sensitivity True Positive Rate ਸ बਵ۽
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
ਸ बਵ۽ False Positive Rate
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
ਸ बਵ۽ Specificity True Negative Rate
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
ਸ बਵ۽ Fall-out rate False Positive Rate
https://towardsdatascience.com/understanding-confusion-matrix-a9ad42dcfd62 Ѧ ೞҊ ೮ભ. ߣূ ফب э ࢤпೞݶࢲ ࠇद (Әࠗఠ
ഁтܾ ࣻ )
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
? TP ब ٜ ܻೞݶ, ?
TRUE FALSE ࠙ܨѾҗ TRUE TP FP FALSE FN TN
TN ब ٜ ? ܻೞݶ, ?
ഁтܻભ? ਗې Ӓ۠Ѣਃ
ӝୡח ೮ਵפө ઑӘ݅ ؊ ೧ ࠇद.
Confusion Matrix with Histogram
https://www.medcalc.org/manual/roc-curves.php Criterion, Threshold য়ܲଃ Distribution Actual True, ৽ଃ Actual False.
Threshold ਤ۽ח ݽف True۽ ஏೞח ݽ؛ Ҋ о೮ਸ ٸ,
https://www.medcalc.org/manual/roc-curves.php Thresholdܳ ӓױਵ۽ ஏ ز दெࠇद. যڃ ੌ ੌযաաਃ? Precision:
Recall: Specificity: Fall-out:
https://www.medcalc.org/manual/roc-curves.php Thresholdܳ ӓױਵ۽ ஏ ز दெࠇद. যڃ ੌ ੌযաաਃ? True
positive rate: True negative rate:
https://www.medcalc.org/manual/roc-curves.php ߣূ ߈۽ ز दெࠇद. যڃ ੌ ੌযաաਃ? True positive
rate: True negative rate:
Specificity৬ Sensitivity ҙ҅ https://www.medcalc.org/manual/roc-curves.php
ROC(Receiver Operating Characteristic) curve
рױೞѱח, Sensitivity৬ 1-Specificityܳ п ୷ਵ۽ ೞח 2ରਗ Ӓې https://www.medcalc.org/manual/roc-curves.php AUC
(Area Under Curve)
рױೞѱח, Sensitivity৬ 1-Specificityܳ п ୷ਵ۽ ೞח 2ରਗ Ӓې https://www.medcalc.org/manual/roc-curves.php Actual
True৬ Actual False distribution ৮߷ೞѱ эਸ ٸ (feature class ߸߹מ۱ হ) ROC curveח 45ب пب ࢶ
рױೞѱח, Sensitivity৬ 1-Specificityܳ п ୷ਵ۽ ೞח 2ରਗ Ӓې https://www.medcalc.org/manual/roc-curves.php Actual
True৬ Actual False distribution Ҁח হ ৮߷ೞѱ ܻ࠙ ؼ ٸ ROC ழ࠳ (feature class ߸߹ מ۱ ৮߷) ROC ழ࠳о ઝ࢚ױী оөࣻ۾ feature class ߸߹ מ۱ જҊ ೡ ࣻ .
ROC(Receiver Operating Characteristic) curve with Machine Learning
Classifierܳ ݅ٚח Ѥ, ف ѐ histogramਸ ӒܻҊ Thresholdܳ ೞח Ѫ
https://www.medcalc.org/manual/roc-curves.php
https://scikit-learn.org/stable/auto_examples/model_selection/plot_roc.html#sphx-glr-auto-examples-model-selection-plot-roc-py Histogramਸ Ӓ۷ח Ѥ ROC ழ࠳ܳ Ӓܾ ࣻ ח Ѫ!
https://scikit-learn.org/stable/auto_examples/model_selection/plot_roc.html#sphx-glr-auto-examples-model-selection-plot-roc-py ROC ழ࠳ܳ Ӓܾ ࣻ ח Ѥ ৈ۞ ROC ழ࠳
р ࠺Үܳ ా೧ જ ࢿמ ݽ؛ਸ ইյ ࣻ ח Ѫ!
AUCо = ݽ؛ ҅ೠ probabilityܳ ߄ఔਵ۽ Ӓܽ histogramٜ ੜ
ܻ࠙غয . = ݽ؛ Threshold(Decision BoundaryۄҊب ೠ)ী ؏ хೞ. = উੋ ஏਸ ೠ.
ݽ؛ ࢶఖী ROC ழ࠳ܳ ഝਊೠ = Decision Boundaryী ࢚ҙহ ؊
જ ݽ؛ਸ ח. = ganziо դ.
Ӓ۰ࠇद. ؘఠ: titanic ݽ؛ - sklearn.linear_model.LinearRegression - sklearn.linear_model.LogisticRegression -
sklearn.tree.DecisionTreeClassifier - sklearn.ensemble.RandomForestClassifier ١ whatever you want - Tree ҅ৌ ݽ؛ ҃ model predict_proba() ݫࣗ٘ܳ ࢎਊೞݶ ഛܫ ҅ ؾ פ. - ীח Thresholdܳ a ݅ఀ ز೧оݴ Sensitivity, Specificityܳ ҅೧ ઝܳ ҳೞ ࣁਃ. - যڌѱ ೞݶ Thresholdܳ ੜ زदఃݶࢲ ROC ઝܳ ନਸ ࣻ ਸөਃ? - ઝٜਸ ಣݶ࢚ী ନযࠁࣁਃ.
sklearn.metrics.roc_curve ܳ ഝਊ ೧ ࠇद. ؘఠ: titanic ݽ؛ - sklearn.linear_model.LinearRegression
- sklearn.linear_model.LogisticRegression - sklearn.tree.DecisionTreeClassifier - sklearn.ensemble.RandomForestClassifier ١ whatever you want ؊ աইоࢲ, - sklearnਸ ਊ೧ AUCب ҅ ೧ࠇद. - ৈ۞ ݽ؛ٜ ࢿמਸ ࠺Ү ೧ ࠇद. - DecisionTreeClassifierܳ ࢎਊ೮؊ۄب, ࢎਊೠ featureо ܰݶ ӒѤ ܲ ݽ؛ੑפ . - ఋఋץ ݈Ҋ, ܲ classification ޙઁীب ഝਊ೧ ࠁࣁਃ.