Allow model selection between linear and convolutional

driver.py

src/models.py

src/utils_data.py

src/utils_results.py

src/utils_training.py

...shion-mnist_features-distribution-skew_8_100_3_5_5_42.csv

...shion-mnist_features-distribution-skew_8_100_3_5_5_42.csv

...shion-mnist_features-distribution-skew_8_100_3_5_5_42.csv

...shion-mnist_features-distribution-skew_8_100_3_5_5_42.csv

tests/test_utils_training.py