Last active
April 21, 2018 18:25
-
-
Save lbourbon/f185294f635d65644468f6accb980614 to your computer and use it in GitHub Desktop.
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
{ | |
"cells": [ | |
{ | |
"cell_type": "code", | |
"execution_count": 1, | |
"metadata": { | |
"collapsed": false | |
}, | |
"outputs": [], | |
"source": [ | |
"# importar a biblioteca\n", | |
" \n", | |
"from sklearn.naive_bayes import GaussianNB\n", | |
"\n", | |
"\n", | |
"# instanciar um objeto e aplicar o método fit para treinar os dados\n", | |
" \n", | |
"modelo = GaussianNB()\n", | |
"modelo.fit ( X_train, y_train)\n", | |
"\n", | |
"\n", | |
"# fazer a previsão para um nova amostra de dados não treinada\n", | |
" \n", | |
"prev = model.predict (X_test)" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"### Exemplo:" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 2, | |
"metadata": { | |
"collapsed": false | |
}, | |
"outputs": [], | |
"source": [ | |
"import numpy as np" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"#### Criamos um pequeno dataset com 6 amostras, cada uma contendo dois atributos" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 3, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"X = np.array([[-1, -1], [-2, -1], [-3, -2], [1, 1], [2, 1], [3, 2]])" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"#### Para cada amostra criamos uma etiqueta (label) correspondente a sua classificaçãoque, nesse caso, podem pertencer a classe 1 ou classe 2" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 4, | |
"metadata": { | |
"collapsed": true | |
}, | |
"outputs": [], | |
"source": [ | |
"Y = np.array(['classe 1','classe 1','classe 1',' classe 2','classe 2','classe 2'])" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"#### Aplicamos o algoritmo" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 5, | |
"metadata": { | |
"collapsed": false | |
}, | |
"outputs": [ | |
{ | |
"data": { | |
"text/plain": [ | |
"GaussianNB(priors=None)" | |
] | |
}, | |
"execution_count": 5, | |
"metadata": {}, | |
"output_type": "execute_result" | |
} | |
], | |
"source": [ | |
"from sklearn.naive_bayes import GaussianNB\n", | |
"\n", | |
"clf = GaussianNB()\n", | |
"clf.fit(X, Y)\n", | |
"\n", | |
"GaussianNB(priors=None)" | |
] | |
}, | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"#### Tentamos prever a classificação de uma nova amostra, ainda não 'vista' pelo algoritmo" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 7, | |
"metadata": { | |
"collapsed": false | |
}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"['classe 1']\n" | |
] | |
} | |
], | |
"source": [ | |
"print(clf.predict([[-0.8, -0.5]]))" | |
] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python [conda env:k35]", | |
"language": "python", | |
"name": "conda-env-k35-py" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.5.2" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 1 | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment