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'''

Created on Jul 8, 2016 grid_search.py

Grid search does a brute force train and test of sample data, trying

a grid of parameters.

The SVM attempts to maximize the margin of error between linearly

separable feature sets.

from Python Machine Learning by Sebastian Raschka under the following license

The MIT License (MIT)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

@author: richard lyman

'''

import ocr_utils

from sklearn.preprocessing import StandardScaler

from sklearn.pipeline import Pipeline

from sklearn.model_selection import GridSearchCV

from sklearn.svm import SVC

if __name__ == '__main__':

y_train, X_train, y_test, X_test, labels = ocr_utils.load_E13B(chars_to_train = (48,51) , test_size=0.3, columns=(9,17), random_state=0)

pipe_svc = Pipeline([('scl', StandardScaler()),

('clf', SVC(random_state=1))])

param_range = [0.0001, 0.001, 0.01, 0.1, 1.0, 10.0, 100.0, 1000.0]

param_grid = [{'clf__C': param_range,

'clf__kernel': ['linear']},

{'clf__C': param_range,

'clf__gamma': param_range,

'clf__kernel': ['rbf']}]

gs = GridSearchCV(estimator=pipe_svc,

param_grid=param_grid,

scoring='accuracy',

cv=10,

n_jobs=-1)

gs = gs.fit(X_train, y_train)

print('Support Vector Machine Grid Search best score: {}'.format(gs.best_score_))

print('Support Vector Machine Grid Search best params: {}'.format(sorted(gs.best_params_.items())))

clf = gs.best_estimator_

clf.fit(X_train, y_train)

print('Support Vector Machine Test accuracy: %.3f' % clf.score(X_test, y_test))

print ('\n########################### No Errors ####################################')