ImageDataGeneratorを使ってデータを追加した結果です
Epoch 35/40
312/312 [==============================] - 46s 148ms/step - loss: 0.8052 - acc: 0.7320 - val_loss: 0.8116 - val_acc: 0.7325
Epoch 36/40
312/312 [==============================] - 46s 148ms/step - loss: 0.8102 - acc: 0.7306 - val_loss: 0.6771 - val_acc: 0.7729
Epoch 37/40
312/312 [==============================] - 47s 150ms/step - loss: 0.8019 - acc: 0.7341 - val_loss: 0.8714 - val_acc: 0.7364
Epoch 38/40
312/312 [==============================] - 46s 149ms/step - loss: 0.8111 - acc: 0.7329 - val_loss: 0.7277 - val_acc: 0.7655
Epoch 39/40
312/312 [==============================] - 46s 148ms/step - loss: 0.8187 - acc: 0.7282 - val_loss: 0.6686 - val_acc: 0.7857
Epoch 40/40
312/312 [==============================] - 47s 149ms/step - loss: 0.8201 - acc: 0.7325 - val_loss: 0.7132 - val_acc: 0.7658
Test loss: 0.7209065488338471
Test accuracy: 0.7693
あまり結果が伸びませんでした